diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 23e1db0b..95bff95e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -55,9 +55,6 @@ jobs:
           sudo apt-get update
           sudo apt-get install graphviz graphviz-dev
 
-      - if: matrix.os == 'macos-latest'
-        run: brew install graphviz
-
       # Unit, integration, and end-to-end tests.
 
       - name: Run unit tests and doctests.
diff --git a/.github/workflows/update-plugin-list.yml b/.github/workflows/update-plugin-list.yml
index aa7dff8d..38005544 100644
--- a/.github/workflows/update-plugin-list.yml
+++ b/.github/workflows/update-plugin-list.yml
@@ -37,7 +37,7 @@ jobs:
         run: python scripts/update_plugin_list.py
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@9153d834b60caba6d51c9b9510b087acf9f33f83
+        uses: peter-evans/create-pull-request@6d6857d36972b65feb161a90e484f2984215f83e
         with:
           commit-message: '[automated] Update plugin list'
           author: 'Tobias Raabe <tobiasraabe@users.noreply.github.com>'
diff --git a/tests/test_dag_command.py b/tests/test_dag_command.py
index ef05c82b..eef35d96 100644
--- a/tests/test_dag_command.py
+++ b/tests/test_dag_command.py
@@ -19,7 +19,7 @@
 # Test should run always on remote except on Windows and locally only with the package
 # installed.
 _TEST_SHOULD_RUN = _IS_PYGRAPHVIZ_INSTALLED or (
-    os.environ.get("CI") and sys.platform != "win32"
+    os.environ.get("CI") and sys.platform == "linux"
 )
 _GRAPH_LAYOUTS = ["neato", "dot", "fdp", "sfdp", "twopi", "circo"]
 _TEST_FORMATS = ["dot", "pdf", "png", "jpeg", "svg"]
diff --git a/tox.ini b/tox.ini
index 4e82bf7f..295636f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,6 @@ commands =
 [testenv:test]
 extras = test
 deps =
-    pygraphviz;platform_system != "Windows"
+    pygraphviz;platform_system == "Linux"
 commands =
     pytest --nbmake {posargs}