diff --git a/health_check/package.json b/health_check/package.json
index ad65b319..b68e8b1a 100644
--- a/health_check/package.json
+++ b/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "0.16.0-dev",
+  "version": "1.0.0-pre1",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
diff --git a/tools/package.json b/tools/package.json
index 7c256d7b..7efa0d3f 100644
--- a/tools/package.json
+++ b/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "0.16.0-dev",
+  "version": "1.0.0-pre1",
   "author": "Google Inc.",
   "description": "Tools for developing with gRPC on Node.js",
   "homepage": "http://www.grpc.io/",