diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index 7e47a9cd83..486c5fbfb7 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -212,6 +212,7 @@ jobs:
           pip install -U pip
           pip install --group ./firedrake-repo/pyproject.toml:ci
 
+          pip install -I "firedrake-fiat @ git+https://github.com/firedrakeproject/fiat.git@pbrubeck/test/fiat"
           firedrake-clean
           pip list