diff --git a/Gemfile b/Gemfile
index 8de1d420268b..692280678bd7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ group :jekyll_plugins do
   gem 'jekyll-commonmark', '1.3.1'
 end
 
-gem 'sinatra', '2.0.8.1'
+gem 'sinatra', '3.0.4'
 gem 'nokogiri', '1.10.9'
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/Gemfile.lock b/Gemfile.lock
index 627ff3d06ef9..7dd1f25a453d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
     multi_json (1.14.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
@@ -79,8 +79,8 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.3)
-    rack (2.2.2)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rake (13.0.1)
     rb-fsevent (0.10.3)
@@ -89,7 +89,7 @@ GEM
     rouge (3.17.0)
     ruby-enum (0.8.0)
       i18n
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
     sass (3.4.25)
     sass-globbing (1.1.5)
@@ -98,15 +98,15 @@ GEM
       ffi (~> 1.9)
     sassc (2.2.1-x64-mingw32)
       ffi (~> 1.9)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     stringex (2.8.5)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (2.0.1)
       concurrent-ruby (~> 1.0)
     tzinfo-data (1.2019.3)
@@ -128,7 +128,7 @@ DEPENDENCIES
   nokogiri (= 1.10.9)
   rake (= 13.0.1)
   sass-globbing (= 1.1.5)
-  sinatra (= 2.0.8.1)
+  sinatra (= 3.0.4)
   stringex (= 2.8.5)
   tzinfo (~> 2.0)
   tzinfo-data