diff --git a/stub/api/Gemfile b/stub/api/Gemfile
index 9d7f38be..478863f5 100644
--- a/stub/api/Gemfile
+++ b/stub/api/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 ruby '2.5.5'
-gem 'sinatra', '~> 2.0.1', require: false
+gem 'sinatra', '~> 2.2.3', require: false
 
 group :test do
   gem 'activemodel'
diff --git a/stub/api/Gemfile.lock b/stub/api/Gemfile.lock
index 0abba6a2..e64501de 100644
--- a/stub/api/Gemfile.lock
+++ b/stub/api/Gemfile.lock
@@ -17,9 +17,10 @@ GEM
       concurrent-ruby (~> 1.0)
     json (2.1.0)
     minitest (5.11.3)
-    mustermann (1.0.3)
-    rack (2.0.6)
-    rack-protection (2.0.5)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -36,18 +37,19 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
+    ruby2_keywords (0.0.5)
     simplecov (0.17.0)
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
 
@@ -59,7 +61,7 @@ DEPENDENCIES
   codacy-coverage
   rack-test
   rspec
-  sinatra (~> 2.0.1)
+  sinatra (~> 2.2.3)
 
 RUBY VERSION
    ruby 2.5.5p157