diff --git a/.github/workflows/default-tests.yml b/.github/workflows/default-tests.yml
index 57bffd2d..3740d663 100644
--- a/.github/workflows/default-tests.yml
+++ b/.github/workflows/default-tests.yml
@@ -11,6 +11,11 @@ jobs:
       matrix:
         python-version: [ "3.10", "3.11", "3.12", "3.13" ]
         os: [ windows-latest, ubuntu-latest, macos-latest ]
+        cf_units: [ false ]
+        include:
+          - python-version: "3.10"
+            os: "ubuntu-latest"
+            cf_units: true
       fail-fast: false
     defaults:
       run:
@@ -30,6 +35,11 @@ jobs:
           --file test_requirements.txt
           --channel conda-forge
 
+    - name: Test with cf-units (faster)
+      if: matrix.cf_units == true
+      run: >-
+        micromamba install cf-units --channel conda-forge
+
     - name: Install compliance-checker
       run: |
         pip install git+https://github.com/pelson/pyudunits2.git@864e339d622656d060d910381510f9bfe7b17aab