diff --git a/CONTRIBUTING.adoc b/CONTRIBUTING.adoc
index 9b4fb56e9e..7cc6b1a992 100644
--- a/CONTRIBUTING.adoc
+++ b/CONTRIBUTING.adoc
@@ -12,7 +12,7 @@ Each Spring module is slightly different than another in terms of team size, num
 
 = Importing into IDE
 
-The following provides information on setting up a development environment that can run the sample in http://www.springsource.org/sts[Spring Tool Suite 3.6.0+]. Other IDE's should work using Gradle's IDE support, but have not been tested.
+The following provides information on setting up a development environment that can run the sample in https://www.springsource.org/sts[Spring Tool Suite 3.6.0+]. Other IDE's should work using Gradle's IDE support, but have not been tested.
 
 * IDE Setup
 * Install Spring Tool Suite 3.6.0+
@@ -25,7 +25,7 @@ The following provides information on setting up a development environment that
 As of new versions of Spring Tool Suite, you might need to install Groovy Eclipse pointing directly to the updates plugin location. To install Groovy Eclipse on Spring Tool Suite based on Eclipse Oxigen you must do the following steps:
 
 Help->Install New Software…->Add the following URL into _Work with_ field:
-http://dist.springsource.org/snapshot/GRECLIPSE/e4.7/[http://dist.springsource.org/snapshot/GRECLIPSE/e4.7/]
+https://dist.springsource.org/snapshot/GRECLIPSE/e4.7/[https://dist.springsource.org/snapshot/GRECLIPSE/e4.7/]
 
 = Understand the basics
 
@@ -70,8 +70,8 @@ Please carefully follow the whitespace and formatting conventions already presen
 
 Whitespace management tips
 
-. You can use the http://marketplace.eclipse.org/content/anyedit-tools[AnyEdit Eclipse plugin] to ensure spaces are used and to clean up trailing whitespaces.
-. Use git's pre-commit.sample hook to prevent invalid whitespace from being pushed out. You can enable it by moving ~/spring-security/.git/hooks/pre-commit.sample to ~/spring-security/.git/hooks/pre-commit and ensuring it is executable. For more information on hooks refer to http://git-scm.com/book/cs/ch7-3.html[Pro Git's Pre-Commit Hook's section]
+. You can use the https://marketplace.eclipse.org/content/anyedit-tools[AnyEdit Eclipse plugin] to ensure spaces are used and to clean up trailing whitespaces.
+. Use git's pre-commit.sample hook to prevent invalid whitespace from being pushed out. You can enable it by moving ~/spring-security/.git/hooks/pre-commit.sample to ~/spring-security/.git/hooks/pre-commit and ensuring it is executable. For more information on hooks refer to https://git-scm.com/book/cs/ch7-3.html[Pro Git's Pre-Commit Hook's section]
 
 = Add Apache license header to all new classes
 
@@ -108,13 +108,13 @@ Search the codebase to find related unit tests and add additional `@Test` method
 
 = Update spring-security-x.y.rnc for schema changes
 
-Update the http://www.relaxng.org[RELAX NG] schema `spring-security-x.y.rnc` instead of `spring-security-x.y.xsd` if you contribute changes to supported XML configuration. The XML schema file can be generated the following Gradle task:
+Update the https://www.relaxng.org[RELAX NG] schema `spring-security-x.y.rnc` instead of `spring-security-x.y.xsd` if you contribute changes to supported XML configuration. The XML schema file can be generated the following Gradle task:
 
 Changes to the XML schema will be overwritten by the Gradle build task.
 
 = Squash commits
 
-Use git rebase –interactive, git add –patch and other tools to "squash" multiple commits into atomic changes. In addition to the man pages for git, there are many resources online to help you understand how these tools work. Here is one: http://book.git-scm.com/4_interactive_rebasing.html[http://book.git-scm.com/4_interactive_rebasing.html].
+Use git rebase –interactive, git add –patch and other tools to "squash" multiple commits into atomic changes. In addition to the man pages for git, there are many resources online to help you understand how these tools work. Here is one: https://book.git-scm.com/4_interactive_rebasing.html[https://book.git-scm.com/4_interactive_rebasing.html].
 
 = Use real name in git commits