diff --git a/ci/requirements/py-slepc.yml b/ci/requirements/py-slepc.yml
index 57b6b3e3..5e191615 100644
--- a/ci/requirements/py-slepc.yml
+++ b/ci/requirements/py-slepc.yml
@@ -20,5 +20,5 @@ dependencies:
   - pytest-cov
   - scipy
   - slepc=*=*complex*
-  - slepc4py
+  - slepc4py<=3.21
   - tqdm
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