diff --git a/health_check/package.json b/health_check/package.json
index 6aa41522..30e6df6b 100644
--- a/health_check/package.json
+++ b/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "1.5.0-dev",
+  "version": "1.6.0-pre1",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
@@ -15,7 +15,7 @@
     }
   ],
   "dependencies": {
-    "grpc": "^1.5.0-dev",
+    "grpc": "^1.6.0-pre1",
     "lodash": "^3.9.3",
     "google-protobuf": "^3.0.0"
   },
diff --git a/tools/package.json b/tools/package.json
index 0a3c3273..2a5c1723 100644
--- a/tools/package.json
+++ b/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "1.5.0-dev",
+  "version": "1.6.0-pre1",
   "author": "Google Inc.",
   "description": "Tools for developing with gRPC on Node.js",
   "homepage": "https://grpc.io/",