diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index a149bbe4cb8008125d3fe2a7dc029445b66a6ab4..b7824b0bb6b3cdbc4070215affce4e3ae7f1751d 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -9,3 +9,4 @@ dependencies:
 - pocl
 - osx-pocl-opencl
 - mako
+- pybind11