diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 1d9e7f8..85c99a4 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.10", "3.11"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -20,7 +20,7 @@ jobs:
       with:
         miniforge-variant: Mambaforge
         activate-environment: mamonca-test
-        channel-priority: strict
+        channel-priority: flexible
         environment-file: .ci_support/environment.yml
         python-version: ${{ matrix.python-version }}
         use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!