diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index eb7d934b..671d94ba 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -9,4 +9,7 @@ jobs:
     steps:
       - name: Check out source repository
         uses: actions/checkout@v3
-      - uses: chartboost/ruff-action@v1
+      - uses: astral-sh/ruff-action@v3
+        # this runs `ruff check`
+      - run: ruff format --check
+        # this runs `ruff format --check`, additionally
diff --git a/README.md b/README.md
index 470a1c99..e8965555 100644
--- a/README.md
+++ b/README.md
@@ -194,6 +194,8 @@ Examples for translatable strings are `_("This is a string")` in Python code, or
 
 To ensure the new strings are well-formed, you can use `python validate_po.py --validate`.
 
+To ensure that the coding and formatting guidelines are followed, install [ruff](https://docs.astral.sh/ruff/) and run `ruff check` and `ruff format --check` to check for issues, as well as `ruff check --fix` and `ruff format` to autofix them.
+
 ## How to Release?
 
 0. Run `update-po.sh` to generate new translation files (which will be eventually updated by translators). Commit and push the changes to the master branch.
diff --git a/safeeyes/plugins/donotdisturb/plugin.py b/safeeyes/plugins/donotdisturb/plugin.py
index 1dfc3f54..9fb7be93 100644
--- a/safeeyes/plugins/donotdisturb/plugin.py
+++ b/safeeyes/plugins/donotdisturb/plugin.py
@@ -83,7 +83,7 @@ def get_active_window(x11_display):
         active_windows = get_window_property(root, NET_ACTIVE_WINDOW, Xlib.Xatom.WINDOW)
         if active_windows and active_windows[0]:
             active_window = active_windows[0]
-            return x11_display.create_resource_object('window', active_window)
+            return x11_display.create_resource_object("window", active_window)
         return None
 
     x11_display = Xlib.display.Display()