diff --git a/.github/workflows/python-type-check.yml b/.github/workflows/python-type-check.yml
index f3695be96f..7a2b65890f 100644
--- a/.github/workflows/python-type-check.yml
+++ b/.github/workflows/python-type-check.yml
@@ -31,7 +31,7 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.11"
-          pip-install: -r requirements/requirements-all.txt ty==0.0.78
+          pip-install: -r requirements/requirements-all.txt ty==0.0.84
       # - name: Type-check with Pyright
       #   uses: jakebailey/pyright-action@v2
       #   with:
diff --git a/conversion/bert.py b/conversion/bert.py
index 8ea6c42dc6..23d8b93332 100644
--- a/conversion/bert.py
+++ b/conversion/bert.py
@@ -341,7 +341,7 @@ class NomicBertModel(BertModel):
         else:
             raise ValueError(f"unrecognized parameters: n_positions={npos}, max_trained_positions={mtp}")
 
-        assert self.hparams["activation_function"] == "gelu" if self.is_moe else "swiglu"
+        assert self.hparams["activation_function"] == ("gelu" if self.is_moe else "swiglu")
 
         # this doesn't do anything in the HF version
         assert self.hparams["causal"] is False