diff --git a/Services_dev/BlendCAC/app/requirements.txt b/Services_dev/BlendCAC/app/requirements.txt
index 9235d8d..63ac1be 100644
--- a/Services_dev/BlendCAC/app/requirements.txt
+++ b/Services_dev/BlendCAC/app/requirements.txt
@@ -1,3 +1,3 @@
 Flask==1.0.0
 web3==3.16.5
-cryptography==2.4.2
+cryptography==3.3.2