diff --git a/Gemfile.lock b/Gemfile.lock
index 4369a5b..56587f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,33 +7,28 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (4.0.12)
-      activesupport (= 4.0.12)
-      builder (~> 3.1.0)
-    activerecord (4.0.12)
-      activemodel (= 4.0.12)
-      activerecord-deprecated_finders (~> 1.0.2)
-      activesupport (= 4.0.12)
-      arel (~> 4.0.0)
-    activerecord-deprecated_finders (1.0.4)
-    activesupport (4.0.12)
-      i18n (~> 0.6, >= 0.6.9)
-      minitest (~> 4.2)
-      multi_json (~> 1.3)
-      thread_safe (~> 0.1)
-      tzinfo (~> 0.3.37)
+    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)
     appraisal (2.2.0)
       bundler
       rake
       thor (>= 0.14.0)
-    arel (4.0.2)
-    builder (3.1.4)
+    arel (9.0.0)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.1.2)
     i18n (0.7.0)
     iconv (1.0.4)
     json (1.8.6)
-    minitest (4.7.5)
-    multi_json (1.10.1)
+    minitest (5.15.0)
     pg (0.17.1)
     rake (0.9.2.2)
     rdoc (3.12)
@@ -46,10 +41,10 @@ GEM
     rspec-expectations (2.5.0)
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.5.0)
-    sqlite3 (1.3.11)
     thor (0.20.3)
-    thread_safe (0.3.4)
-    tzinfo (0.3.42)
+    thread_safe (0.3.6)
+    tzinfo (1.2.10)
+      thread_safe (~> 0.1)
 
 PLATFORMS
   ruby
@@ -64,7 +59,6 @@ DEPENDENCIES
   rake (< 11)
   rdoc (~> 3.12)
   rspec (~> 2.0)
-  sqlite3 (~> 1.3.4)
   validates_lengths_from_database!
 
 BUNDLED WITH