diff --git a/pyproject.toml b/pyproject.toml
index d49f2f8..c6cf4f7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -111,9 +111,9 @@ Issues = "https://github.com/Vanshcloud/Predictive-Maintenance-GenAI/issues"
 #             pip install -e ".[google]"     # Gemini
 #             pip install -e ".[llm]"        # both
 [project.optional-dependencies]
-ollama = ["langchain-ollama>=0.1.0,<1.0.0"]
-google = ["langchain-google-genai>=1.0.0,<3.0.0"]
-llm = ["langchain-ollama>=0.1.0,<1.0.0", "langchain-google-genai>=1.0.0,<3.0.0"]
+ollama = ["langchain-ollama>=0.1.0,<2.0.0"]
+google = ["langchain-google-genai>=1.0.0,<5.0.0"]
+llm = ["langchain-ollama>=0.1.0,<2.0.0", "langchain-google-genai>=1.0.0,<5.0.0"]
 
 # ---- Black (Code Formatter) ----
 # WHY: Black enforces a consistent code style automatically.
diff --git a/requirements.txt b/requirements.txt
index d227d31..d026f9a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,10 +25,10 @@ scikit-learn>=1.3.0,<2.0.0
 tensorflow>=2.15.0,<3.0.0
 
 # --- Layer 3: GenAI / LangChain ---
-langchain>=0.2.0,<1.0.0
-langchain-community>=0.2.0,<1.0.0
-langchain-openai>=0.1.0,<1.0.0
-openai>=1.0.0,<2.0.0
+langchain>=1.3.18,<2.0.0
+langchain-community>=0.4.2,<1.0.0
+langchain-openai>=1.6.0,<2.0.0
+openai>=3.6.0,<4.0.0
 
 # --- Layer 4: API Framework ---
 fastapi>=0.110.0,<1.0.0