diff --git a/Gemfile b/Gemfile
index 20be1cc..6f6c51a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,6 @@ group :test do
   gem "rake"
   gem "mocha", "~> 0.9.11"
   gem "sqlite3", "~> 1.3.5"
-  gem "activerecord", "~> 3.2.9"
+  gem "activerecord", "~> 5.2.8"
   gem "will_paginate", "~> 3.0.5"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 453876d..a027dcf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,34 +1,35 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.2.11)
-      activesupport (= 3.2.11)
-      builder (~> 3.0.0)
-    activerecord (3.2.11)
-      activemodel (= 3.2.11)
-      activesupport (= 3.2.11)
-      arel (~> 3.0.2)
-      tzinfo (~> 0.3.29)
-    activesupport (3.2.11)
-      i18n (~> 0.6)
-      multi_json (~> 1.0)
-    arel (3.0.2)
-    builder (3.0.4)
+    activemodel (5.2.8.1)
+      activesupport (= 5.2.8.1)
+    activerecord (5.2.8.1)
+      activemodel (= 5.2.8.1)
+      activesupport (= 5.2.8.1)
+      arel (>= 9.0)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    arel (9.0.0)
     concurrent-ruby (1.1.10)
-    i18n (0.9.5)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
+    minitest (5.16.2)
     mocha (0.9.12)
-    multi_json (1.5.0)
     rake (10.0.3)
     sqlite3 (1.3.6)
-    tzinfo (0.3.61)
+    thread_safe (0.3.6)
+    tzinfo (1.2.10)
+      thread_safe (~> 0.1)
     will_paginate (3.0.5)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 3.2.9)
+  activerecord (~> 5.2.8)
   mocha (~> 0.9.11)
   rake
   sqlite3 (~> 1.3.5)