diff --git a/services/backend-api/app/Gemfile b/services/backend-api/app/Gemfile
index a801abc..51dc10f 100644
--- a/services/backend-api/app/Gemfile
+++ b/services/backend-api/app/Gemfile
@@ -1,9 +1,9 @@
 source 'https://rubygems.org'
 
 gem 'puma', '~> 4.3.3'
-gem 'rack', '~> 2.0.8'
-gem 'sinatra', '~> 2.0.7'
-gem 'sinatra-contrib', '~> 2.0.7'
+gem 'rack', '~> 2.2.4'
+gem 'sinatra', '~> 3.0.4'
+gem 'sinatra-contrib', '~> 3.0.4'
 gem 'redis', '~> 4.1.2'
 gem 'bunny', '~> 2.14.2'
 gem 'connection_pool', '~> 2.2.2'
@@ -17,6 +17,6 @@ gem 'statsd-ruby', '~> 1.4.0'
 
 # todo: put into separate :test bundle group
 group :test do
-  gem 'rack-test', '~> 1.1.0'
+  gem 'rack-test', '~> 2.0.2'
   gem 'minitest'
 end
diff --git a/services/backend-api/app/Gemfile.lock b/services/backend-api/app/Gemfile.lock
index 2955856..257abd4 100644
--- a/services/backend-api/app/Gemfile.lock
+++ b/services/backend-api/app/Gemfile.lock
@@ -2,38 +2,38 @@ GEM
   remote: https://rubygems.org/
   specs:
     amq-protocol (2.3.0)
-    backports (3.15.0)
     bunny (2.14.2)
       amq-protocol (~> 2.3, >= 2.3.0)
     concurrent-ruby (1.1.5)
     connection_pool (2.2.2)
     minitest (5.11.3)
-    multi_json (1.13.1)
-    mustermann (1.0.3)
+    multi_json (1.15.0)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.5.2)
     puma (4.3.3)
       nio4r (~> 2.0)
-    rack (2.0.8)
-    rack-protection (2.0.7)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
+    rack-test (2.0.2)
+      rack (>= 1.3)
     rake (12.3.3)
     redis (4.1.2)
+    ruby2_keywords (0.0.5)
     serverengine (2.0.7)
       sigdump (~> 0.2.2)
     sigdump (0.2.4)
-    sinatra (2.0.7)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.7)
-      backports (>= 2.8.2)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.7)
-      sinatra (= 2.0.7)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
     sneakers (2.11.0)
       bunny (~> 2.12)
@@ -43,7 +43,7 @@ GEM
       thor
     statsd-ruby (1.4.0)
     thor (0.20.3)
-    tilt (2.0.9)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -53,11 +53,11 @@ DEPENDENCIES
   connection_pool (~> 2.2.2)
   minitest
   puma (~> 4.3.3)
-  rack (~> 2.0.8)
-  rack-test (~> 1.1.0)
+  rack (~> 2.2.4)
+  rack-test (~> 2.0.2)
   redis (~> 4.1.2)
-  sinatra (~> 2.0.7)
-  sinatra-contrib (~> 2.0.7)
+  sinatra (~> 3.0.4)
+  sinatra-contrib (~> 3.0.4)
   sneakers (~> 2.11.0)
   statsd-ruby (~> 1.4.0)