diff --git a/py-build/requirements.txt b/py-build/requirements.txt
index 830b42a3..4eea933e 100644
--- a/py-build/requirements.txt
+++ b/py-build/requirements.txt
@@ -4,7 +4,7 @@ botocore==1.12.243
 certifi==2019.9.11
 chardet==3.0.4
 docutils==0.15.2
-ecdsa==0.13.2
+ecdsa==0.13.3
 future==0.17.1
 idna==2.8
 isort==4.3.21