diff --git a/Gemfile b/Gemfile
index fe095fbc..3e0a23a0 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', '2.2.0'
 gem 'nokogiri', '1.10.8'
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/Gemfile.lock b/Gemfile.lock
index 1391e099..bf6e6feb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
     multi_json (1.14.1)
-    mustermann (1.1.0)
+    mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
@@ -81,7 +81,7 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (4.0.1)
     rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
     rake (13.0.1)
     rb-fsevent (0.10.3)
@@ -91,7 +91,7 @@ GEM
     rouge (3.13.0)
     ruby-enum (0.7.2)
       i18n
-    ruby2_keywords (0.0.1)
+    ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
     sass (3.4.25)
     sass-globbing (1.1.5)
@@ -100,10 +100,10 @@ GEM
       ffi (~> 1.9)
     sassc (2.2.1-x64-mingw32)
       ffi (~> 1.9)
-    sinatra (2.0.8.1)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     stringex (2.8.5)
     terminal-table (1.8.0)
@@ -130,7 +130,7 @@ DEPENDENCIES
   nokogiri (= 1.10.8)
   rake (= 13.0.1)
   sass-globbing (= 1.1.5)
-  sinatra (= 2.0.8.1)
+  sinatra (= 2.2.0)
   stringex (= 2.8.5)
   tzinfo (~> 2.0)
   tzinfo-data