diff --git a/.github/workflows/set-base-branch.yaml b/.github/workflows/set-base-branch.yaml
new file mode 100644
index 0000000..30fb58c
--- /dev/null
+++ b/.github/workflows/set-base-branch.yaml
@@ -0,0 +1,33 @@
+name: Set Base Branch
+
+on:
+  workflow_call:
+    inputs:
+      development-branch-name:
+        description: 'The name of the development branch that pull requests should target'
+        required: false
+        type: string
+        default: 'main'
+      stable-branch-name:
+        description: 'The name of the stable branch'
+        required: false
+        type: string
+        default: 'stable'
+
+jobs:
+  set-base-branch:
+    if: github.base_ref == inputs.stable-branch-name
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Set the pull request base ref
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh api \
+            --method PATCH \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            /repos/${{ github.repository }}/pulls/${{ github.event.number }} \
+            -f base='${{ inputs.development-branch-name }}'