diff --git a/docs/Gemfile b/docs/Gemfile
index 3acf8db..4c7c42c 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -4,7 +4,7 @@ group :development, :test do
   gem 'jekyll', '~> 4.2.1'
   gem 'jekyll-seo-tag', '~> 2.7.1'
   gem 'jekyll-sitemap', '~> 1.4.0'
-  gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform?
+  gem 'wdm', '~> 0.2.0', :install_if => Gem.win_platform?
 end
 
 
diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index a4536fa..b4acf6f 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -64,7 +64,7 @@ GEM
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.8.0)
-    wdm (0.1.1)
+    wdm (0.2.0)
     webrick (1.7.0)
 
 PLATFORMS
@@ -75,7 +75,7 @@ DEPENDENCIES
   jekyll (~> 4.2.1)
   jekyll-seo-tag (~> 2.7.1)
   jekyll-sitemap (~> 1.4.0)
-  wdm (~> 0.1.1)
+  wdm (~> 0.2.0)
   webrick (~> 1.7)
 
 BUNDLED WITH