diff --git a/pyproject.toml b/pyproject.toml
index 1f3a7f92cc..f0363c90ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
   # TODO RELEASE
   "fenics-ufl @ git+https://github.com/FEniCS/ufl.git@main",
   # TODO RELEASE
-  "firedrake-fiat @ git+https://github.com/firedrakeproject/fiat.git@main",
+  "firedrake-fiat @ git+https://github.com/firedrakeproject/fiat.git@pbrubeck/simplify-indexed",
   "h5py>3.12.1",
   "immutabledict",
   "libsupermesh",