diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index ffd714b..8f8674e 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -12,9 +12,9 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.12
+      uses: actions/setup-python@v4
       with:
         python-version: 3.x
     - name: Install dependencies
diff --git a/.github/workflows/testrunner.yml b/.github/workflows/testrunner.yml
index 429115a..bd11d57 100644
--- a/.github/workflows/testrunner.yml
+++ b/.github/workflows/testrunner.yml
@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout Github repo with LFS
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         lfs: true
-    - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+    - name: Set up Python 3.12
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: 3.12
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/setup.cfg b/setup.cfg
index 5bd4cfb..94c9b22 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,10 +26,10 @@ classifiers =
 #scripts=scripts, scripts = ['create_sidecar_files.py']
 [options]
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.12
 install_requires =
     pyhdf>=0.10.5
-    numpy>=1.23.1
+    numpy>=2.2.1
     netCDF4>=1.6.0
     xarray>=2022.6.0
     pystare>=0.8.9
diff --git a/staremaster/create_sidecar_files.py b/staremaster/create_sidecar_files.py
index 555495a..6c4e7fb 100755
--- a/staremaster/create_sidecar_files.py
+++ b/staremaster/create_sidecar_files.py
@@ -64,7 +64,7 @@ def list_granules(folder, product):
     if not product:
         product = ''
     files = glob.glob(folder + '/*')
-    pattern = '.*{product}.*[^_stare]\.(nc|hdf|HDF5)'.format(product=product.upper())
+    pattern = rf'.*{product}.*[^_stare]\.(nc|hdf|HDF5)'.format(product=product.upper())
     granules = list(filter(re.compile(pattern).match, files))
     return granules
 
diff --git a/staremaster/find_missing_sidecars.py b/staremaster/find_missing_sidecars.py
index d5028c8..ff2a087 100755
--- a/staremaster/find_missing_sidecars.py
+++ b/staremaster/find_missing_sidecars.py
@@ -10,15 +10,15 @@
 
 def get_granule_paths(folder, granule_pattern):
     granule_paths = sorted(glob.glob(os.path.expanduser(folder) + '/' + '*' ))
-    pattern = '.*/{}.*[^_stare]\.(nc|hdf|HDF5)'.format(granule_pattern)
-    granule_paths = list(filter(re.compile(pattern).match, granule_paths))        
+    pattern = rf'.*/{granule_pattern}.*[^_stare]\.(nc|hdf|HDF5)'
+    granule_paths = list(filter(re.compile(pattern).match, granule_paths))
     return granule_paths
 
 
 def get_sidecar_paths(folder, granule_pattern):
     sidecar_paths = sorted(glob.glob(os.path.expanduser(folder) + '/' + '*' ))
-    pattern = '.*/{}.*_stare\.(nc|hdf|HDF5)'.format(granule_pattern)
-    sidecar_paths = list(filter(re.compile(pattern).match, sidecar_paths))       
+    pattern = rf'.*/{granule_pattern}.*_stare\.(nc|hdf|HDF5)'
+    sidecar_paths = list(filter(re.compile(pattern).match, sidecar_paths))
     return sidecar_paths
 
 
diff --git a/tox.ini b/tox.ini
index 54998a1..02012e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py36,py37,py38,py39
+envlist = py312,py313
 
 [testenv]
 changedir = tests