diff --git a/Gemfile b/Gemfile
index b629c27..8ec581c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # gem "rails"
 
-gem "activerecord", "~> 5.2"
+gem "activerecord", "~> 6.1"
 gem "sqlite3", "~> 1.4"
 gem "sinatra", "~> 2.0"
 gem "sinatra-activerecord", "~> 2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index df3218a..9c32dfc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,33 +1,32 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activesupport (5.2.3)
+    activemodel (6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activerecord (6.1.7.1)
+      activemodel (= 6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activesupport (6.1.7.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    arel (9.0.0)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     coderay (1.1.2)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.10)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     equatable (0.6.1)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
-    i18n (1.6.0)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     json (2.2.0)
     method_source (0.9.2)
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
-    minitest (5.11.3)
+    minitest (5.17.0)
     mustermann (1.0.3)
     necromancer (0.5.0)
     netrc (0.11.0)
@@ -55,7 +54,6 @@ GEM
       activerecord (>= 3.2)
       sinatra (>= 1.0)
     sqlite3 (1.4.1)
-    thread_safe (0.3.6)
     tilt (2.0.9)
     tty-color (0.5.0)
     tty-cursor (0.7.0)
@@ -68,18 +66,19 @@ GEM
       tty-screen (~> 0.7)
       wisper (~> 2.0.0)
     tty-screen (0.7.0)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
     wisper (2.0.0)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 5.2)
+  activerecord (~> 6.1)
   json
   paint
   pry