diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7ff6d62..e252417 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -40,7 +40,7 @@ jobs:
           - dependencies: python python3-build twine
             task: make -f Makefile package
     runs-on: ubuntu-latest
-    container: fedora:41  # CURRENT DEVELOPMENT ENVIRONMENT
+    container: fedora:42  # CURRENT DEVELOPMENT ENVIRONMENT
     steps:
       - uses: actions/checkout@v5
         with:
@@ -62,7 +62,7 @@ jobs:
               python3-justbases
             task: PYTHONPATH=./src make -f Makefile test
     runs-on: ubuntu-latest
-    container: fedora:41  # CURRENT DEVELOPMENT ENVIRONMENT
+    container: fedora:42  # CURRENT DEVELOPMENT ENVIRONMENT
     steps:
       - name: Install python3.12
         run: >
diff --git a/setup.cfg b/setup.cfg
index e40ef4f..f934029 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -22,6 +22,7 @@ classifiers =
   Topic :: System :: Operating System Kernels :: Linux
 
 [options]
+python_requires = >=3.12
 install_requires =
   justbases>=0.13