diff --git a/ch05/photolog/requirements.txt b/ch05/photolog/requirements.txt
index 37f6f05..aff7a80 100644
--- a/ch05/photolog/requirements.txt
+++ b/ch05/photolog/requirements.txt
@@ -3,7 +3,7 @@ charset-normalizer==2.0.4
 click==7.1.2
 dnspython==2.1.0
 email-validator==1.1.3
-Flask==0.12
+Flask==1.0
 greenlet==1.1.1
 idna==3.2
 itsdangerous==2.0.1