diff --git a/docs/scripts/check_imports.py b/docs/scripts/check_imports.py
index 461d2bb858f..1ff760beb5f 100644
--- a/docs/scripts/check_imports.py
+++ b/docs/scripts/check_imports.py
@@ -86,7 +86,7 @@ def _is_relevant_import(module: str) -> bool:
         "langchain",
         "langchain_core",
         "langchain_community",
-        "langchain_experimental",
+        # "langchain_experimental",
         "langchain_text_splitters",
     ]
     return module.split(".")[0] in recognized_packages
diff --git a/libs/core/langchain_core/version.py b/libs/core/langchain_core/version.py
index d554053db1d..f7be81e1149 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 = "1.0.0dev0"
+VERSION = "1.0.0a1"
diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index ad8caa9b907..d8b373602be 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "pydantic>=2.7.4",
 ]
 name = "langchain-core"
-version = "1.0.0dev0"
+version = "1.0.0a1"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 
diff --git a/libs/core/uv.lock b/libs/core/uv.lock
index 0bf6a2fe1b8..a91e58fb79e 100644
--- a/libs/core/uv.lock
+++ b/libs/core/uv.lock
@@ -962,7 +962,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "." }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/deepseek/uv.lock b/libs/partners/deepseek/uv.lock
index cb8810d4801..4b2e2f8ce9c 100644
--- a/libs/partners/deepseek/uv.lock
+++ b/libs/partners/deepseek/uv.lock
@@ -332,7 +332,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/fireworks/uv.lock b/libs/partners/fireworks/uv.lock
index d3922281655..401697924dc 100644
--- a/libs/partners/fireworks/uv.lock
+++ b/libs/partners/fireworks/uv.lock
@@ -570,7 +570,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/groq/uv.lock b/libs/partners/groq/uv.lock
index 9046a43c51e..a332cf446ad 100644
--- a/libs/partners/groq/uv.lock
+++ b/libs/partners/groq/uv.lock
@@ -292,7 +292,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/mistralai/uv.lock b/libs/partners/mistralai/uv.lock
index 421cd82cee9..770882bda73 100644
--- a/libs/partners/mistralai/uv.lock
+++ b/libs/partners/mistralai/uv.lock
@@ -309,7 +309,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/xai/uv.lock b/libs/partners/xai/uv.lock
index e16b6382102..e934051a2af 100644
--- a/libs/partners/xai/uv.lock
+++ b/libs/partners/xai/uv.lock
@@ -549,7 +549,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0.dev0"
+version = "1.0.0a1"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },