diff --git a/desk/docker/worker/requirements.txt b/desk/docker/worker/requirements.txt
index 5dedd7f..480cdf9 100644
--- a/desk/docker/worker/requirements.txt
+++ b/desk/docker/worker/requirements.txt
@@ -14,7 +14,7 @@ cffi==0.8.6
 coverage==3.7.1
 cssselect==0.9.1
 dnspython==1.12.0
-ecdsa==0.11
+ecdsa==0.13.3
 ezodf==0.2.5
 gevent==1.1.1
 greenlet==0.4.4