diff --git a/.github/workflows/notify-docs.yml b/.github/workflows/notify-docs.yml
index 3f4bae1ee..a7efeb9fa 100644
--- a/.github/workflows/notify-docs.yml
+++ b/.github/workflows/notify-docs.yml
@@ -6,9 +6,12 @@ jobs:
   notify:
     runs-on: ubuntu-latest
     steps:
-      - uses: peter-evans/repository-dispatch@v4
+      # v4 currently sends a mismatched Content-Length for this payload on
+      # GitHub-hosted runners. Keep the last verified release until upstream
+      # resolves the regression.
+      - uses: peter-evans/repository-dispatch@v3
         with:
           token: ${{ secrets.DOCS_DISPATCH_TOKEN }}
           repository: OpenAdaptAI/openadapt-maintenance
           event-type: repo-updated
-          client-payload: '{"repo": "${{ github.repository }}", "sha": "${{ github.sha }}"}'
\ No newline at end of file
+          client-payload: '{"repo": "${{ github.repository }}", "sha": "${{ github.sha }}"}'