diff --git a/examples/count_people_in_zone/requirements.txt b/examples/count_people_in_zone/requirements.txt
index d9e27264..114447fc 100644
--- a/examples/count_people_in_zone/requirements.txt
+++ b/examples/count_people_in_zone/requirements.txt
@@ -1,5 +1,5 @@
 gdown
 inference
-supervision==0.19.0
+supervision>=0.20.0
 tqdm
 ultralytics
diff --git a/examples/speed_estimation/requirements.txt b/examples/speed_estimation/requirements.txt
index 36de970d..af2e1c13 100644
--- a/examples/speed_estimation/requirements.txt
+++ b/examples/speed_estimation/requirements.txt
@@ -1,4 +1,4 @@
-supervision==0.19.0
+supervision>=0.20.0
 tqdm==4.66.1
 requests
 ultralytics==8.0.237
diff --git a/examples/time_in_zone/inference_stream_example.py b/examples/time_in_zone/inference_stream_example.py
index 604aade4..0dfdf660 100644
--- a/examples/time_in_zone/inference_stream_example.py
+++ b/examples/time_in_zone/inference_stream_example.py
@@ -24,18 +24,15 @@ class CustomSink:
         self.fps_monitor = sv.FPSMonitor()
         self.polygons = load_zones_config(file_path=zone_configuration_path)
         self.timers = [ClockBasedTimer() for _ in self.polygons]
-        self.zones = None
+        self.zones = [
+            sv.PolygonZone(
+                polygon=polygon,
+                triggering_anchors=(sv.Position.CENTER,),
+            )
+            for polygon in self.polygons
+        ]
 
     def on_prediction(self, result: dict, frame: VideoFrame) -> None:
-        if self.zones is None:
-            self.zones = [
-                sv.PolygonZone(
-                    polygon=polygon,
-                    triggering_anchors=(sv.Position.CENTER,),
-                )
-                for polygon in self.polygons
-            ]
-
         self.fps_monitor.tick()
         fps = self.fps_monitor.fps
 
diff --git a/examples/time_in_zone/requirements.txt b/examples/time_in_zone/requirements.txt
index fa17b986..752b4a8f 100644
--- a/examples/time_in_zone/requirements.txt
+++ b/examples/time_in_zone/requirements.txt
@@ -1,5 +1,5 @@
 opencv-python
-supervision
+supervision>=0.20.0
 ultralytics
 inference
 pytube
diff --git a/examples/time_in_zone/ultralytics_stream_example.py b/examples/time_in_zone/ultralytics_stream_example.py
index 6262d594..8b8ecd60 100644
--- a/examples/time_in_zone/ultralytics_stream_example.py
+++ b/examples/time_in_zone/ultralytics_stream_example.py
@@ -25,18 +25,15 @@ class CustomSink:
         self.fps_monitor = sv.FPSMonitor()
         self.polygons = load_zones_config(file_path=zone_configuration_path)
         self.timers = [ClockBasedTimer() for _ in self.polygons]
-        self.zones = None
+        self.zones = [
+            sv.PolygonZone(
+                polygon=polygon,
+                triggering_anchors=(sv.Position.CENTER,),
+            )
+            for polygon in self.polygons
+        ]
 
     def on_prediction(self, detections: sv.Detections, frame: VideoFrame) -> None:
-        if self.zones is None:
-            self.zones = [
-                sv.PolygonZone(
-                    polygon=polygon,
-                    triggering_anchors=(sv.Position.CENTER,),
-                )
-                for polygon in self.polygons
-            ]
-
         self.fps_monitor.tick()
         fps = self.fps_monitor.fps
 
diff --git a/examples/traffic_analysis/requirements.txt b/examples/traffic_analysis/requirements.txt
index 6e72dd55..114447fc 100644
--- a/examples/traffic_analysis/requirements.txt
+++ b/examples/traffic_analysis/requirements.txt
@@ -1,5 +1,5 @@
 gdown
 inference
-supervision>=0.19.0
+supervision>=0.20.0
 tqdm
 ultralytics