diff --git a/contrib/deterministic-build/requirements-hw.txt b/contrib/deterministic-build/requirements-hw.txt
index c6c56212..610796b5 100644
--- a/contrib/deterministic-build/requirements-hw.txt
+++ b/contrib/deterministic-build/requirements-hw.txt
@@ -3,7 +3,7 @@ certifi==2018.4.16
 chardet==3.0.4
 click==6.7
 Cython==0.28.3
-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 9542dcdd..44ff9cbe 100644
--- a/contrib/deterministic-build/requirements.txt
+++ b/contrib/deterministic-build/requirements.txt
@@ -1,7 +1,7 @@
 certifi==2018.4.16
 chardet==3.0.4
 dnspython==1.15.0
-ecdsa==0.13
+ecdsa==0.13.3
 idna==2.6
 jsonrpclib-pelix==0.3.1
 protobuf==3.5.2.post1