diff --git a/docs/Gemfile b/docs/Gemfile
index 951b2832b12..00c6a71b553 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -30,4 +30,4 @@ gem "wdm", "~> 0.2.0", :platforms => [:mingw, :x64_mingw, :mswin]
 # Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
 # do not have a Java counterpart.
 gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
-gem "webrick", "~> 1.7"
+gem "webrick", "~> 1.9"
diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 6b2be33b051..22bec7470cc 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -264,7 +264,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.8.0)
     uri (0.13.1)
-    webrick (1.8.2)
+    webrick (1.9.0)
 
 PLATFORMS
   x86_64-linux
@@ -276,7 +276,7 @@ DEPENDENCIES
   tzinfo (>= 1, < 3)
   tzinfo-data
   wdm (~> 0.2.0)
-  webrick (~> 1.7)
+  webrick (~> 1.9)
 
 BUNDLED WITH
    2.4.20