diff --git a/contrib/requirements.txt b/contrib/requirements.txt
index 274a385d9fdb..05f5ecdc881e 100644
--- a/contrib/requirements.txt
+++ b/contrib/requirements.txt
@@ -1,7 +1,7 @@
 certifi==2017.11.5
 chardet==3.0.4
 dnspython==1.15.0
-ecdsa==0.13
+ecdsa==0.13.3
 idna==2.6
 jsonrpclib-pelix==0.3.1
 pbkdf2==1.3