diff --git a/devtools/conda-envs/test_env.yaml b/devtools/conda-envs/test_env.yaml
index a9434d0..008045a 100644
--- a/devtools/conda-envs/test_env.yaml
+++ b/devtools/conda-envs/test_env.yaml
@@ -18,7 +18,7 @@ dependencies:
   - ipython
   - pymbar<4
   - ambertools
-  - biosimspace>=2023.4.0
+  - biosimspace>2023.4
   - numpydoc
   - gromacs