diff --git a/Gemfile b/Gemfile
index e33a5f4..e9e3799 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 ruby '2.3.5'
 
-gem 'rails', '~> 5.1.6'
+gem 'rails', '~> 5.2.7'
 
 # infrastructure
 gem 'puma', '~> 3.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index c42dc8d..11f1bb1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,39 +1,43 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.1.7)
-      actionpack (= 5.1.7)
+    actioncable (5.2.7)
+      actionpack (= 5.2.7)
       nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.7)
+      actionpack (= 5.2.7)
+      actionview (= 5.2.7)
+      activejob (= 5.2.7)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.7)
-      actionview (= 5.1.7)
-      activesupport (= 5.1.7)
-      rack (~> 2.0)
+    actionpack (5.2.7)
+      actionview (= 5.2.7)
+      activesupport (= 5.2.7)
+      rack (~> 2.0, >= 2.0.8)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.7)
-      activesupport (= 5.1.7)
+    actionview (5.2.7)
+      activesupport (= 5.2.7)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.7)
-      activesupport (= 5.1.7)
+    activejob (5.2.7)
+      activesupport (= 5.2.7)
       globalid (>= 0.3.6)
-    activemodel (5.1.7)
-      activesupport (= 5.1.7)
-    activerecord (5.1.7)
-      activemodel (= 5.1.7)
-      activesupport (= 5.1.7)
-      arel (~> 8.0)
-    activesupport (5.1.7)
+    activemodel (5.2.7)
+      activesupport (= 5.2.7)
+    activerecord (5.2.7)
+      activemodel (= 5.2.7)
+      activesupport (= 5.2.7)
+      arel (>= 9.0)
+    activestorage (5.2.7)
+      actionpack (= 5.2.7)
+      activerecord (= 5.2.7)
+      marcel (~> 1.0.0)
+    activesupport (5.2.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -41,15 +45,15 @@ GEM
     annotate (2.7.4)
       activerecord (>= 3.2, < 6.0)
       rake (>= 10.4, < 13.0)
-    arel (8.0.0)
+    arel (9.0.0)
     bindex (0.5.0)
-    builder (3.2.3)
+    builder (3.2.4)
     byebug (11.0.1)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.9)
     connection_pool (2.2.2)
-    crass (1.0.4)
+    crass (1.0.6)
     diff-lcs (1.3)
-    erubi (1.8.0)
+    erubi (1.10.0)
     execjs (2.7.0)
     fakeweb (1.3.0)
     faraday (0.15.2)
@@ -64,9 +68,9 @@ GEM
     ffi (1.9.25)
     foreman (0.85.0)
       thor (~> 0.19.1)
-    globalid (0.4.2)
-      activesupport (>= 4.2.0)
-    i18n (1.6.0)
+    globalid (1.0.0)
+      activesupport (>= 5.0)
+    i18n (1.10.0)
       concurrent-ruby (~> 1.0)
     jquery-rails (4.3.3)
       rails-dom-testing (>= 1, < 3)
@@ -76,37 +80,41 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.2.3)
+    loofah (2.14.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
-    method_source (0.9.2)
-    mini_mime (1.0.1)
-    mini_portile2 (2.4.0)
-    minitest (5.11.3)
+    marcel (1.0.2)
+    method_source (1.0.0)
+    mini_mime (1.1.2)
+    mini_portile2 (2.8.0)
+    minitest (5.15.0)
     multipart-post (2.0.0)
-    nio4r (2.3.1)
-    nokogiri (1.10.2)
-      mini_portile2 (~> 2.4.0)
+    nio4r (2.5.8)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     pg (1.1.4)
     puma (3.12.1)
-    rack (2.0.6)
+    racc (1.6.0)
+    rack (2.2.3)
     rack-protection (2.0.5)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.1.7)
-      actioncable (= 5.1.7)
-      actionmailer (= 5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
-      activemodel (= 5.1.7)
-      activerecord (= 5.1.7)
-      activesupport (= 5.1.7)
+    rails (5.2.7)
+      actioncable (= 5.2.7)
+      actionmailer (= 5.2.7)
+      actionpack (= 5.2.7)
+      actionview (= 5.2.7)
+      activejob (= 5.2.7)
+      activemodel (= 5.2.7)
+      activerecord (= 5.2.7)
+      activestorage (= 5.2.7)
+      activesupport (= 5.2.7)
       bundler (>= 1.3.0)
-      railties (= 5.1.7)
+      railties (= 5.2.7)
       sprockets-rails (>= 2.0.0)
     rails-controller-testing (1.0.4)
       actionpack (>= 5.0.1.x)
@@ -115,19 +123,19 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.4)
-      loofah (~> 2.2, >= 2.2.2)
+    rails-html-sanitizer (1.4.2)
+      loofah (~> 2.3)
     rails_real_favicon (0.0.12)
       json (>= 1.7, < 3)
       rails (>= 3.1)
       rubyzip (~> 1)
-    railties (5.1.7)
-      actionpack (= 5.1.7)
-      activesupport (= 5.1.7)
+    railties (5.2.7)
+      actionpack (= 5.2.7)
+      activesupport (= 5.2.7)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
-    rake (12.3.2)
+      thor (>= 0.19.0, < 2.0)
+    rake (12.3.3)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)
       ffi (>= 0.5.0)
@@ -175,9 +183,9 @@ GEM
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.1)
-      actionpack (>= 4.0)
-      activesupport (>= 4.0)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     sqlite3 (1.4.0)
     state_machines (0.5.0)
@@ -193,7 +201,7 @@ GEM
     turbolinks (5.2.0)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
@@ -202,9 +210,9 @@ GEM
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
-    websocket-driver (0.6.5)
+    websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.5)
 
 PLATFORMS
   ruby
@@ -220,7 +228,7 @@ DEPENDENCIES
   nokogiri (~> 1)
   pg
   puma (~> 3.0)
-  rails (~> 5.1.6)
+  rails (~> 5.2.7)
   rails-controller-testing
   rails_real_favicon
   rspec-rails