diff --git a/Gemfile.lock b/Gemfile.lock
index 52249fb..262de86 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,29 +1,31 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.2.1)
-      activesupport (= 3.2.1)
-      builder (~> 3.0.0)
-    activerecord (3.2.1)
-      activemodel (= 3.2.1)
-      activesupport (= 3.2.1)
-      arel (~> 3.0.0)
-      tzinfo (~> 0.3.29)
-    activesupport (3.2.1)
-      i18n (~> 0.6)
-      multi_json (~> 1.0)
-    arel (3.0.2)
-    builder (3.0.0)
+    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 (1.1.3)
     git (1.2.5)
-    i18n (0.6.0)
+    i18n (1.11.0)
+      concurrent-ruby (~> 1.0)
     jeweler (1.8.3)
       bundler (~> 1.0)
       git (>= 1.2.5)
       rake
       rdoc
     json (1.6.5)
-    multi_json (1.1.0)
+    minitest (5.16.2)
+    multi_json (1.15.0)
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)
@@ -40,7 +42,9 @@ GEM
       simplecov-html (~> 0.5.3)
     simplecov-html (0.5.3)
     sqlite3 (1.3.5)
-    tzinfo (0.3.31)
+    thread_safe (0.3.6)
+    tzinfo (1.2.9)
+      thread_safe (~> 0.1)
 
 PLATFORMS
   ruby