diff --git a/libtbx/auto_build/conda_envs/cctbx.devenv.yml b/libtbx/auto_build/conda_envs/cctbx.devenv.yml
index ef7f8e5f4c..0f9fbbccc7 100644
--- a/libtbx/auto_build/conda_envs/cctbx.devenv.yml
+++ b/libtbx/auto_build/conda_envs/cctbx.devenv.yml
@@ -15,8 +15,3 @@ dependencies:
   - libtiff
   - pint
   - pybind11
-
-  # dxtbx testing
-  - dials-data
-  - pytest-mock
-  - pytest-xdist