diff --git a/Gemfile.lock b/Gemfile.lock
index b798890..2dc1b81 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,20 +7,23 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.0.10)
-      activesupport (= 3.0.10)
-      builder (~> 2.1.2)
-      i18n (~> 0.5.0)
-    activerecord (3.0.10)
-      activemodel (= 3.0.10)
-      activesupport (= 3.0.10)
-      arel (~> 2.0.10)
-      tzinfo (~> 0.3.23)
-    activesupport (3.0.10)
-    arel (2.0.10)
-    builder (2.1.2)
+    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)
     diff-lcs (1.1.2)
-    i18n (0.5.0)
+    i18n (1.11.0)
+      concurrent-ruby (~> 1.0)
+    minitest (5.16.2)
     rspec (2.6.0)
       rspec-core (~> 2.6.0)
       rspec-expectations (~> 2.6.0)
@@ -30,7 +33,9 @@ GEM
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.6.0)
     sqlite3 (1.3.4)
-    tzinfo (0.3.29)
+    thread_safe (0.3.6)
+    tzinfo (1.2.9)
+      thread_safe (~> 0.1)
 
 PLATFORMS
   ruby