diff --git a/environment.yml b/environment.yml
index 12ed8dd..e52124b 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,6 +5,7 @@ dependencies:
   - atomistics =0.1.32
   - langchain =0.2.5
   - numexpr =2.10.0
+  - langchain-anthropic =0.1.23
   - langchain-openai =0.1.8
   - langchain-experimental =0.0.61
   - pymace =0.3.5