diff --git a/Gemfile b/Gemfile
index 6add7b4f..efd1a86d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ gem 'redcarpet', github: 'vmg/redcarpet', ref: 'cef9abbcc411d07fd1b8c80e348a80ef
 gem 'sass'
 
 gem 'slim'
-gem 'yard', '~> 0.8.6.2'
+gem 'yard', '~> 0.9.20'
 
 # We need to use 2.0.9 and not 2.0.10 because of a regression.
 # See: https://github.com/rtomayko/tilt/issues/347
diff --git a/Gemfile.lock b/Gemfile.lock
index 971577db..271d43bc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -218,7 +218,7 @@ GEM
       nanaimo (~> 0.3.0)
       rexml (~> 3.2.4)
     yajl-ruby (1.2.3)
-    yard (0.8.6.2)
+    yard (0.9.20)
 
 PLATFORMS
   ruby
@@ -242,7 +242,7 @@ DEPENDENCIES
   slim
   therubyracer
   tilt (= 2.0.9)
-  yard (~> 0.8.6.2)
+  yard (~> 0.9.20)
 
 BUNDLED WITH
    2.2.8