diff --git a/lib/sidetiq/lock/meta_data.rb b/lib/sidetiq/lock/meta_data.rb
index a22042f..aa72d37 100644
--- a/lib/sidetiq/lock/meta_data.rb
+++ b/lib/sidetiq/lock/meta_data.rb
@@ -13,12 +13,12 @@ module Sidetiq
         end
 
         def from_json(json = "")
-          # Avoid TypeError when nil is passed to JSON.parse.
+          # Avoid TypeError when nil is passed to Sidekiq.load_json.
           json = "" if json.nil?
 
-          hash = JSON.parse(json, symbolize_names: true)
+          hash = Sidekiq.load_json(json).symbolize_keys
           new(hash)
-        rescue JSON::ParserError => e
+        rescue StandardError => e
           if json != ""
             # Looks like garbage lock metadata, so report it.
             handle_exception(e, context: "Garbage lock meta data detected: #{json}")
diff --git a/lib/sidetiq/middleware/history.rb b/lib/sidetiq/middleware/history.rb
index 4e3bcaa..0119a09 100644
--- a/lib/sidetiq/middleware/history.rb
+++ b/lib/sidetiq/middleware/history.rb
@@ -41,7 +41,7 @@ module Sidetiq
         Sidekiq.redis do |redis|
           list_name = "sidetiq:#{worker.class.name}:history"
 
-          redis.lpush(list_name, JSON.dump(entry))
+          redis.lpush(list_name, Sidekiq.dump_json(entry))
           redis.ltrim(list_name, 0, Sidetiq.config.worker_history - 1)
         end
       end
diff --git a/lib/sidetiq/views/history.erb b/lib/sidetiq/views/history.erb
index 03e331e..551664c 100644
--- a/lib/sidetiq/views/history.erb
+++ b/lib/sidetiq/views/history.erb
@@ -19,7 +19,7 @@
         </thead>
 
         <% @history.each do |entry| %>
-        <% entry = JSON.parse(entry, symbolize_names: true) %>
+        <% entry = Sidekiq.load_json(entry).symbolize_keys %>
         <tr class="<%= 'error' if entry[:status] == 'failure' %>">
           <td><%= entry[:status].capitalize %></td>
           <td><%= Time.parse(entry[:timestamp]).strftime("%m/%d/%Y %I:%M:%S%p") %></td>
diff --git a/sidetiq.gemspec b/sidetiq.gemspec
index df8d497..cdfaac2 100644
--- a/sidetiq.gemspec
+++ b/sidetiq.gemspec
@@ -22,7 +22,6 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'sidekiq',   '~> 2.14.0'
   gem.add_dependency 'celluloid', '>= 0.14.1'
   gem.add_dependency 'ice_cube',  '~> 0.11.0'
-  gem.add_dependency 'json'
 
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'sinatra'
diff --git a/test/test_history.rb b/test/test_history.rb
index 43bcaef..e17b8e7 100644
--- a/test/test_history.rb
+++ b/test/test_history.rb
@@ -13,7 +13,7 @@ class TestHistory < Sidetiq::TestCase
       redis.lrange('sidetiq:TestHistory::HistoryWorker:history', 0, -1)
     end
 
-    actual = JSON.parse(entry[0], symbolize_names: true)
+    actual = Sidekiq.load_json(entry[0]).symbolize_keys
 
     assert_equal 'success', actual[:status]
 
@@ -37,7 +37,7 @@ class TestHistory < Sidetiq::TestCase
       redis.lrange('sidetiq:TestHistory::HistoryWorker:history', 0, -1)
     end
 
-    actual = JSON.parse(entry[0], symbolize_names: true)
+    actual = Sidekiq.load_json(entry[0]).symbolize_keys
 
     assert_equal 'failure', actual[:status]
 
diff --git a/test/test_lock_meta_data.rb b/test/test_lock_meta_data.rb
index 478a513..7ca7ea7 100644
--- a/test/test_lock_meta_data.rb
+++ b/test/test_lock_meta_data.rb
@@ -78,7 +78,7 @@ class TestLockMetaData < Sidetiq::TestCase
     hash = { timestamp: 42, owner: "me", key: "foobar" }
     md = Sidetiq::Lock::MetaData.new(hash)
 
-    assert_equal hash, JSON.parse(md.to_json, symbolize_names: true)
+    assert_equal hash, Sidekiq.load_json(md.to_json).symbolize_keys
   end
 
   def test_to_s