diff --git a/packages/grpc-native-core/build.yaml b/packages/grpc-native-core/build.yaml
index 49e36fdf..184e37a5 100644
--- a/packages/grpc-native-core/build.yaml
+++ b/packages/grpc-native-core/build.yaml
@@ -1,2 +1,3 @@
 settings:
   '#': It's possible to have node_version here as a key to override the core's version.
+  node_version: 1.12.1-pre1
diff --git a/packages/grpc-native-core/package.json b/packages/grpc-native-core/package.json
index 801b5fae..a1b69c48 100644
--- a/packages/grpc-native-core/package.json
+++ b/packages/grpc-native-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "1.12.0",
+  "version": "1.12.1-pre1",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "https://grpc.io/",