diff --git a/.github/workflows/tox-test.yml b/.github/workflows/tox-test.yml
index 384c979..a228b44 100644
--- a/.github/workflows/tox-test.yml
+++ b/.github/workflows/tox-test.yml
@@ -3,7 +3,7 @@ name: Tox tests
 on: [push, pull_request]
 
 jobs:
-  py39:
+  py310:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -12,12 +12,12 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.10'
       - name: Install Tox
         run: pip install tox
       - name: Run Tox
-        run: tox -e py39
-  py310:
+        run: tox -e py310
+  py311:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -26,12 +26,12 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
       - name: Install Tox
         run: pip install tox
       - name: Run Tox
-        run: tox -e py310
-  py311:
+        run: tox -e py311
+  py312:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -40,11 +40,11 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.11'
+          python-version: '3.12'
       - name: Install Tox
         run: pip install tox
       - name: Run Tox
-        run: tox -e py311
+        run: tox -e py312
   static:
     runs-on: ubuntu-latest
     steps:
diff --git a/test-requirements.txt b/test-requirements.txt
index 9d8c11c..1310274 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,4 +2,7 @@ pytest
 requests-mock
 mock
 bandit==1.7.5;python_version > '3'
+# bandit 1.7.5 imports pbr at runtime but doesn't declare it as a dependency,
+# so a clean resolve omits it -> "ModuleNotFoundError: No module named 'pbr'".
+pbr;python_version > '3'
 responses
\ No newline at end of file
diff --git a/tox.ini b/tox.ini
index b8f353b..078af7b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py39,py310,py311,static,docs
+envlist = py310,py311,py312,static,docs
 
 [testenv]
 deps=-rtest-requirements.txt