diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 568a0a1c8cae502493f3f2992d9c5153a5209e56..c107673e43ab5a375a65348559d83b1473cbfe76 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,4 +75,29 @@ jobs:
                 build_py_project_in_conda_env
                 run_examples
 
+
+    downstream_tests:
+        strategy:
+            matrix:
+                downstream_project: [pytential]
+        name: Tests for downstream project ${{ matrix.downstream_project }}
+        runs-on: ubuntu-latest
+        steps:
+        -   uses: actions/checkout@v2
+        -   name: "Main Script"
+            env:
+                DOWNSTREAM_PROJECT: ${{ matrix.downstream_project }}
+            run: |
+                git clone "https://github.com/inducer/$DOWNSTREAM_PROJECT.git"
+                cd "$DOWNSTREAM_PROJECT"
+                echo "*** $DOWNSTREAM_PROJECT version: $(git rev-parse --short HEAD)"
+                sed -i "/egg=boxtree/ c git+file://$(readlink -f ..)#egg=boxtree" requirements.txt
+                export CONDA_ENVIRONMENT=.test-conda-env-py3.yml
+                # Avoid slow or complicated tests in downstream projects
+                export PYTEST_ADDOPTS="-k 'not (slowtest or octave or mpi)'"
+                curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/ci-support.sh
+                . ./ci-support.sh
+                build_py_project_in_conda_env
+                test_py_project
+
 # vim: sw=4