diff --git a/environment-dev.yml b/environment-dev.yml
index b90e1907..36c55f7a 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -18,7 +18,7 @@ dependencies:
   - pytest
   - garnett>=0.7.1
   - openbabel>=3.0.0
-  - openff-toolkit-base >=0.11
+  - openff-toolkit-base >=0.11,<0.16.7
   - openmm
   - gsd>=2.9
   - parmed>=3.4.3