diff --git a/Gemfile b/Gemfile
index 2f27c87fa727..98017285e8a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,5 +18,5 @@ group :jekyll_plugins do
   gem 'jekyll-commonmark', '1.3.1'
 end
 
-gem 'sinatra', '2.0.7'
+gem 'sinatra', '3.0.5'
 gem 'nokogiri', '1.10.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index baa5809420aa..caf2c5ebb48d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,14 +69,15 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
     multi_json (1.13.1)
-    mustermann (1.0.3)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.1)
-    rack (2.0.7)
-    rack-protection (2.0.7)
+    rack (2.2.4)
+    rack-protection (3.0.5)
       rack
     rake (12.3.3)
     rb-fsevent (0.10.3)
@@ -85,6 +86,7 @@ GEM
     rouge (3.9.0)
     ruby-enum (0.7.2)
       i18n
+    ruby2_keywords (0.0.5)
     ruby_dep (1.5.0)
     safe_yaml (1.0.5)
     sass (3.4.25)
@@ -92,15 +94,15 @@ GEM
       sass (>= 3.1)
     sassc (2.2.0)
       ffi (~> 1.9)
-    sinatra (2.0.7)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+    sinatra (3.0.5)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.5)
       tilt (~> 2.0)
     stringex (2.8.5)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    tilt (2.0.9)
+    tilt (2.0.11)
     unicode-display_width (1.6.0)
 
 PLATFORMS
@@ -117,7 +119,7 @@ DEPENDENCIES
   nokogiri (= 1.10.4)
   rake (= 12.3.3)
   sass-globbing (= 1.1.5)
-  sinatra (= 2.0.7)
+  sinatra (= 3.0.5)
   stringex (= 2.8.5)
 
 RUBY VERSION