diff --git a/images/pwn_python/requirements.txt b/images/pwn_python/requirements.txt
index be472cb..3089d4d 100644
--- a/images/pwn_python/requirements.txt
+++ b/images/pwn_python/requirements.txt
@@ -1,2 +1,2 @@
-Flask
+Flask==2.1.0
 Flask-BasicAuth