diff --git a/Gemfile b/Gemfile
index d08dc27dd..cf30d1d96 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '5.0.5'
-gem 'webpacker'
+gem 'webpacker', '~> 4.0.2'
 
 gem 'pg', '~> 0.21'
 gem 'activerecord-postgis-adapter', '~> 4.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 60a5a3684..41a7aef60 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1170,7 +1170,7 @@ DEPENDENCIES
   uglifier (~> 2.7.2)
   vuejs-rails (~> 2.3.2)
   webmock (~> 1.22.0)
-  webpacker
+  webpacker (~> 4.0.2)
   whenever
   will_paginate (~> 3.0)