diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7c0c1069..ea46cad0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -3,9 +3,6 @@ name: CI
 on:
   push:
     branches:
-      - master
-      - 'test*'
-      - 'alltest*'
       - 'action*'
     tags:
       - '*'
@@ -29,7 +26,12 @@ jobs:
           - name: "Latest Python 3.12"
             os: ubuntu-latest
             python-version: 3.12
-
+          - name: "OS X Python 3.8"
+            os: macos-latest
+            python-version: 3.8
+          - name: "Windows Python 3.12"
+            os: windows-latest
+            python-version: 3.12
     steps:
     - run: gfortran --version
 
@@ -75,8 +77,8 @@ jobs:
     - name: Install dependencies (Anaconda)
       if: matrix.pydist == 'ANACONDA'
       run: |
-        conda install scipy matplotlib cython PyYAML dill coverage pytest pandas mpi4py openmpi
-        conda install -c conda-forge iminuit
+        conda install -y scipy matplotlib cython PyYAML dill coverage pytest pandas mpi4py openmpi
+        conda install -y -c conda-forge iminuit
         pip install -r requirements.txt flake8 flaky pytest-xdist pytest-cov camb
 
     - name: Run flake8