diff --git a/Gemfile b/Gemfile
index aaa7fb4..f17e78b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gem 'thor'
 gem "mongoid", "~> 6.4"
 gem 'erubis', '~> 2.7.0'
 gem 'puma'
-gem 'sinatra', '~> 2.0'
+gem 'sinatra', '~> 2.2'
 gem 'sinatra-contrib', '~> 2.0'
 gem 'padrino-helpers', '>= 0.10.3'
 gem 'kaminari-mongoid'
diff --git a/Gemfile.lock b/Gemfile.lock
index e49a482..962c789 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,7 @@ GEM
       mongo (>= 2.5.1, < 3.0.0)
     multi_json (1.15.0)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.7)
     nokogiri (1.11.4)
@@ -73,10 +73,10 @@ GEM
     puma (5.3.1)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.4)
     rack-flash3 (1.0.5)
       rack
-    rack-protection (2.1.0)
+    rack-protection (2.2.3)
       rack
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
@@ -86,17 +86,17 @@ GEM
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
     rake (13.0.3)
-    ruby2_keywords (0.0.2)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.1.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.1.0)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.1.0)
-      sinatra (= 2.1.0)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
       tilt (~> 2.0)
     slack-ruby-client (0.14.6)
       activesupport
@@ -107,7 +107,7 @@ GEM
       websocket-driver
     thor (1.0.1)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     twilio-ruby (5.7.2)
       faraday (~> 0.9)
       jwt (>= 1.5, <= 2.5)
@@ -141,7 +141,7 @@ DEPENDENCIES
   rack-flash3
   rack-test (~> 1.0.0)
   rake
-  sinatra (~> 2.0)
+  sinatra (~> 2.2)
   sinatra-contrib (~> 2.0)
   slack-ruby-client
   thor