diff --git a/uv.lock b/uv.lock
index 887c65d..e4371df 100644
--- a/uv.lock
+++ b/uv.lock
@@ -873,10 +873,11 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.3.0"
+version = "1.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -885,9 +886,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/59/de/679a53472c25860837e32c0442c962fa86e95317a36460e2c9d5c91b17c2/langchain_core-1.4.0.tar.gz", hash = "sha256:1dc341eed802ed9c117c0df3923c991e5e9e226571e5725c194eeb5bd93d1a7f", size = 920260, upload-time = "2026-05-11T18:42:35.919Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f8/e2/dbfa347aa072a6dc4cd38d6f9ebfc730b4c14c258c47f480f4c5c546f177/langchain_core-1.3.0-py3-none-any.whl", hash = "sha256:baf16ee028475df177b9ab8869a751c79406d64a6f12125b93802991b566cced", size = 515140, upload-time = "2026-04-17T14:51:36.274Z" },
+    { url = "https://files.pythonhosted.org/packages/0f/1a/86c38c27b81913a1c6c12448cab55defb5a1097c7dc9a4cea83f55477a2d/langchain_core-1.4.0-py3-none-any.whl", hash = "sha256:23cbbdb46e38ddd1dd5247e6167e96013eae74bea4c5949c550809970a9e565c", size = 548120, upload-time = "2026-05-11T18:42:33.992Z" },
 ]
 
 [[package]]
@@ -917,6 +918,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d2/95/ea040d87ecb8df9e2fef2a1c331252b116a324ab7a3bdae09928e81244e7/langchain_openai-1.1.16-py3-none-any.whl", hash = "sha256:648becb4fb86d24d56b9292e01878a05cca932bb475909bb8fb85b8c82dd1a02", size = 89202, upload-time = "2026-04-21T19:26:20.498Z" },
 ]
 
+[[package]]
+name = "langchain-protocol"
+version = "0.0.15"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/4f/24/9777489d6fbbee64af0c8f96d4f840239c408cf694f3394672807dafc490/langchain_protocol-0.0.15.tar.gz", hash = "sha256:9ab2d11ee73944754f10e037e717098d3a6796f0e58afa9cadda6154e7655ade", size = 5862, upload-time = "2026-05-01T22:30:04.748Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1d/7a/9c97a7b9cbe4c5dc6a44cdb1545450c28f0c8ce89b9c1f0ee7fbad896263/langchain_protocol-0.0.15-py3-none-any.whl", hash = "sha256:461eb794358f83d5e42635a5797799ffec7b4702314e34edf73ac21e75d3ef79", size = 6982, upload-time = "2026-05-01T22:30:03.877Z" },
+]
+
 [[package]]
 name = "langgraph"
 version = "1.1.9"
@@ -2311,7 +2324,7 @@ dev = [
 requires-dist = [
     { name = "asyncpg", specifier = ">=0.31.0" },
     { name = "content-types", specifier = ">=0.3.0,<0.4.0" },
-    { name = "langchain-core", specifier = ">=1.2.28" },
+    { name = "langchain-core", specifier = ">=1.4.0" },
     { name = "langgraph", specifier = ">=1.1.6" },
     { name = "langgraph-checkpoint-postgres", specifier = ">=3.0.5" },
     { name = "langgraph-checkpoint-redis", specifier = ">=0.4.0" },
@@ -2660,7 +2673,7 @@ requires-dist = [
     { name = "asyncpg", specifier = ">=0.31.0" },
     { name = "jinja2", specifier = ">=3.1.6" },
     { name = "langchain", specifier = ">=1.2.15" },
-    { name = "langchain-core", specifier = ">=1.3.0" },
+    { name = "langchain-core", specifier = ">=1.4.0" },
     { name = "langgraph", specifier = ">=1.1.8" },
     { name = "langgraph-checkpoint-postgres", specifier = ">=3.0.5" },
     { name = "langgraph-checkpoint-redis", specifier = ">=0.4.1" },