diff --git a/build.gradle b/build.gradle
index 0e134f76..be81e690 100644
--- a/build.gradle
+++ b/build.gradle
@@ -104,7 +104,7 @@ subprojects { subproject ->
 		rabbitmqHttpClientVersion = '1.1.1.RELEASE'
 		slf4jVersion = "1.7.25"
 
-		springVersion = project.hasProperty('springVersion') ? project.springVersion : '4.3.22.RELEASE'
+		springVersion = project.hasProperty('springVersion') ? project.springVersion : '4.3.23.BUILD-SNAPSHOT'
 
 		springRetryVersion = '1.2.2.RELEASE'
 	}
diff --git a/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/Jackson2JsonMessageConverterTests-context.xml b/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/Jackson2JsonMessageConverterTests-context.xml
index eb1ab52b..1d084b66 100644
--- a/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/Jackson2JsonMessageConverterTests-context.xml
+++ b/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/Jackson2JsonMessageConverterTests-context.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="jsonConverterWithDefaultType" class="org.springframework.amqp.support.converter.Jackson2JsonMessageConverter">
 		<property name="classMapper">
diff --git a/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/JsonMessageConverterTests-context.xml b/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/JsonMessageConverterTests-context.xml
index 1c8c3263..84772b03 100644
--- a/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/JsonMessageConverterTests-context.xml
+++ b/spring-amqp/src/test/resources/org/springframework/amqp/support/converter/JsonMessageConverterTests-context.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="jsonConverterWithDefaultType" class="org.springframework.amqp.support.converter.JsonMessageConverter">
 		<property name="classMapper">
diff --git a/spring-rabbit-test/src/test/resources/org/springframework/amqp/rabbit/repeatable/annotation-driven-no-rabbit-admin-repeatable-config.xml b/spring-rabbit-test/src/test/resources/org/springframework/amqp/rabbit/repeatable/annotation-driven-no-rabbit-admin-repeatable-config.xml
index a983d0d4..2a5b6c21 100644
--- a/spring-rabbit-test/src/test/resources/org/springframework/amqp/rabbit/repeatable/annotation-driven-no-rabbit-admin-repeatable-config.xml
+++ b/spring-rabbit-test/src/test/resources/org/springframework/amqp/rabbit/repeatable/annotation-driven-no-rabbit-admin-repeatable-config.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-container-factory.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-container-factory.xml
index 4cb6ce6a..b3b0b92c 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-container-factory.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-container-factory.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven container-factory="simpleFactory"/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-handler-method-factory.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-handler-method-factory.xml
index a05985fa..1ecf0f7f 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-handler-method-factory.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-handler-method-factory.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven handler-method-factory="customMessageHandlerMethodFactory"/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-registry.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-registry.xml
index 5155d899..c48db18d 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-registry.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-custom-registry.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 
 	<rabbit:annotation-driven registry="customRegistry"/>
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-default-container-factory.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-default-container-factory.xml
index d9ab0ac6..fc83bd45 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-default-container-factory.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-default-container-factory.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-config.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-config.xml
index edc734e2..237a528c 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-config.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-config.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-configurable-config.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-configurable-config.xml
index d2d62afd..21cc8555 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-configurable-config.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-full-configurable-config.xml
@@ -4,11 +4,11 @@
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xmlns:context="http://www.springframework.org/schema/context"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
 	   http://www.springframework.org/schema/context
-	   http://www.springframework.org/schema/context/spring-context.xsd">
+	   https://www.springframework.org/schema/context/spring-context.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-config.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-config.xml
index 5360942e..9e4f7e22 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-config.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-config.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-listeners-config.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-listeners-config.xml
index 49d80ddd..e3fb87e9 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-listeners-config.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-no-rabbit-admin-listeners-config.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-sample-config.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-sample-config.xml
index 1809d1f2..8be17b0c 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-sample-config.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/annotation-driven-sample-config.xml
@@ -3,9 +3,9 @@
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	   xsi:schemaLocation="http://www.springframework.org/schema/beans
-	   http://www.springframework.org/schema/beans/spring-beans.xsd
+	   https://www.springframework.org/schema/beans/spring-beans.xsd
 	   http://www.springframework.org/schema/rabbit
-	   http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	   https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:annotation-driven/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-0-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-0-context.xml
index 165832f3..c073d5a3 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-0-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-0-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:connection-factory id="connectionFactory"  host="localhost" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-1-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-1-context.xml
index a4b2875c..4d2ab399 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-1-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-1-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<!-- One of 'rabbit-template' or 'rabbit-connection-factory' attributes
 		must be set - context load should fail -->
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-2-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-2-context.xml
index 40bc2bd1..1cdaf0b2 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-2-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/AdminParserTests-2-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:connection-factory id="connectionFactory"  host="localhost" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ConnectionFactoryParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ConnectionFactoryParserTests-context.xml
index 19632b19..1a99fcbf 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ConnectionFactoryParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ConnectionFactoryParserTests-context.xml
@@ -3,9 +3,9 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:task="http://www.springframework.org/schema/task"
-	xsi:schemaLocation="http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
-		http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/task https://www.springframework.org/schema/task/spring-task.xsd
+		http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:connection-factory id="kitchenSink" host="foo" virtual-host="/bar"
 		channel-cache-size="10" port="6888" username="user" password="password"
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserIntegrationTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserIntegrationTests-context.xml
index b83ea0c0..ea4b67a1 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserIntegrationTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserIntegrationTests-context.xml
@@ -2,8 +2,8 @@
 <beans:beans xmlns="http://www.springframework.org/schema/rabbit"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<direct-exchange name="directTest" auto-delete="true">
 		<bindings>
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserTests-context.xml
index 919c0b6e..616f6323 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ExchangeParserTests-context.xml
@@ -4,9 +4,9 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
 
