diff --git a/pyproject.toml b/pyproject.toml
index cf11590..71295b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "python-dotenv>=1.0.1",
     "sqlmodel>=0.0.39",
     "langgraph>=0.1.0",
-    "langchain-core>=0.2.0",
+    "langchain-core>=1.5.1",
     "langchain-google-genai>=1.0.0",
     "langfuse>=2.0.0",
     "litellm>=1.93.0",
diff --git a/uv.lock b/uv.lock
index 5ff3a62..a7c5cb1 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1207,7 +1207,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.9"
+version = "1.5.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -1220,9 +1220,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/2a/b9/e937d0a90b26540bff07e7a7c64349f3b29c2dcc36257cd1cd3fdce17f2a/langchain_core-1.4.9.tar.gz", hash = "sha256:f8078901145bed0466755277500a5a22822a7b628808c4c0a28d4fc88895fcf2", size = 967294, upload-time = "2026-07-08T20:06:54.191Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a7/fc/84e23e8adff5adcd7792273ad610c4972ec534658a52698fb8db6defa87a/langchain_core-1.5.1.tar.gz", hash = "sha256:b0df382704c6403c1e0c9603415bce09290455d4aeeb38f350d15f78ca597483", size = 972219, upload-time = "2026-07-23T20:13:22.282Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/84/70/ade2fada52772798ef815b6352b59e71b116aa0c32c3aef5be3dc2cbed12/langchain_core-1.4.9-py3-none-any.whl", hash = "sha256:28e3909e2a10cc81504952d795ac0a9e014c0018121ef89d48dd396fa09ec624", size = 558293, upload-time = "2026-07-08T20:06:52.382Z" },
+    { url = "https://files.pythonhosted.org/packages/55/1e/1eb8833dc59b9c1f49da89a4a1ad7510440c9eb57fb539ea2203294a1acd/langchain_core-1.5.1-py3-none-any.whl", hash = "sha256:c5ec8f51dd05124f950c9afd0fd8bb3f7be4e405eeb868d481b2f8ff652cb9d2", size = 561634, upload-time = "2026-07-23T20:13:20.717Z" },
 ]
 
 [[package]]
@@ -2383,7 +2383,7 @@ requires-dist = [
     { name = "httpx", specifier = ">=0.27.0" },
     { name = "langchain", specifier = ">=1.3.14" },
     { name = "langchain-community", specifier = ">=0.4.2" },
-    { name = "langchain-core", specifier = ">=0.2.0" },
+    { name = "langchain-core", specifier = ">=1.5.1" },
     { name = "langchain-google-genai", specifier = ">=1.0.0" },
     { name = "langchain-litellm", specifier = ">=0.6.4" },
     { name = "langchain-text-splitters", specifier = ">=0.3.0" },