diff --git a/requirements.txt b/requirements.txt
index 63aa297..af2e56a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 Flask_API==2.0
-cryptography==2.8
+cryptography==3.1
 Flask==1.1.2
 secrets==1.0.2
\ No newline at end of file