diff --git a/sgl-kernel/pyproject.toml b/sgl-kernel/pyproject.toml
index d5b0021fc..e250ad4c1 100644
--- a/sgl-kernel/pyproject.toml
+++ b/sgl-kernel/pyproject.toml
@@ -8,7 +8,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "sglang-kernel"
-version = "0.4.1.post1"
+version = "0.4.2"
 authors = [
   { name="SGLang Kernel Team", email="sglang@lmsys.org" },
 ]
diff --git a/sgl-kernel/pyproject_cpu.toml b/sgl-kernel/pyproject_cpu.toml
index e346e60cd..e37662750 100644
--- a/sgl-kernel/pyproject_cpu.toml
+++ b/sgl-kernel/pyproject_cpu.toml
@@ -8,7 +8,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "sglang-kernel-cpu"
-version = "0.4.1.post1"
+version = "0.4.2"
 description = "Kernel Library for SGLang"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/sgl-kernel/pyproject_musa.toml b/sgl-kernel/pyproject_musa.toml
index 57ddc0cc4..aee8f4337 100644
--- a/sgl-kernel/pyproject_musa.toml
+++ b/sgl-kernel/pyproject_musa.toml
@@ -10,7 +10,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sglang-kernel"
-version = "0.4.1.post1"
+version = "0.4.2"
 description = "Kernel Library for SGLang"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/sgl-kernel/pyproject_rocm.toml b/sgl-kernel/pyproject_rocm.toml
index acd97d8c9..4125960ca 100644
--- a/sgl-kernel/pyproject_rocm.toml
+++ b/sgl-kernel/pyproject_rocm.toml
@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sglang-kernel"
-version = "0.4.1.post1"
+version = "0.4.2"
 description = "Kernel Library for SGLang"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/sgl-kernel/python/sgl_kernel/version.py b/sgl-kernel/python/sgl_kernel/version.py
index 160080c96..df1243329 100644
--- a/sgl-kernel/python/sgl_kernel/version.py
+++ b/sgl-kernel/python/sgl_kernel/version.py
@@ -1 +1 @@
-__version__ = "0.4.1.post1"
+__version__ = "0.4.2"