diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88814f8ad3cf4711eb3964a1605f2cce9822239a..8e3441731f7e21512b45dd83f76658ff504c2e77 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -68,7 +68,7 @@ jobs:
                 python-version: '3.x'
         -   name: "Main Script"
             run: |
-                EXTRA_INSTALL="numpy"
+                EXTRA_INSTALL="numpy sympy"
                 curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/ci-support.sh
                 . ci-support.sh
                 build_py_project_in_venv