diff --git a/contrib/deterministic-build/requirements-hw.txt b/contrib/deterministic-build/requirements-hw.txt
index c6c56212..fc8c055d 100644
--- a/contrib/deterministic-build/requirements-hw.txt
+++ b/contrib/deterministic-build/requirements-hw.txt
@@ -9,7 +9,7 @@ idna==2.6
 keepkey==4.0.2
 libusb1==1.6.4
 mnemonic==0.18
-protobuf==3.5.2.post1
+protobuf==3.15.0
 pyblake2==1.1.2
 requests==2.18.4
 six==1.11.0
diff --git a/contrib/deterministic-build/requirements.txt b/contrib/deterministic-build/requirements.txt
index 9542dcdd..16e5f836 100644
--- a/contrib/deterministic-build/requirements.txt
+++ b/contrib/deterministic-build/requirements.txt
@@ -4,7 +4,7 @@ dnspython==1.15.0
 ecdsa==0.13
 idna==2.6
 jsonrpclib-pelix==0.3.1
-protobuf==3.5.2.post1
+protobuf==3.15.0
 pyaes==1.6.1
 PySocks==1.6.8
 qrcode==6.0