diff --git a/mailcatcher.gemspec b/mailcatcher.gemspec
index 787a9553..396ece61 100644
--- a/mailcatcher.gemspec
+++ b/mailcatcher.gemspec
@@ -32,13 +32,13 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = ">= 2.6.0"
 
-  s.add_dependency "eventmachine", "1.0.9.1"
+  s.add_dependency "eventmachine", "1.2.7"
   s.add_dependency "faye-websocket", "~> 0.11.1"
   s.add_dependency "mail", "~> 2.3"
   s.add_dependency "net-smtp"
-  s.add_dependency "rack", "~> 1.5"
-  s.add_dependency "sinatra", "~> 1.2"
-  s.add_dependency "sqlite3", "~> 1.3"
+  s.add_dependency "rack", "~> 2.2"
+  s.add_dependency "sinatra", "~> 2.2"
+  s.add_dependency "sqlite3", "~> 1.6"
   s.add_dependency "thin", "~> 1.8"
 
   s.add_development_dependency "capybara"