diff --git a/paper_trail.gemspec b/paper_trail.gemspec
index 5484d8fae..1103430d0 100644
--- a/paper_trail.gemspec
+++ b/paper_trail.gemspec
@@ -42,7 +42,13 @@ Gem::Specification.new do |s|
     s.add_development_dependency "activerecord-jdbcmysql-adapter", "~> 1.3.15"
   else
     s.add_development_dependency "sqlite3", "~> 1.2"
-    s.add_development_dependency "pg", "~> 0.17"
+
+    # pg 0.19 requires ruby >= 2.0.0
+    if ::Gem.ruby_version >= ::Gem::Version.new("2.0.0")
+      s.add_development_dependency "pg", "~> 0.19.0"
+    else
+      s.add_development_dependency "pg", [">= 0.17", "< 0.19"]
+    end
 
     # activerecord >= 4.2.5 may use mysql2 >= 0.4
     s.add_development_dependency "mysql2", "~> 0.4.2"