diff --git a/custom-stream-apps/partitioning-consumer-sample-kafka/pom.xml b/custom-stream-apps/partitioning-consumer-sample-kafka/pom.xml
index 54abe03..4084fca 100644
--- a/custom-stream-apps/partitioning-consumer-sample-kafka/pom.xml
+++ b/custom-stream-apps/partitioning-consumer-sample-kafka/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>partitioning-consumer-sample-kafka</artifactId>
diff --git a/custom-stream-apps/partitioning-consumer-sample-kafka/src/main/docker/assembly.xml b/custom-stream-apps/partitioning-consumer-sample-kafka/src/main/docker/assembly.xml
index 7c83924..51be93c 100644
--- a/custom-stream-apps/partitioning-consumer-sample-kafka/src/main/docker/assembly.xml
+++ b/custom-stream-apps/partitioning-consumer-sample-kafka/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/custom-stream-apps/partitioning-consumer-sample-rabbit/pom.xml b/custom-stream-apps/partitioning-consumer-sample-rabbit/pom.xml
index 2498c2f..f72e181 100644
--- a/custom-stream-apps/partitioning-consumer-sample-rabbit/pom.xml
+++ b/custom-stream-apps/partitioning-consumer-sample-rabbit/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>partitioning-consumer-sample-rabbit</artifactId>
diff --git a/custom-stream-apps/partitioning-consumer-sample-rabbit/src/main/docker/assembly.xml b/custom-stream-apps/partitioning-consumer-sample-rabbit/src/main/docker/assembly.xml
index 01f2e26..5bb07ad 100644
--- a/custom-stream-apps/partitioning-consumer-sample-rabbit/src/main/docker/assembly.xml
+++ b/custom-stream-apps/partitioning-consumer-sample-rabbit/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/custom-stream-apps/partitioning-producer-sample-kafka/pom.xml b/custom-stream-apps/partitioning-producer-sample-kafka/pom.xml
index d01eb6c..a2ca7e0 100644
--- a/custom-stream-apps/partitioning-producer-sample-kafka/pom.xml
+++ b/custom-stream-apps/partitioning-producer-sample-kafka/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<artifactId>partitioning-producer-sample-kafka</artifactId>
diff --git a/custom-stream-apps/partitioning-producer-sample-kafka/src/main/docker/assembly.xml b/custom-stream-apps/partitioning-producer-sample-kafka/src/main/docker/assembly.xml
index edf4e7b..3498a9e 100644
--- a/custom-stream-apps/partitioning-producer-sample-kafka/src/main/docker/assembly.xml
+++ b/custom-stream-apps/partitioning-producer-sample-kafka/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/custom-stream-apps/partitioning-producer-sample-rabbit/pom.xml b/custom-stream-apps/partitioning-producer-sample-rabbit/pom.xml
index f1009dc..16846e7 100644
--- a/custom-stream-apps/partitioning-producer-sample-rabbit/pom.xml
+++ b/custom-stream-apps/partitioning-producer-sample-rabbit/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<artifactId>partitioning-producer-sample-rabbit</artifactId>
diff --git a/custom-stream-apps/partitioning-producer-sample-rabbit/src/main/docker/assembly.xml b/custom-stream-apps/partitioning-producer-sample-rabbit/src/main/docker/assembly.xml
index 3f016f9..92e12d5 100644
--- a/custom-stream-apps/partitioning-producer-sample-rabbit/src/main/docker/assembly.xml
+++ b/custom-stream-apps/partitioning-producer-sample-rabbit/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/custom-stream-apps/pom.xml b/custom-stream-apps/pom.xml
index 5fb6bcf..70d40e4 100644
--- a/custom-stream-apps/pom.xml
+++ b/custom-stream-apps/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>io.spring.cloud.stream.acceptance</groupId>
@@ -75,7 +75,7 @@
         <repository>
             <id>spring-snapshots</id>
             <name>Spring Snapshots</name>
-            <url>http://repo.spring.io/libs-snapshot-local</url>
+            <url>https://repo.spring.io/libs-snapshot-local</url>
             <snapshots>
                 <enabled>true</enabled>
             </snapshots>
@@ -86,7 +86,7 @@
