diff --git a/backend/requirements.txt b/backend/requirements.txt
index 9fa1408..2ab3ed1 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -11,7 +11,7 @@ channels[daphne]==4.2.0
 whitenoise==6.8.2
 
 # Secrets / hashing
-argon2-cffi==23.1.0
+argon2-cffi==25.1.0
 pyotp==2.9.0
 
 # Phase 1 (Minecraft container management)