diff --git a/.github/workflows/prepare-release-pr.yml b/.github/workflows/prepare-release-pr.yml
index 205404772..429834b3f 100644
--- a/.github/workflows/prepare-release-pr.yml
+++ b/.github/workflows/prepare-release-pr.yml
@@ -44,9 +44,9 @@ jobs:
     - name: Prepare release PR (minor/patch release)
       if: github.event.inputs.major == 'no'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --prerelease '${{ github.event.inputs.prerelease }}'
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --prerelease='${{ github.event.inputs.prerelease }}'
 
     - name: Prepare release PR (major release)
       if: github.event.inputs.major == 'yes'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --major --prerelease '${{ github.event.inputs.prerelease }}'
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --major --prerelease='${{ github.event.inputs.prerelease }}'