diff --git a/.github/workflows/test_and_build.yaml b/.github/workflows/test_and_build.yaml
index 4dd91349..da3ffe85 100644
--- a/.github/workflows/test_and_build.yaml
+++ b/.github/workflows/test_and_build.yaml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "macos-latest"]
-        python-version: ["3.11"]
+        python-version: ["3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
       - uses: conda-incubator/setup-miniconda@v3
@@ -29,7 +29,7 @@ jobs:
           auto-update-conda: true
           python-version: ${{ matrix.python-version }}
           miniforge-variant: Miniforge3
-          channels: conda-forge,defaults
+          channels: conda-forge
           use-mamba: true
           channel-priority: strict
           show-channel-urls: true