diff --git a/requirements-base.txt b/requirements-base.txt
index bbc02ed02..79a245fb2 100644
--- a/requirements-base.txt
+++ b/requirements-base.txt
@@ -90,7 +90,7 @@ requests-futures==1.0.0
 requests-mock==1.8.0
 rfc3987==1.3.8
 # rsa is an oauth2client dependency. 4.3 is the last version to support Python 2.
-rsa==4.3
+rsa==4.7
 s3transfer==0.5.2
 singledispatch==3.4.0.3
 snowballstemmer==2.0.0