diff --git a/Gemfile.lock b/Gemfile.lock
index 23a02e42..9a3f4656 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,21 +52,22 @@ GEM
     ast (2.4.0)
     bcrypt (3.1.12)
     builder (3.2.3)
-    bullet (5.7.6)
+    bullet (5.8.1)
       activesupport (>= 3.0.0)
-      uniform_notifier (~> 1.11.0)
+      uniform_notifier (~> 1.11)
     byebug (10.0.2)
-    capybara (3.9.0)
+    capybara (3.10.1)
       addressable
       mini_mime (>= 0.1.3)
       nokogiri (~> 1.8)
       rack (>= 1.6.0)
       rack-test (>= 0.6.3)
-      xpath (~> 3.1)
+      regexp_parser (~> 1.2)
+      xpath (~> 3.2)
     chunky_png (1.3.10)
     commonmarker (0.18.1)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.1)
     crass (1.0.4)
     diff-lcs (1.3)
     dynamic_form (1.1.4)
@@ -102,14 +103,14 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.2.2)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
-    method_source (0.9.0)
+    method_source (0.9.1)
     mimemagic (0.3.2)
     mini_mime (1.0.1)
     mini_portile2 (2.3.0)
@@ -120,11 +121,11 @@ GEM
       mini_portile2 (~> 2.3.0)
     oauth (0.5.4)
     parallel (1.12.1)
-    parser (2.5.1.2)
+    parser (2.5.3.0)
       ast (~> 2.4.0)
     powerpack (0.1.2)
     public_suffix (3.0.3)
-    rack (2.0.5)
+    rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.1)
@@ -158,7 +159,9 @@ GEM
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     rb-readline (0.5.5)
-    rotp (3.3.1)
+    regexp_parser (1.2.0)
+    rotp (4.0.2)
+      addressable (~> 2.5)
     rqrcode (0.10.1)
       chunky_png (~> 1.0)
     rspec-core (3.8.0)
@@ -169,7 +172,7 @@ GEM
     rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
-    rspec-rails (3.8.0)
+    rspec-rails (3.8.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
@@ -178,16 +181,16 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    rubocop (0.59.2)
+    rubocop (0.60.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    rubocop-rspec (1.30.0)
-      rubocop (>= 0.58.0)
+      unicode-display_width (~> 1.4.0)
+    rubocop-rspec (1.30.1)
+      rubocop (>= 0.60.0)
     ruby-enum (0.7.2)
       i18n
     ruby-progressbar (1.10.0)
@@ -218,7 +221,7 @@ GEM
     unicorn (5.4.1)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    uniform_notifier (1.11.0)
+    uniform_notifier (1.12.1)
     websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 1e015dfd..733cf0fc 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -41,7 +41,7 @@ class Comment < ApplicationRecord
   # after this many minutes old, a comment cannot be edited
   MAX_EDIT_MINS = (60 * 6)
 
-  SCORE_RANGE_TO_HIDE = (-2 .. 4)
+  SCORE_RANGE_TO_HIDE = (-2 .. 4).freeze
 
   validate do
     self.comment.to_s.strip == "" &&
diff --git a/app/models/story.rb b/app/models/story.rb
index 4bccc1ab..15359bb4 100644
--- a/app/models/story.rb
+++ b/app/models/story.rb
@@ -126,10 +126,10 @@ class Story < ApplicationRecord
     wp.me ➡.ws ✩.ws x.co yep.it yourls.org zip.net }.freeze
 
   # URI.parse is not very lenient, so we can't use it
-  URL_RE = /\A(?<protocol>https?):\/\/(?<domain>([^\.\/]+\.)+[a-z]+)(?<port>:\d+)?(\/|\z)/i
+  URL_RE = /\A(?<protocol>https?):\/\/(?<domain>([^\.\/]+\.)+[a-z]+)(?<port>:\d+)?(\/|\z)/i.freeze
 
   # Dingbats, emoji, and other graphics https://www.unicode.org/charts/
-  GRAPHICS_RE = /[\u{0000}-\u{001F}\u{2190}-\u{27BF}\u{1F000}-\u{1F9FF}]/
+  GRAPHICS_RE = /[\u{0000}-\u{001F}\u{2190}-\u{27BF}\u{1F000}-\u{1F9FF}]/.freeze
 
   attr_accessor :already_posted_story, :editing_from_suggestions, :editor,
                 :fetching_ip, :is_hidden_by_cur_user, :is_saved_by_cur_user,
diff --git a/app/models/user.rb b/app/models/user.rb
index de1c63c2..2f6a16b0 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -75,7 +75,7 @@ class User < ApplicationRecord
 
   validates :password, :presence => true, :on => :create
 
-  VALID_USERNAME = /[A-Za-z0-9][A-Za-z0-9_-]{0,24}/
+  VALID_USERNAME = /[A-Za-z0-9][A-Za-z0-9_-]{0,24}/.freeze
   validates :username,
             :format => { :with => /\A#{VALID_USERNAME}\z/ },
             :uniqueness => { :case_sensitive => false }