diff --git a/environment.yml b/environment.yml
index 04d7954e..e6150297 100644
--- a/environment.yml
+++ b/environment.yml
@@ -21,12 +21,11 @@ dependencies:
     - langgraph-sdk==0.4.2
     - langchain==1.3.14
     - langchain-core==1.5.1
-    - langchain-openai
-    - langchain-ollama
-    - langchain-anthropic
-    - langchain-google-genai
-    - langchain-groq
-    - langchain-experimental
+    - langchain-openai==1.4.1
+    - langchain-ollama==1.1.0
+    - langchain-anthropic==1.5.2
+    - langchain-google-genai==4.3.1
+    - langchain-groq==1.1.3
     - langchain-mcp-adapters
     - pydantic==2.13.4
     - pubchempy==1.0.5
diff --git a/pyproject.toml b/pyproject.toml
index d847dbea..5e2dfc7d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,12 +20,11 @@ dependencies = [
     "langgraph-sdk==0.4.2",
     "langchain==1.3.14",
     "langchain-core==1.5.1",
-    "langchain-openai",
-    "langchain-ollama",
-    "langchain-anthropic",
-    "langchain-google-genai",
-    "langchain-groq",
-    "langchain-experimental",
+    "langchain-openai==1.4.1",
+    "langchain-ollama==1.1.0",
+    "langchain-anthropic==1.5.2",
+    "langchain-google-genai==4.3.1",
+    "langchain-groq==1.1.3",
     "langchain-mcp-adapters",
     "pydantic==2.13.4",
     "pandas==2.2.3",