diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3d2f88d..c03e1bb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@ Please note we have a code of conduct, please follow it in all your interactions
 
 1. Ensure any install or build dependencies are removed before the end of the layer when doing a build.
 2. Update the README.md with details of changes to the interface, this includes new environment variables, exposed ports, useful file locations and container parameters.
-3. Increase the version numbers in any examples files and the README.md to the new version that this Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
+3. Increase the version numbers in any examples files and the README.md to the new version that this Pull Request would represent. The versioning scheme we use is [SemVer](https://semver.org/).
 4. You may merge the Pull Request in once you have the sign-off of two other developers, or if you do not have permission to do that, you may request the second reviewer to merge it for you.
 
 # Contributor Covenant Code of Conduct