diff --git a/internal/proto/credential.proto b/internal/proto/credential.proto
index dd4b2570..c6ca1432 100644
--- a/internal/proto/credential.proto
+++ b/internal/proto/credential.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package nearby.internal;
 
diff --git a/internal/proto/device_metadata.proto b/internal/proto/device_metadata.proto
index d8ceb28c..b3acf374 100644
--- a/internal/proto/device_metadata.proto
+++ b/internal/proto/device_metadata.proto
@@ -1,4 +1,4 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package nearby.internal;