diff --git a/requirements.txt b/requirements.txt
index 68f6df5..2110f04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ python3-openid==3.1.0
 pytz==2018.9
 requests==2.21.0
 requests-oauthlib==1.2.0
-s3transfer==0.2.0
+s3transfer==0.3.3
 simplegeneric==0.8.1
 six==1.12.0
 traitlets==4.3.2