diff --git a/.github/workflows/downstream.yml b/.github/workflows/downstream.yml
index 641d03f5a5..db86eb5729 100644
--- a/.github/workflows/downstream.yml
+++ b/.github/workflows/downstream.yml
@@ -75,3 +75,16 @@ jobs:
         # cd ../sage/
         # # From https://github.com/sagemath/sage/blob/develop/pkgs/sagemath-repl/tox.ini
         # sage-runtests -p --environment=sage.all__sagemath_repl --baseline-stats-path=pkgs/sagemath-repl/known-test-failures.json --initial --optional=sage src/sage/repl src/sage/doctest src/sage/misc/sage_input.py src/sage/misc/sage_eval.py
+    - name: Install pyflyby
+      run: |
+        cd ..
+        git clone https://github.com/deshaw/pyflyby
+        cd pyflyby
+        pip install -e .
+        # TODO: use [test] group instead once available
+        pip install 'pytest<=8' requests
+        cd ..
+    - name: Test pyflyby (IPython integration only)
+      run: |
+        cd ../pyflyby
+        pytest tests/test_interactive.py -k 'not test_timeit_complete_autoimport_member_1'