diff --git a/Gemfile b/Gemfile
index 651a9cd9d65..7202eac82a0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -263,7 +263,7 @@ platforms :mri, :mingw, :x64_mingw do
   end
 
   group :postgres do
-    gem 'pg', '~> 0.21.0'
+    gem 'pg', '~> 1.0.0'
   end
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 92eb4dcffba..34ba2ee1485 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -379,7 +379,7 @@ GEM
       rack
       rake (>= 0.8.1)
     pdf-core (0.7.0)
-    pg (0.21.0)
+    pg (1.0.0)
     plaintext (0.1.0)
       activesupport (> 2.2.1)
       nokogiri (~> 1.8.1)
@@ -675,7 +675,7 @@ DEPENDENCIES
   openproject-translations!
   parallel_tests (~> 2.14.0)
   passenger (~> 5.2)
-  pg (~> 0.21.0)
+  pg (~> 1.0.0)
   plaintext (= 0.1.0)
   prawn (~> 2.2)
   prawn-table (~> 0.2.2)