diff --git a/Gemfile b/Gemfile
index 3a7fb1a..b6931a9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem 'eventmachine', '~> 1.2.7'
 gem 'simpleidn', '~> 0.2.1' # For punycode
 
 # database
-gem 'activerecord', '~> 7.2', '>= 7.2.2.2'
+gem 'activerecord', '~> 8.1'
 gem 'daemons', '~> 1.4.1'
 gem 'dotenv'
 gem 'pg', '~> 1.6.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7e48b7e..88af3c4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,37 +1,37 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (7.2.2.2)
-      activesupport (= 7.2.2.2)
-    activerecord (7.2.2.2)
-      activemodel (= 7.2.2.2)
-      activesupport (= 7.2.2.2)
+    activemodel (8.1.2)
+      activesupport (= 8.1.2)
+    activerecord (8.1.2)
+      activemodel (= 8.1.2)
+      activesupport (= 8.1.2)
       timeout (>= 0.4.0)
-    activesupport (7.2.2.2)
+    activesupport (8.1.2)
       base64
-      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      json
       logger (>= 1.4.2)
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
     ast (2.4.3)
     base64 (0.3.0)
-    benchmark (0.4.1)
-    bigdecimal (3.3.1)
+    bigdecimal (4.0.1)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
-    connection_pool (2.5.4)
+    concurrent-ruby (1.3.6)
+    connection_pool (3.0.2)
     daemons (1.4.1)
     docile (1.4.1)
     dotenv (3.1.8)
     drb (2.2.3)
     eventmachine (1.2.7)
-    i18n (1.14.7)
+    i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     json (2.15.2)
     language_server-protocol (3.17.0.5)
@@ -81,19 +81,20 @@ GEM
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
     simpleidn (0.2.3)
-    timeout (0.4.3)
+    timeout (0.6.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
     unicode-emoji (4.1.0)
+    uri (1.1.1)
 
 PLATFORMS
   aarch64-linux
   ruby
 
 DEPENDENCIES
-  activerecord (~> 7.2, >= 7.2.2.2)
+  activerecord (~> 8.1)
   daemons (~> 1.4.1)
   dotenv
   eventmachine (~> 1.2.7)