diff --git a/requirements.txt b/requirements.txt
index e85ed37..6ca0ada 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ pyasn1==0.3.6
 pyasn1-modules==0.1.4
 python-dotenv==0.7.1
 requests==2.18.4
-rsa==3.4.2
+rsa==4.1
 six==1.11.0
 slackbot==0.5.1
 slacker==0.9.60