diff --git a/libs/core/langchain_core/version.py b/libs/core/langchain_core/version.py
index 07a8156ecc6..b035d9b5722 100644
--- a/libs/core/langchain_core/version.py
+++ b/libs/core/langchain_core/version.py
@@ -1,3 +1,3 @@
 """langchain-core version information and utilities."""
 
-VERSION = "0.3.55"
+VERSION = "0.3.56rc1"
diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index ef4ee2f627f..17a94bf835a 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -17,7 +17,7 @@ dependencies = [
     "pydantic<3.0.0,>=2.7.4; python_full_version >= \"3.12.4\"",
 ]
 name = "langchain-core"
-version = "0.3.55"
+version = "0.3.56rc1"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 
diff --git a/libs/core/uv.lock b/libs/core/uv.lock
index 06c9ba2e20a..07ca00fd4d0 100644
--- a/libs/core/uv.lock
+++ b/libs/core/uv.lock
@@ -937,7 +937,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "0.3.55"
+version = "0.3.56rc1"
 source = { editable = "." }
 dependencies = [
     { name = "jsonpatch" },
@@ -1104,7 +1104,7 @@ test-integration = [
 ]
 typing = [
     { name = "lxml-stubs", specifier = ">=0.5.1,<1.0.0" },
-    { name = "mypy", specifier = ">=1.10,<2.0" },
+    { name = "mypy", specifier = ">=1.15,<2.0" },
     { name = "tiktoken", specifier = ">=0.8.0,<1.0.0" },
     { name = "types-requests", specifier = ">=2.31.0.20240218,<3.0.0.0" },
 ]