diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0395243677fcee92b39eb218ce2f65bae6cacd39..0ad12a1cdecc09cd7a7b678d09e1c9d1e5391d03 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,7 +88,11 @@ jobs:
             env:
                 DOWNSTREAM_PROJECT: ${{ matrix.downstream_project }}
             run: |
-                git clone "https://github.com/inducer/$DOWNSTREAM_PROJECT.git"
+                if [[ "$DOWNSTREAM_PROJECT" = "pytential" ]] && [[ "$GITHUB_HEAD_REF" = "derivtaker" ]]; then
+                  git clone "https://github.com/isuruf/$DOWNSTREAM_PROJECT.git" -b "$GITHUB_HEAD_REF"
+                else
+                  git clone "https://github.com/inducer/$DOWNSTREAM_PROJECT.git"
+                fi
                 cd "$DOWNSTREAM_PROJECT"
                 echo "*** $DOWNSTREAM_PROJECT version: $(git rev-parse --short HEAD)"
                 sed -i "/egg=sumpy/ c git+file://$(readlink -f ..)#egg=sumpy" requirements.txt