diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 482189d..6c73498 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,24 +20,23 @@ jobs:
   core:
     strategy:
       matrix:
-        os: [ubuntu-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        os: [ubuntu-24.04]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
         include:
         - os: macos-latest
           python-version: "3.10"
 
     runs-on: ${{ matrix.os }}
 
+    env:
+      FC: gfortran-14
+
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: prereqs for f2py (macOS)
-      if: runner.os == 'macOS'
-      run: brew reinstall gcc
-
     - run: pip install .[tests,lint]
 
     - run: flake8
@@ -59,18 +58,17 @@ jobs:
       with:
         update: true
         install: >-
-          mingw-w64-x86_64-ninja
           mingw-w64-x86_64-gcc-fortran
     # Github actions Gfortran in default image is messed up.
 
     - name: Put MSYS2_MinGW64 on PATH
       run: echo "${{ runner.temp }}/msys64/mingw64/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: '3.10'
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - run: python -m pip install .[tests,lint]
 
diff --git a/pyproject.toml b/pyproject.toml
index de2696d..d4ad752 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ classifiers = [
   "Topic :: Scientific/Engineering :: Atmospheric Science"
 ]
 dynamic = ["readme"]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = ["numpy", "xarray", "python-dateutil"]
 
 [project.optional-dependencies]
@@ -33,6 +33,4 @@ line-length = 100
 [tool.mypy]
 files = ["src", "example"]
 allow_redefinition = true
-show_error_context = false
-show_column_numbers = true
 ignore_missing_imports = true