diff --git a/LICENSE.writing.txt b/LICENSE.writing.txt
index 90247b3..9d21229 100644
--- a/LICENSE.writing.txt
+++ b/LICENSE.writing.txt
@@ -1 +1 @@
-Except where otherwise noted, this work is licensed under http://creativecommons.org/licenses/by-nd/3.0/
+Except where otherwise noted, this work is licensed under https://creativecommons.org/licenses/by-nd/3.0/
diff --git a/README.adoc b/README.adoc
index c73baf5..1cf8740 100644
--- a/README.adoc
+++ b/README.adoc
@@ -4,17 +4,17 @@ projects: [spring-cloud]
 ---
 :spring_version: current
 :spring_boot_version: 2.0.0.RC1
-:Controller: http://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/stereotype/Controller.html
-:DispatcherServlet: http://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/web/servlet/DispatcherServlet.html
-:SpringApplication: http://docs.spring.io/spring-boot/docs/{spring_boot_version}/api/org/springframework/boot/SpringApplication.html
-:ResponseBody: http://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/web/bind/annotation/ResponseBody.html
+:Controller: https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/stereotype/Controller.html
+:DispatcherServlet: https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/web/servlet/DispatcherServlet.html
+:SpringApplication: https://docs.spring.io/spring-boot/docs/{spring_boot_version}/api/org/springframework/boot/SpringApplication.html
+:ResponseBody: https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/web/bind/annotation/ResponseBody.html
 :toc:
 :icons: font
 :source-highlighter: prettify
 :project_id: gs-messaging-gcp-pubsub
 This guide walks you through the process of exchanging messages between different parts of a
 program, or different programs, using
-http://docs.spring.io/spring-integration/reference/htmlsingle/#overview-endpoints-channeladapter[Spring Integration channel adapters]
+https://docs.spring.io/spring-integration/reference/htmlsingle/#overview-endpoints-channeladapter[Spring Integration channel adapters]
 and
 https://cloud.google.com/pubsub/[Google Cloud Pub/Sub] as the underlying message exchange mechanism.
 
@@ -82,7 +82,7 @@ Or, if you're using Gradle:
 repositories {
     ...
     maven {
-        url "http://repo.spring.io/libs-milestone"
+        url "https://repo.spring.io/libs-milestone"
     }
     ...
 }