diff --git a/.github/workflows/header-gen.yml b/.github/workflows/header-gen.yml
index a66036b..c986465 100644
--- a/.github/workflows/header-gen.yml
+++ b/.github/workflows/header-gen.yml
@@ -38,6 +38,7 @@ jobs:
       working-directory: ./header-gen
 
     - name: Update version
+      if: github.event_name != 'pull_request'
       uses: microbit-foundation/npm-package-versioner-action@v1
       with:
         working-directory: ./header-gen