diff --git a/contrib/deterministic-build/requirements-hw.txt b/contrib/deterministic-build/requirements-hw.txt
index 5052054..2693d8f 100644
--- a/contrib/deterministic-build/requirements-hw.txt
+++ b/contrib/deterministic-build/requirements-hw.txt
@@ -3,7 +3,7 @@ certifi==2018.1.18
 chardet==3.0.4
 click==6.7
 Cython==0.27.3
-ecdsa==0.13
+ecdsa==0.13.3
 hidapi==0.7.99.post21
 idna==2.6
 keepkey==4.0.2
diff --git a/contrib/deterministic-build/requirements.txt b/contrib/deterministic-build/requirements.txt
index 00be214..6e561e8 100644
--- a/contrib/deterministic-build/requirements.txt
+++ b/contrib/deterministic-build/requirements.txt
@@ -1,7 +1,7 @@
 certifi==2018.1.18
 chardet==3.0.4
 dnspython==1.15.0
-ecdsa==0.13
+ecdsa==0.13.3
 idna==2.6
 jsonrpclib-pelix==0.3.1
 pbkdf2==1.3