diff --git a/examples/sinatra/Gemfile b/examples/sinatra/Gemfile
index c7da64ab..4d365e06 100644
--- a/examples/sinatra/Gemfile
+++ b/examples/sinatra/Gemfile
@@ -6,5 +6,5 @@ gem 'exception_notification', path: '../../'
 
 gem 'foreman'
 gem 'mailcatcher'
-gem 'sinatra', '~> 1.3.5'
-gem 'thin', '~> 1.5.1'
+gem 'sinatra'
+gem 'thin'
diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index a2a574aa..2eb80d97 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -1,95 +1,169 @@
 PATH
-  remote: ../../
+  remote: ../..
   specs:
-    exception_notification (3.0.1)
-      actionmailer (>= 3.0.4)
-      activesupport (>= 3.0.4)
+    exception_notification (4.5.0)
+      actionmailer (>= 5.2, < 8)
+      activesupport (>= 5.2, < 8)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (3.2.13)
-      actionpack (= 3.2.13)
-      mail (~> 2.5.3)
-    actionpack (3.2.13)
-      activemodel (= 3.2.13)
-      activesupport (= 3.2.13)
-      builder (~> 3.0.0)
-      erubis (~> 2.7.0)
-      journey (~> 1.0.4)
-      rack (~> 1.4.5)
-      rack-cache (~> 1.2)
-      rack-test (~> 0.6.1)
-      sprockets (~> 2.2.1)
-    activemodel (3.2.13)
-      activesupport (= 3.2.13)
-      builder (~> 3.0.0)
-    activesupport (3.2.13)
-      i18n (= 0.6.1)
-      multi_json (~> 1.0)
-    builder (3.0.4)
-    daemons (1.1.9)
-    erubis (2.7.0)
-    eventmachine (1.0.3)
-    foreman (0.61.0)
-      thor (>= 0.13.6)
-    haml (4.0.2)
-      tilt
-    hike (1.2.1)
-    i18n (0.6.1)
-    journey (1.0.4)
-    mail (2.5.3)
-      i18n (>= 0.4.0)
-      mime-types (~> 1.16)
-      treetop (~> 1.4.8)
-    mailcatcher (0.5.11)
-      activesupport (~> 3.0)
-      eventmachine (~> 1.0.0)
-      haml (>= 3.1, < 5)
+    actionmailer (7.2.0)
+      actionpack (= 7.2.0)
+      actionview (= 7.2.0)
+      activejob (= 7.2.0)
+      activesupport (= 7.2.0)
+      mail (>= 2.8.0)
+      rails-dom-testing (~> 2.2)
+    actionpack (7.2.0)
+      actionview (= 7.2.0)
+      activesupport (= 7.2.0)
+      nokogiri (>= 1.8.5)
+      racc
+      rack (>= 2.2.4, < 3.2)
+      rack-session (>= 1.0.1)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+      useragent (~> 0.16)
+    actionview (7.2.0)
+      activesupport (= 7.2.0)
+      builder (~> 3.1)
+      erubi (~> 1.11)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    activejob (7.2.0)
+      activesupport (= 7.2.0)
+      globalid (>= 0.3.6)
+    activesupport (7.2.0)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+    base64 (0.2.0)
+    bigdecimal (3.1.8)
+    builder (3.3.0)
+    concurrent-ruby (1.3.4)
+    connection_pool (2.4.1)
+    crass (1.0.6)
+    daemons (1.4.1)
+    date (3.3.4)
+    drb (2.2.1)
+    erubi (1.13.0)
+    eventmachine (1.2.7)
+    faye-websocket (0.11.3)
+      eventmachine (>= 0.12.0)
+      websocket-driver (>= 0.5.1)
+    foreman (0.88.1)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    i18n (1.14.5)
+      concurrent-ruby (~> 1.0)
+    logger (1.6.0)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    mailcatcher (0.10.0)
+      eventmachine (~> 1.0)
+      faye-websocket (~> 0.11.1)
       mail (~> 2.3)
-      sinatra (~> 1.2)
-      skinny (~> 0.2.3)
+      net-smtp
+      rack (~> 2.2)
+      sinatra (~> 3.2)
       sqlite3 (~> 1.3)
-      thin (~> 1.5.0)
-    mime-types (1.22)
-    multi_json (1.7.2)
-    polyglot (0.3.3)
-    rack (1.4.5)
-    rack-cache (1.2)
-      rack (>= 0.4)
-    rack-protection (1.5.0)
-      rack
-    rack-test (0.6.2)
-      rack (>= 1.0)
-    sinatra (1.3.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.3)
-      tilt (~> 1.3, >= 1.3.3)
-    skinny (0.2.3)
-      eventmachine (~> 1.0.0)
-      thin (~> 1.5.0)
-    sprockets (2.2.2)
-      hike (~> 1.2)
-      multi_json (~> 1.0)
-      rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
-    sqlite3 (1.3.7)
-    thin (1.5.1)
-      daemons (>= 1.0.9)
-      eventmachine (>= 0.12.6)
-      rack (>= 1.0.0)
-    thor (0.18.1)
-    tilt (1.3.6)
-    treetop (1.4.12)
-      polyglot
-      polyglot (>= 0.3.1)
+      thin (~> 1.8)
+    mini_mime (1.1.5)
+    minitest (5.25.0)
+    mustermann (3.0.2)
+      ruby2_keywords (~> 0.0.1)
+    net-imap (0.4.14)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.5.0)
+      net-protocol
+    nokogiri (1.16.7-aarch64-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-arm-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86_64-linux)
+      racc (~> 1.4)
+    racc (1.8.1)
+    rack (2.2.9)
+    rack-protection (3.2.0)
+      base64 (>= 0.1.0)
+      rack (~> 2.2, >= 2.2.4)
+    rack-session (1.0.2)
+      rack (< 3)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    ruby2_keywords (0.0.5)
+    securerandom (0.3.1)
+    sinatra (3.2.0)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.2.0)
+      tilt (~> 2.0)
+    sqlite3 (1.7.3-aarch64-linux)
+    sqlite3 (1.7.3-arm-linux)
+    sqlite3 (1.7.3-arm64-darwin)
+    sqlite3 (1.7.3-x86-linux)
+    sqlite3 (1.7.3-x86_64-darwin)
+    sqlite3 (1.7.3-x86_64-linux)
+    thin (1.8.2)
+      daemons (~> 1.0, >= 1.0.9)
+      eventmachine (~> 1.0, >= 1.0.4)
+      rack (>= 1, < 3)
+    tilt (2.4.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    useragent (0.16.10)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
 
