diff --git a/requirements.txt b/requirements.txt
index 2024cf92..de15322d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ certifi==2016.02.28
 Crypto==2.6
 cycler==0.9.0
 dropbox==6.4.0
-ecdsa
+ecdsa==0.19.1
 et_xmlfile==1.0.1
 evernote
 faker