diff --git a/Release-Procedure.md b/Release-Procedure.md
index 616169e..945b13f 100644
--- a/Release-Procedure.md
+++ b/Release-Procedure.md
@@ -55,7 +55,7 @@ Create the change log with: https://github.com/tschaub/github-changelog. For exa
 
 Alternative method:
 
-    git log --merges --abbrev-commit --format=format:'* %s %b - %an' v3.0.0-beta.2..v3.0.0-beta.3 | sed -r 's/Merge pull request (#[0-9]+) from \S* /\1 /' > /tmp/changelog
+    git log --merges --abbrev-commit --format=format:'* %s %b - %an' v3.0.0-beta.2..v3.0.0-beta.3 | sed -E 's/Merge pull request (#[0-9]+) from \S* /\1 /' > /tmp/changelog
 
 Attach the `.zip` archive created above to the release page.