 
 	<rabbit:direct-exchange name="direct" auto-declare="false" declared-by="admin1, admin2">
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-context.xml
index 736e0a83..8f8c5112 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-context.xml
@@ -3,9 +3,9 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
 
 	<rabbit:queue name="foo" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-fail-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-fail-context.xml
index 53910353..7452d386 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-fail-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerParserTests-fail-context.xml
@@ -3,9 +3,9 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
 
 	<rabbit:queue name="foo" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests-context.xml
index cdd37138..35c7c465 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
 		<property name="properties">
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/MismatchedQueueDeclarationTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/MismatchedQueueDeclarationTests-context.xml
index fd72a23f..85983817 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/MismatchedQueueDeclarationTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/MismatchedQueueDeclarationTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:connection-factory id="connectionFactory" host="localhost" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueArgumentsParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueArgumentsParserTests-context.xml
index 195f6305..fd16c072 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueArgumentsParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueArgumentsParserTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:queue-arguments id="args">
 		<entry key="foo" value="bar" />
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIllegalAnonymousTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIllegalAnonymousTests-context.xml
index 8109f55e..6d62395a 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIllegalAnonymousTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIllegalAnonymousTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:queue id="anonymous" durable="true" auto-delete="true" exclusive="true"/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIntegrationTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIntegrationTests-context.xml
index a50b813f..1cdd55f4 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIntegrationTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserIntegrationTests-context.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans" xmlns:beans="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:queue name="arguments">
 		<rabbit:queue-arguments value-type="java.lang.Long">
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserPlaceholderTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserPlaceholderTests-context.xml
index 38cc2d1c..5ddca86f 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserPlaceholderTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserPlaceholderTests-context.xml
@@ -4,9 +4,9 @@
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:beans="http://www.springframework.org/schema/beans"
 	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
 
 	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
 		<property name="properties">
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserTests-context.xml
index 52e68e56..587b68fc 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/QueueParserTests-context.xml
@@ -4,9 +4,9 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
 
 	<rabbit:queue name="foo" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/RabbitNamespaceHandlerTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/RabbitNamespaceHandlerTests-context.xml
index 221ce70b..97d33e5d 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/RabbitNamespaceHandlerTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/RabbitNamespaceHandlerTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<direct-exchange name="direct-test"
 		xmlns="http://www.springframework.org/schema/rabbit">
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/TemplateParserTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/TemplateParserTests-context.xml
index aa243218..5600b0c1 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/TemplateParserTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/TemplateParserTests-context.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	   xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	   xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<rabbit:template id="template" connection-factory="connectionFactory"/>
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/core/RabbitTemplateIntegrationTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/core/RabbitTemplateIntegrationTests-context.xml
index ee72c526..314c2fa7 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/core/RabbitTemplateIntegrationTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/core/RabbitTemplateIntegrationTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:template id="routingTemplate"
 		connection-factory="rcf"
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/ListenFromAutoDeleteQueueTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/ListenFromAutoDeleteQueueTests-context.xml
index 6a9ab515..d3b23370 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/ListenFromAutoDeleteQueueTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/ListenFromAutoDeleteQueueTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
 	<rabbit:connection-factory id="rabbitConnectionFactory" host="localhost" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/StopStartIntegrationTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/StopStartIntegrationTests-context.xml
index fb382499..8d53cf81 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/StopStartIntegrationTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/listener/StopStartIntegrationTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
     <rabbit:connection-factory id="connectionFactory" host="localhost" />
 
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/remoting/RemotingTests-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/remoting/RemotingTests-context.xml
index 61bce9e3..897d3db1 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/remoting/RemotingTests-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/remoting/RemotingTests-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xsi:schemaLocation="http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
+		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="client" class="org.springframework.amqp.remoting.client.AmqpProxyFactoryBean">
 		<property name="amqpTemplate" ref="template" />
diff --git a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/retry/retry-context.xml b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/retry/retry-context.xml
index 82539abc..46464d5a 100644
--- a/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/retry/retry-context.xml
+++ b/spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/retry/retry-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
 
     <rabbit:connection-factory id="connectionFactory" host="localhost" />
 
diff --git a/src/checkstyle/checkstyle-suppressions.xml b/src/checkstyle/checkstyle-suppressions.xml
index 100adae9..95205124 100644
--- a/src/checkstyle/checkstyle-suppressions.xml
+++ b/src/checkstyle/checkstyle-suppressions.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE suppressions PUBLIC
-    "-//Puppy Crawl//DTD Suppressions 1.1//EN"
-    "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
+		"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
+		"https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>
 	<suppress files="package-info\.java" checks=".*" />
 	<suppress files="[\\/]test[\\/]" checks="RequireThis" />
diff --git a/src/checkstyle/checkstyle.xml b/src/checkstyle/checkstyle.xml
index 71ca7f32..a1631611 100644
--- a/src/checkstyle/checkstyle.xml
+++ b/src/checkstyle/checkstyle.xml
@@ -1,5 +1,7 @@
 <?xml version="1.0"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC
+		"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+		"https://checkstyle.org/dtds/configuration_1_3.dtd">
 <module name="Checker">
 
 	<module name="SuppressionFilter">