diff --git a/kamal.gemspec b/kamal.gemspec
index 0dfab60b..2695d4b6 100644
--- a/kamal.gemspec
+++ b/kamal.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "net-ssh", "~> 7.0"
   spec.add_dependency "thor", "~> 1.3"
   spec.add_dependency "dotenv", "~> 3.1"
-  spec.add_dependency "zeitwerk", "~> 2.5"
+  spec.add_dependency "zeitwerk", ">= 2.6.18", "< 2.0"
   spec.add_dependency "ed25519", "~> 1.2"
   spec.add_dependency "bcrypt_pbkdf", "~> 1.0"
   spec.add_dependency "concurrent-ruby", "~> 1.2"