diff --git a/devtools/conda-envs/test_env.yaml b/devtools/conda-envs/test_env.yaml
index 9e3c177..61930de 100644
--- a/devtools/conda-envs/test_env.yaml
+++ b/devtools/conda-envs/test_env.yaml
@@ -14,4 +14,5 @@ dependencies:
   - gmso >= 0.11.1
   - pycifrw
   - garnett
-  - cassandra
\ No newline at end of file
+  - constrainmol
+  - parmed
\ No newline at end of file