diff --git a/requirements.txt b/requirements.txt
index 528847c..4fbe337 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 Flask==1.1.1
 requests==2.22.0
 simplejson==3.17.0
-vyper==0.2.12
+vyper==0.3.9
 web3==5.5.0