diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e16ac08..302a8f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,10 +24,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu-latest", "macos-latest", "macos-14" ]
-        python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
+        python-version: [ "3.10", "3.11", "3.12", "3.13" ]
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: environment setup
         uses: conda-incubator/setup-miniconda@835234971496cad1653abb28a638a281cf32541f # v3.2.0
         with:
diff --git a/.github/workflows/pypi.yaml b/.github/workflows/pypi.yaml
index cc57f0b..19ffdff 100644
--- a/.github/workflows/pypi.yaml
+++ b/.github/workflows/pypi.yaml
@@ -8,7 +8,7 @@ jobs:
     if: github.repository == 'NCAR/wrf-python'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
@@ -28,7 +28,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
diff --git a/build_envs/environment.yml b/build_envs/environment.yml
index e889284..27ab0a4 100644
--- a/build_envs/environment.yml
+++ b/build_envs/environment.yml
@@ -3,7 +3,7 @@ name: wrf_python_build
 channels:
   - conda-forge
 dependencies:
-  - python>=3.9, <3.14
+  - python
   - compilers
   - basemap
   - cartopy
diff --git a/doc/source/new.rst b/doc/source/new.rst
index 1035cae..03eb680 100644
--- a/doc/source/new.rst
+++ b/doc/source/new.rst
@@ -4,6 +4,10 @@ What's New
 Releases
 -------------
 
+v1.4.2 (December 2025)
+- Release 1.4.2
+- Remove Python upper version pin and drop Python 3.9
+
 v1.4.1 (November 2025)
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/pyproject.toml b/pyproject.toml
index 0f00bb5..da4ae17 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ maintainers = [
 ]
 description = "Diagnostic and interpolation routines for WRF-ARW data."
 readme = "README.md"
-requires-python = ">=3.9, <3.14"
+requires-python = ">=3.10"
 keywords = [
     "python", "wrf-python", "wrf", "forecast", "model",
     "weather research and forecasting", "interpolation",
@@ -26,7 +26,7 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Fortran",
-    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
diff --git a/src/wrf/version.py b/src/wrf/version.py
index bf25615..daa50c7 100644
--- a/src/wrf/version.py
+++ b/src/wrf/version.py
@@ -1 +1 @@
-__version__ = "1.4.1"
+__version__ = "1.4.2"