diff --git a/Gemfile b/Gemfile
index 3c273ac..6eb968f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,4 +3,4 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in bing_ads_ruby_sdk.gemspec
 gemspec
 
-gem "standard", "1.32.1"
+gem "standard", "1.39.1"