diff --git a/blockchain/requirements.txt b/blockchain/requirements.txt
index 058119f..6ab493f 100644
--- a/blockchain/requirements.txt
+++ b/blockchain/requirements.txt
@@ -16,7 +16,7 @@ sqlalchemy==1.4.25
 pandas==1.3.5
 
 # Security dependencies
-cryptography==3.4.7
+cryptography==42.0.4
 pycryptodome==3.10.1
 
 # Testing dependencies