diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0e5fccc..70ade69 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,21 +4,21 @@
 
 repos:
   - repo: https://github.com/python/black
-    rev: 22.3.0
+    rev: 23.3.0
     hooks:
       - id: black
   - repo: https://github.com/fsfe/reuse-tool
-    rev: v0.14.0
+    rev: v1.1.2
     hooks:
       - id: reuse
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.2.0
+    rev: v4.4.0
     hooks:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/pycqa/pylint
-    rev: v2.15.5
+    rev: v2.17.4
     hooks:
       - id: pylint
         name: pylint (library code)
diff --git a/examples/ov5640_directio_kaluga1_3_ili9341.py b/examples/ov5640_directio_kaluga1_3_ili9341.py
index 4069a07..346fda4 100644
--- a/examples/ov5640_directio_kaluga1_3_ili9341.py
+++ b/examples/ov5640_directio_kaluga1_3_ili9341.py
@@ -176,6 +176,9 @@ def test_modes(cam_obj):
 
 
 def main():
+    deadline = 0
+    effects = iter((None,))
+
     display.auto_refresh = False
     display_bus.send(42, struct.pack(">hh", 0, bitmap.width - 1))
     display_bus.send(43, struct.pack(">hh", 0, bitmap.height - 1))