diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fd204af8d7..4c8235371f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -74,7 +74,7 @@ jobs:
             --install gusto \
             --install icepack \
             --install irksome \
-            --install femlium || (cat firedrake-install.log && /bin/false)
+            --install femlium --package-branch ufl dham/merge_fenics|| (cat firedrake-install.log && /bin/false)
       - name: Install test dependencies
         run: |
           . ../firedrake_venv/bin/activate