diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3fe07592..cad944d6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -55,9 +55,9 @@ jobs:
         run: |
           grep -P 'auto_(char|gchar|gcharv|gerror|guchar|jid|sqlite|gfd|FILE)[\w *]*;$' -r src && exit -1 || true
       - name: Run clang-format
-        uses: jidicula/clang-format-action@v4.11.0
+        uses: jidicula/clang-format-action@v4.15.0
         with:
-          clang-format-version: '16'
+          clang-format-version: '21'
           check-path: 'src'
 
   spell-check:
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b7a013b4..db17a260 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -63,7 +63,7 @@ We will then pull from your repository and merge manually.
 Follow the style already present ;-)
 
 To make this easier for you we created a `.clang-format` file.
-You'll need to have `clang-format` installed.
+You'll need to have `clang-format` installed. We currently use **version 21**, which is also the version enforced by our CI in `.github/workflows/main.yml`.
 
 Then just run `make format` before you do any commit.