diff --git a/tools/buildchain/requirements.txt b/tools/buildchain/requirements.txt
index c858943..b4b5961 100644
--- a/tools/buildchain/requirements.txt
+++ b/tools/buildchain/requirements.txt
@@ -4,7 +4,7 @@ bdist-mpkg==0.5.0
 bonjour-py==0.3
 cffi==1.9.1
 cryptography==1.7.2
-ecdsa==0.13
+ecdsa==0.19.1
 enum34==1.1.6
 esptool==1.2.1
 Fabric3==1.13.1.post1