diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 7568908..9ea3b89 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -60,8 +60,6 @@ jobs:
   lint:
     name: Python lint
     runs-on: ubuntu-latest
-    container:
-      image: python:3.12-slim
     steps:
       - uses: actions/checkout@v4
 
@@ -74,20 +72,25 @@ jobs:
   test:
     name: Python tests
     runs-on: ubuntu-latest
-    container:
-      image: python:3.12-slim
     steps:
       - uses: actions/checkout@v4
 
-      # git is required by setuptools-scm during package build
-      - name: Install git
-        run: apt-get update -qq && apt-get install -y -qq git
+      # The act runner base image ships Ubuntu 22.04 with Python 3.10.
+      # Our package requires 3.12, so install it from the deadsnakes PPA.
+      - name: Install Python 3.12
+        run: |
+          apt-get update -qq
+          apt-get install -y -qq software-properties-common
+          add-apt-repository -y ppa:deadsnakes/ppa
+          apt-get update -qq
+          apt-get install -y -qq python3.12 python3.12-dev python3.12-venv python3-pip git
+          python3.12 -m ensurepip --upgrade
 
       - name: Install package with dev deps
-        run: pip install -e ".[dev]"
+        run: python3.12 -m pip install -e ".[dev]"
 
       - name: Run tests
-        run: pytest tests/ -v
+        run: python3.12 -m pytest tests/ -v
 
   build:
     name: Build & push image