diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6eaaca3..507de7a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -100,6 +100,7 @@ jobs:
             dependencies: [ pytest-doctestplus, pytest-openfiles, requests_mock ]
             env:
               CRDS_SERVER_URL: https://jwst-crds.stsci.edu
+            pytest_args: '--slow'
           #- package: nictools
           - package: poppy
             dependencies: [ pytest-astropy ]
@@ -174,7 +175,7 @@ jobs:
         with:
           path: 'tests/data/'
           key: data-${{ hashFiles('tests/data/*') }}
-      - run: pytest -n auto --slow ${{ matrix.pytest_args }} --pyargs ${{ matrix.package }}
+      - run: pytest -n auto ${{ matrix.pytest_args }} --pyargs ${{ matrix.package }}
         env:
           CRDS_SERVER_URL: ${{ matrix.env.CRDS_SERVER_URL }}
           CRDS_PATH: ${{ env.CRDS_PATH }}
@@ -201,6 +202,7 @@ jobs:
             test_directory: tests
             env:
               CRDS_SERVER_URL: https://hst-crds.stsci.edu
+            pytest_args: '--slow'
           #- package: stistools
           #  repository: spacetelescope/stistools
           - package: stsynphot
@@ -269,7 +271,7 @@ jobs:
         env:
           CRDS_SERVER_URL: ${{ matrix.env.CRDS_SERVER_URL }}
           CRDS_PATH: ${{ env.CRDS_PATH }}
-      - run: cd ${{ matrix.package }} && pytest -n auto --slow ${{ matrix.pytest_args }} ${{ matrix.test_directory }}
+      - run: cd ${{ matrix.package }} && pytest -n auto ${{ matrix.pytest_args }} ${{ matrix.test_directory }}
         env:
           CRDS_SERVER_URL: ${{ matrix.env.CRDS_SERVER_URL }}
           CRDS_PATH: ${{ env.CRDS_PATH }}