diff --git a/Gemfile b/Gemfile
index 0a80e40..a7c205b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -70,7 +70,7 @@ end
 
 group :production do
   # Postgres on Heroku in production
-  gem 'pg'
+  gem 'pg', '0.21.0'
   gem 'rails_12factor' # For heroku
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 79f5ae1..ad73363 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -274,7 +274,7 @@ DEPENDENCIES
   jbuilder (~> 2.7)
   jquery-form-validator-rails
   jquery-rails
-  pg
+  pg (= 0.21.0)
   poltergeist
   rack-google-analytics
   rails (~> 4.2)
@@ -295,4 +295,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.14.6
+   1.16.2