diff --git a/.github/workflows/post-release-updates.yml b/.github/workflows/post-release-updates.yml
index 813c9fd0bc1..bb9a1ef1175 100644
--- a/.github/workflows/post-release-updates.yml
+++ b/.github/workflows/post-release-updates.yml
@@ -155,8 +155,10 @@ jobs:
               echo ":warning: File "$NEXT_RELEASE_VERSION_INSTRUCTIONS_FILENAME.md" already exists. No action needed." >> $GITHUB_STEP_SUMMARY
           fi
           
-          # If an entry for the next version doesn't exist yet
+          # Check if this release version exists in Release-testing-instructions.md
           if ! grep -q "v$NEXT_RELEASE_VERSION" Release-testing-instructions.md; then
+            # If it doesn't exist, remove all trailing newlines and add the new version for this release
+            perl -pi -e 'BEGIN{undef $/;} s/\n+\z//' Release-testing-instructions.md
             echo -ne "\n* [v$NEXT_RELEASE_VERSION](https://github.com/Automattic/woocommerce-payments/wiki/$NEXT_RELEASE_VERSION_INSTRUCTIONS_FILENAME)" >> Release-testing-instructions.md
             echo "Added a new entry for v$NEXT_RELEASE_VERSION in \"Release-testing-instructions.md\"." >> $GITHUB_STEP_SUMMARY
             HAS_CHANGES=true
diff --git a/changelog/update-post-release-updates b/changelog/update-post-release-updates
new file mode 100644
index 00000000000..83360bae0a3
--- /dev/null
+++ b/changelog/update-post-release-updates
@@ -0,0 +1,5 @@
+Significance: patch
+Type: dev
+Comment: Just a minor change in a GitHub Actions workflow to make it more robust.
+
+