diff --git a/examples/CH_09/requirements.txt b/examples/CH_09/requirements.txt
old mode 100755
new mode 100644
index 3c78ddd..72c881e
--- a/examples/CH_09/requirements.txt
+++ b/examples/CH_09/requirements.txt
@@ -6,7 +6,7 @@ certifi==2022.12.7
 cffi==1.15.0
 charset-normalizer==2.0.12
 click==8.0.4
-cryptography==39.0.1
+cryptography==41.0.3
 cssselect==1.1.0
 cssutils==2.3.0
 dnspython==2.2.0