diff --git a/requirements.txt b/requirements.txt
index 87132a4..8d099f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Fabric==1.10.0
 PyYAML==3.11
 cov-core==1.15.0
 coverage==3.7.1
-ecdsa==0.11
+ecdsa==0.13.3
 paramiko==1.15.1
 py==1.4.26
 pycrypto==2.6.1