diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index 26220a4bfc92c992cd4d0c4bf5b3ae2aeeace1a8..587b7c91b0a07531bb342785f308cbd7573ddd34 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -15,6 +15,9 @@ dependencies:
 # for Pytential
 - cython
 
+# for pymetis
+- pybind11
+
 # Only needed to make pylint succeed
 - matplotlib