         <repository>
             <id>spring-milestones</id>
             <name>Spring Milestones</name>
-            <url>http://repo.spring.io/libs-milestone-local</url>
+            <url>https://repo.spring.io/libs-milestone-local</url>
             <snapshots>
                 <enabled>false</enabled>
             </snapshots>
@@ -94,7 +94,7 @@
         <repository>
             <id>spring-releases</id>
             <name>Spring Releases</name>
-            <url>http://repo.spring.io/release</url>
+            <url>https://repo.spring.io/release</url>
             <snapshots>
                 <enabled>false</enabled>
             </snapshots>
@@ -104,7 +104,7 @@
         <pluginRepository>
             <id>spring-snapshots</id>
             <name>Spring Snapshots</name>
-            <url>http://repo.spring.io/libs-snapshot-local</url>
+            <url>https://repo.spring.io/libs-snapshot-local</url>
             <snapshots>
                 <enabled>true</enabled>
             </snapshots>
@@ -115,7 +115,7 @@
         <pluginRepository>
             <id>spring-milestones</id>
             <name>Spring Milestones</name>
-            <url>http://repo.spring.io/libs-milestone-local</url>
+            <url>https://repo.spring.io/libs-milestone-local</url>
             <snapshots>
                 <enabled>false</enabled>
             </snapshots>
@@ -123,7 +123,7 @@
         <pluginRepository>
             <id>spring-releases</id>
             <name>Spring Releases</name>
-            <url>http://repo.spring.io/libs-release-local</url>
+            <url>https://repo.spring.io/libs-release-local</url>
             <snapshots>
                 <enabled>false</enabled>
             </snapshots>
diff --git a/custom-stream-apps/uppercase-transformer-kafka/pom.xml b/custom-stream-apps/uppercase-transformer-kafka/pom.xml
index 7c3e2a4..f86d0dc 100644
--- a/custom-stream-apps/uppercase-transformer-kafka/pom.xml
+++ b/custom-stream-apps/uppercase-transformer-kafka/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>uppercase-transformer-kafka</artifactId>
diff --git a/custom-stream-apps/uppercase-transformer-kafka/src/main/docker/assembly.xml b/custom-stream-apps/uppercase-transformer-kafka/src/main/docker/assembly.xml
index 6484aac..288d41e 100644
--- a/custom-stream-apps/uppercase-transformer-kafka/src/main/docker/assembly.xml
+++ b/custom-stream-apps/uppercase-transformer-kafka/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/custom-stream-apps/uppercase-transformer-rabbit/pom.xml b/custom-stream-apps/uppercase-transformer-rabbit/pom.xml
index 41f2440..b2fe770 100644
--- a/custom-stream-apps/uppercase-transformer-rabbit/pom.xml
+++ b/custom-stream-apps/uppercase-transformer-rabbit/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>uppercase-transformer-rabbit</artifactId>
diff --git a/custom-stream-apps/uppercase-transformer-rabbit/src/main/docker/assembly.xml b/custom-stream-apps/uppercase-transformer-rabbit/src/main/docker/assembly.xml
index ea2e2b4..9b1da47 100644
--- a/custom-stream-apps/uppercase-transformer-rabbit/src/main/docker/assembly.xml
+++ b/custom-stream-apps/uppercase-transformer-rabbit/src/main/docker/assembly.xml
@@ -1,7 +1,7 @@
 <assembly
         xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
     <id>uppercase-transformer-kafka</id>
     <dependencySets>
         <dependencySet>
diff --git a/pom.xml b/pom.xml
index 2aa7574..dd19415 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>spring-cloud-stream-acceptance-tests-parent</artifactId>
diff --git a/spring-cloud-stream-acceptance-tests/pom.xml b/spring-cloud-stream-acceptance-tests/pom.xml
index c2a5b96..14d33d9 100644
--- a/spring-cloud-stream-acceptance-tests/pom.xml
+++ b/spring-cloud-stream-acceptance-tests/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>spring-cloud-stream-acceptance-tests</artifactId>