diff --git a/Gemfile b/Gemfile
index 5d7f956..599254f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ gem 'elasticsearch', '~> 1.0', require: false
 ## REST API
 gem 'pliny', '~> 0.17.0'
 gem 'dotenv'
-gem 'grape', '~> 0.9.0'
+gem 'grape', '~> 1.4.0'
 gem 'warden', '~> 1.2.3' # authentication middleware
 gem 'faraday', '~> 0.9.0'
 gem 'faraday_middleware', '~> 0.10.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5b518b9..784d6de 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,15 +25,11 @@ GEM
     ansi (1.5.0)
     ast (2.3.0)
     awesome_print (1.7.0)
-    axiom-types (0.1.1)
-      descendants_tracker (~> 0.0.4)
-      ice_nine (~> 0.11.0)
-      thread_safe (~> 0.3, >= 0.3.1)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
     bogus (0.1.6)
       dependor (>= 0.0.4)
-    builder (3.2.3)
+    builder (3.2.4)
     byebug (9.0.6)
     celluloid (0.17.3)
       celluloid-essentials
@@ -58,14 +54,13 @@ GEM
     codeclimate-test-reporter (1.0.8)
       simplecov (<= 0.13)
     coderay (1.1.1)
-    coercible (1.0.0)
-      descendants_tracker (~> 0.0.1)
     committee (1.15.0)
       json_schema (~> 0.6, >= 0.6.1)
       rack (>= 1.5)
     concord (0.1.5)
       adamantium (~> 0.2.0)
       equalizer (~> 0.0.9)
+    concurrent-ruby (1.1.7)
     corefines (1.9.0)
     coveralls (0.8.19)
       json (>= 1.8, < 3)
@@ -76,11 +71,31 @@ GEM
     database_cleaner (1.6.1)
     debug_inspector (0.0.3)
     dependor (1.0.1)
-    descendants_tracker (0.0.4)
-      thread_safe (~> 0.3, >= 0.3.1)
     diff-lcs (1.2.5)
     docile (1.1.5)
     dotenv (2.2.1)
+    dry-configurable (0.11.6)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.4, >= 0.4.7)
+      dry-equalizer (~> 0.2)
+    dry-container (0.7.2)
+      concurrent-ruby (~> 1.0)
+      dry-configurable (~> 0.1, >= 0.1.3)
+    dry-core (0.4.9)
+      concurrent-ruby (~> 1.0)
+    dry-equalizer (0.3.0)
+    dry-inflector (0.2.0)
+    dry-logic (1.0.8)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.2)
+      dry-equalizer (~> 0.2)
+    dry-types (1.4.0)
+      concurrent-ruby (~> 1.0)
+      dry-container (~> 0.3)
+      dry-core (~> 0.4, >= 0.4.4)
+      dry-equalizer (~> 0.3)
+      dry-inflector (~> 0.1, >= 0.1.2)
+      dry-logic (~> 1.0, >= 1.0.2)
     elasticsearch (1.1.2)
       elasticsearch-api (= 1.1.2)
       elasticsearch-transport (= 1.1.2)
@@ -111,16 +126,13 @@ GEM
     foreman (0.84.0)
       thor (~> 0.19.1)
     formatador (0.2.5)
-    grape (0.9.0)
+    grape (1.4.0)
       activesupport
       builder
-      hashie (>= 2.1.0)
-      multi_json (>= 1.3.2)
-      multi_xml (>= 0.5.2)
+      dry-types (>= 1.1)
+      mustermann-grape (~> 1.0.0)
       rack (>= 1.3.0)
       rack-accept
-      rack-mount
-      virtus (>= 1.0.0)
     guard (2.14.1)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
@@ -147,11 +159,11 @@ GEM
     guard-yard (2.2.0)
       guard (>= 1.1.0)
       yard (>= 0.7.0)
-    hashie (3.5.5)
     hitimes (1.2.5)
     http_accept (0.1.6)
     http_parser.rb (0.6.0)
-    i18n (0.8.4)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     icalendar (2.3.0)
     ice_cube (0.16.3)
     ice_nine (0.11.2)
@@ -181,10 +193,14 @@ GEM
     memoizable (0.4.2)
       thread_safe (~> 0.3, >= 0.3.1)
     method_source (0.8.2)
-    minitest (5.10.2)
-    multi_json (1.12.1)
+    minitest (5.14.2)
+    multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    mustermann-grape (1.0.1)
+      mustermann (>= 1.0.0)
     nenv (0.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -228,8 +244,6 @@ GEM
     rack (1.6.13)
     rack-accept (0.4.5)
       rack (>= 0.4)
-    rack-mount (0.8.3)
-      rack (>= 1.0.0)
     rack-protection (1.5.5)
       rack
     rack-test (0.6.3)
@@ -268,6 +282,7 @@ GEM
       rspec-support (~> 3.6.0)
     rspec-support (3.6.0)
     ruby-prof (0.16.2)
+    ruby2_keywords (0.0.2)
     ruby_dep (1.5.0)
     rufus-scheduler (3.4.2)
       et-orbi (~> 1.0)
@@ -301,7 +316,7 @@ GEM
     timers (4.1.2)
       hitimes
     tins (1.14.0)
-    tzinfo (1.2.3)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
     uber (0.0.15)
     unparser (0.2.5)
@@ -314,11 +329,6 @@ GEM
       procto (~> 0.0.2)
     uri_template (0.7.0)
     vcr (3.0.3)
-    virtus (1.0.5)
-      axiom-types (~> 0.1)
-      coercible (~> 1.0)
-      descendants_tracker (~> 0.0, >= 0.0.3)
-      equalizer (~> 0.0, >= 0.0.9)
     warden (1.2.7)
       rack (>= 1.0)
     yard (0.9.25)
@@ -344,7 +354,7 @@ DEPENDENCIES
   faraday (~> 0.9.0)
   faraday_middleware (~> 0.10.0)
   foreman
-  grape (~> 0.9.0)
+  grape (~> 1.4.0)
   guard-livereload
   guard-rspec
   guard-shotgun (~> 0.4.0)