diff --git a/pip-sample/requirements.txt b/pip-sample/requirements.txt
index 74d37475..4fd1717f 100644
--- a/pip-sample/requirements.txt
+++ b/pip-sample/requirements.txt
@@ -6,7 +6,7 @@ cycler==0.10.0
 decorator==4.3.0
 defusedxml==0.5.0
 entrypoints==0.2.3
-Flask==1.0.2
+Flask==2.2.5
 google==2.0.1
 google-cloud==0.34.0
 gtfs-realtime-bindings==0.0.5