diff --git a/Gemfile b/Gemfile
index b0fa7fc..5f63477 100644
--- a/Gemfile
+++ b/Gemfile
@@ -34,7 +34,7 @@ gem 'binding_of_caller'
 
 # db
 gem 'pg'
-gem 'activerecord', '~> 5.2.3'
+gem 'activerecord', '~> 5.2.4'
 gem 'sinatra-activerecord'
 
 # http
diff --git a/Gemfile.lock b/Gemfile.lock
index a69c1f3..2453610 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,13 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
+    activemodel (5.2.4.5)
+      activesupport (= 5.2.4.5)
+    activerecord (5.2.4.5)
+      activemodel (= 5.2.4.5)
+      activesupport (= 5.2.4.5)
       arel (>= 9.0)
-    activesupport (5.2.3)
+    activesupport (5.2.4.5)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -39,7 +39,7 @@ GEM
       capistrano (~> 3.1)
       capistrano-bundler (~> 1.1)
     coderay (1.1.2)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.8)
     connection_pool (2.2.2)
     crass (1.0.4)
     debug_inspector (0.0.3)
@@ -63,7 +63,7 @@ GEM
     httparty (0.17.0)
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
-    i18n (1.6.0)
+    i18n (1.8.9)
       concurrent-ruby (~> 1.0)
     loofah (2.2.3)
       crass (~> 1.0.2)
@@ -82,7 +82,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0904)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
+    minitest (5.14.4)
     multi_json (1.13.1)
     multi_xml (0.6.0)
     mustermann (1.0.3)
@@ -168,7 +168,7 @@ GEM
       net-ssh (>= 2.8.0)
     thread_safe (0.3.6)
     tilt (2.0.9)
-    tzinfo (1.2.5)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     unf (0.1.4)
       unf_ext
@@ -180,7 +180,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 5.2.3)
+  activerecord (~> 5.2.4)
   bcrypt
   better_errors
   binding_of_caller