 PLATFORMS
-  ruby
+  aarch64-linux
+  arm-linux
+  arm64-darwin
+  x86-linux
+  x86_64-darwin
+  x86_64-linux
 
 DEPENDENCIES
   exception_notification!
   foreman
   mailcatcher
-  sinatra (~> 1.3.5)
-  thin (~> 1.5.1)
+  sinatra
+  thin
+
+BUNDLED WITH
+   2.5.17
diff --git a/exception_notification.gemspec b/exception_notification.gemspec
index 52c439a3..263e432f 100644
--- a/exception_notification.gemspec
+++ b/exception_notification.gemspec
@@ -20,8 +20,8 @@ Gem::Specification.new do |s|
   s.test_files = `git ls-files -- test`.split("\n")
   s.require_path = 'lib'
 
-  s.add_dependency('actionmailer', '>= 5.2', '< 8')
-  s.add_dependency('activesupport', '>= 5.2', '< 8')
+  s.add_dependency('actionmailer', '>= 5.2', '< 9')
+  s.add_dependency('activesupport', '>= 5.2', '< 9')
 
   s.add_development_dependency 'appraisal', '~> 2.2.0'
   s.add_development_dependency 'aws-sdk-sns', '~> 1'
@@ -33,7 +33,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'mocha', '>= 0.13.0'
   s.add_development_dependency 'mock_redis', '~> 0.19.0'
   s.add_development_dependency 'net-smtp'
-  s.add_development_dependency 'rails', '>= 5.2', '< 8'
+  s.add_development_dependency 'rails', '>= 5.2', '< 9'
   s.add_development_dependency 'resque', '~> 1.8.0'
   s.add_development_dependency 'rubocop', '0.78.0'
   s.add_development_dependency 'sidekiq', '>= 5.0.4'