diff --git a/samples/kafka/build.gradle b/samples/kafka/build.gradle
index 53a8879..9c2f052 100644
--- a/samples/kafka/build.gradle
+++ b/samples/kafka/build.gradle
@@ -2,7 +2,7 @@ description = 'Spring Integration Kafka Sample'
 
 buildscript {
 	repositories {
-		mavenCentral()
+		maven { url 'https://repo.maven.apache.org/maven2/' }
 		//mavenLocal()
 		maven { url 'https://repo.spring.io/simple/ext-release-local' }
 	}
diff --git a/samples/kafka/gradle/wrapper/gradle-wrapper.properties b/samples/kafka/gradle/wrapper/gradle-wrapper.properties
index 30eb5f3..dc5de8b 100644
--- a/samples/kafka/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/kafka/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.12-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.12-all.zip
diff --git a/samples/splunk/gradle/wrapper/gradle-wrapper.properties b/samples/splunk/gradle/wrapper/gradle-wrapper.properties
index ab2c3a2..a2f8098 100644
--- a/samples/splunk/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/splunk/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.2-bin.zip
diff --git a/spring-integration-ip-extensions/gradle/wrapper/gradle-wrapper.properties b/spring-integration-ip-extensions/gradle/wrapper/gradle-wrapper.properties
index 75a9372..f04af83 100644
--- a/spring-integration-ip-extensions/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-ip-extensions/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.6-bin.zip
diff --git a/spring-integration-jgroups/build.gradle b/spring-integration-jgroups/build.gradle
index 3bb3db1..4f207a8 100644
--- a/spring-integration-jgroups/build.gradle
+++ b/spring-integration-jgroups/build.gradle
@@ -14,7 +14,7 @@ apply plugin: 'idea'
 group = 'org.springframework.integration'
 
 repositories {
-	mavenCentral()
+	maven { url 'https://repo.maven.apache.org/maven2/' }
 	maven { url 'https://repo.springsource.org/libs-milestone' }
 	maven { url 'https://repo.springsource.org/plugins-release' }
 }
diff --git a/spring-integration-jgroups/gradle/wrapper/gradle-wrapper.properties b/spring-integration-jgroups/gradle/wrapper/gradle-wrapper.properties
index c4d4889..ef852c4 100644
--- a/spring-integration-jgroups/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-jgroups/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.6-bin.zip
diff --git a/spring-integration-jt400/gradle/wrapper/gradle-wrapper.properties b/spring-integration-jt400/gradle/wrapper/gradle-wrapper.properties
index 7cd1345..5851d55 100644
--- a/spring-integration-jt400/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-jt400/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-2.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.3-all.zip
diff --git a/spring-integration-print/gradle/wrapper/gradle-wrapper.properties b/spring-integration-print/gradle/wrapper/gradle-wrapper.properties
index 490fcad..2484cd8 100644
--- a/spring-integration-print/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-print/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.6-bin.zip
diff --git a/spring-integration-smpp/gradle/wrapper/gradle-wrapper.properties b/spring-integration-smpp/gradle/wrapper/gradle-wrapper.properties
index 14a3090..c2d11db 100644
--- a/spring-integration-smpp/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-smpp/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.12-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.12-all.zip
diff --git a/spring-integration-voldemort/gradle/wrapper/gradle-wrapper.properties b/spring-integration-voldemort/gradle/wrapper/gradle-wrapper.properties
index 24bbb2c..5aa442d 100755
--- a/spring-integration-voldemort/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-voldemort/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-1.6-bin.zip
diff --git a/spring-integration-xmpp-smack41/gradle/wrapper/gradle-wrapper.properties b/spring-integration-xmpp-smack41/gradle/wrapper/gradle-wrapper.properties
index 7cb7899..5133efb 100644
--- a/spring-integration-xmpp-smack41/gradle/wrapper/gradle-wrapper.properties
+++ b/spring-integration-xmpp-smack41/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-2.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-all.zip