diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8156a34..8c6fa65 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,10 +31,6 @@ jobs:
         os: [ ubuntu-latest, macos-latest ]
     steps:
       - uses: actions/checkout@v3.0.2
-      - run: sed -i "s/python==3.9/python==${{ matrix.python }}.*/g" environment.yml
-        if: runner.os == 'Linux'
-      - run: sed -i "" "s/python==3.9/python==${{ matrix.python }}.*/g" environment.yml
-        if: runner.os == 'MacOS'
       - uses: actions/setup-python@v4.1.0
         with:
           python-version: ${{ matrix.python }}
@@ -65,8 +61,6 @@ jobs:
           use-only-tar-bz2: true
       - run: conda env export > asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}.yml
         if: runner.os == 'Linux'
-      - run: sed -i "s/asdf-tutorial-${{ runner.os }}-py${{ matrix.python }}-latest/asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}/g" asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}.yml
-        if: runner.os == 'Linux'
       - run: cat asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}.yml
         if: runner.os == 'Linux'
       - uses: actions/upload-artifact@v3.1.0
@@ -74,8 +68,8 @@ jobs:
         with:
           name: asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}.yml
           path: asdf-tutorial-py${{ matrix.python }}-v${{ steps.version.outputs.version }}.yml
-  unit_tests:
-    name: run `${{ matrix.package }}` unit tests (Python ${{ matrix.python }}, ${{ matrix.os }})
+  run_notebooks:
+    name: run notebooks (Python ${{ matrix.python }}, ${{ matrix.os }})
     needs: [ build ]
     runs-on: ${{ matrix.os }}
     strategy:
@@ -85,10 +79,6 @@ jobs:
         os: [ ubuntu-latest, macos-latest ]
     steps:
       - uses: actions/checkout@v3.0.2
-      - run: sed -i "s/python==3.9/python==${{ matrix.python }}.*/g" environment.yml
-        if: runner.os == 'Linux'
-      - run: sed -i "" "s/python==3.9/python==${{ matrix.python }}.*/g" environment.yml
-        if: runner.os == 'MacOS'
       - run: echo "::set-output name=date::$(date +'%Y%m%d')"
         id: date
       - uses: actions/cache@v3.0.5
diff --git a/environment.yml b/environment.yml
index b2f7955..90537d7 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,14 +2,13 @@ name: asdf-tutorial-env
 
 dependencies:
   - jupyter
-  - notebook >= 6.0
-  - matplotlib >= 3.2
-  - numpy >= 1.16
+  - matplotlib
+  - numpy
   - pip
   - python >= 3.9
   - pip:
       - asdf
       - asdf-astropy
       - asdf-standard
-      - astropy >= 4.2
-      - gwcs >= 0.16
+      - astropy
+      - gwcs