diff --git a/backend/requirements.txt b/backend/requirements.txt
index 33995b6..95d612e 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -8,7 +8,7 @@ saq[redis]>=0.22,<1.0
 httpx==0.28.1
 pillow==12.2.0
 thumbhash==0.1.2
-cryptography==48.0.1
+cryptography==50.0.0
 pixivpy3==3.7.5
 pydantic-settings==2.14.2
 python-multipart==0.0.31