diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 04682da..6984ab2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
         os: [ubuntu-26.04]
         include:
           - python-version: "3.14"
@@ -30,6 +30,7 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:
+          allow-prereleases: true
           python-version: ${{ matrix.python-version }}
       - name: Install uv and set the python version
         uses: astral-sh/setup-uv@v7
@@ -64,7 +65,7 @@ jobs:
     env:
       UV_SYSTEM_PYTHON: 1
     runs-on: ubuntu-latest
-    container: icecube/icetray:icetray-devel-current-ubuntu22.04-X64
+    container: icecube/icetray:icetray-devel-current-ubuntu22.04
     strategy:
       fail-fast: false
     steps:
@@ -74,7 +75,9 @@ jobs:
         with:
           enable-cache: true
       - name: Install SimWeights
-        run: uv pip install -e .[test]
+        run: |
+          uv pip install 'pytest<8'
+          uv pip install -e .[test]
       - name: Download Test Data
         run: |
           curl -u icecube:${{ secrets.ICECUBE_PASSWORD }} https://convey.icecube.wisc.edu/data/ana/Software/simweights/test-data/simweights_testdata.tar.gz -O