diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index cfdd2c2..7e64334 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -29,7 +29,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        package: [ acstools, asdf, calcos, ccdproc, costools, jwst, reftools, synphot, wfpc2tools ]
+        package: [ acstools, asdf, ccdproc, costools, jwst, reftools, synphot, wfpc2tools ]
         # the macOS 13 runner is on Intel hardware
         runs-on: [ ubuntu-latest, macos-13, macos-latest ]
         python-version: [ '3.10', '3.11', '3.12' ]
@@ -40,9 +40,6 @@ jobs:
           - package: asdf
             extras: [ all, tests ]
             pytest-args: --remote-data --durations=10
-          - package: calcos
-            extras: [ test ]
-            pytest-args: --slow
           - package: ccdproc
             extras: [ test ]
             pytest-args: -W ignore
@@ -103,11 +100,15 @@ jobs:
     needs: [ build, crds_contexts ]
     strategy:
       matrix:
-        package: [ hstcal ]
+        package: [ hstcal, calcos ]
         # the macOS 13 runner is on Intel hardware
         runs-on: [ ubuntu-latest, macos-13, macos-latest ]
         python-version: [ '3.10', '3.11', '3.12' ]
         include:
+          - package: calcos
+            repository: spacetelescope/calcos
+            extras: [ test ]
+            pytest-args: --slow
           #- package: drizzlepac
           #  repository: spacetelescope/drizzlepac
           #  extras: [ test ]