diff --git a/.github/workflows/ci_testing.yml b/.github/workflows/ci_testing.yml
index 71fbd853000d0a3a67527f89d64f847249e00165..a26481cd5785cf876c59fffc54efc8f585feee67 100644
--- a/.github/workflows/ci_testing.yml
+++ b/.github/workflows/ci_testing.yml
@@ -14,8 +14,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-       os: [ubuntu-latest, macos-latest]
-       python-version: ["3.8", "3.9", "3.10", "3.11"]
+       os: [ubuntu-latest, macos-13]
+       python-version: ["3.9", "3.10", "3.11"]
     defaults:
       run:
         shell: bash -l {0}
@@ -23,9 +23,8 @@ jobs:
       - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           submodules: true
-      - uses: conda-incubator/setup-miniconda@3b0f2504dd76ef23b6d31f291f4913fb60ab5ff3
+      - uses: conda-incubator/setup-miniconda@d2e6a045a86077fb6cad6f5adf368e9076ddaa8d
         with:
-          miniforge-version: latest
           use-mamba: true
           channels: conda-forge
           activate-environment: ale