diff --git a/requirements.txt b/requirements.txt
index a800e39..7167de6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ pyasn1-modules==0.2.1
 pytesseract==0.2.0
 pytz==2017.3
 requests==2.18.4
-rsa==3.4.2
+rsa==4.7
 scipy==1.0.0
 six==1.11.0
 urllib3==1.22