diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 4722d2bb..60885ace 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -15,7 +15,7 @@ jobs:
         id: setup-fortran
         with:
           compiler: gcc
-          version: 11
+          version: 8
 
       - run: ${{ env.FC }} --version
         env:
@@ -37,7 +37,9 @@ jobs:
         env:
           # Disable building for PyPy and 32bit.
           CIBW_SKIP: pp* *-win32 *-manylinux_i686 *musllinux*
-          CIBW_BUILD_VERBOSITY: 1
+          CIBW_TEST_REQUIRES: scipy sympy
+          CIBW_TEST_COMMAND: python -m unittest camb.tests.camb_test
+          CIBW_BUILD_VERBOSITY: 2
 
       - uses: actions/upload-artifact@v4
         with: