diff --git a/Gemfile.lock b/Gemfile.lock
index b85c77fa..f6328178 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ PATH
       bcrypt_pbkdf (~> 1.0)
       concurrent-ruby (~> 1.2)
       dotenv (~> 3.1)
-      ed25519 (~> 1.2)
+      ed25519 (~> 1.4)
       net-ssh (~> 7.3)
       sshkit (>= 1.23.0, < 2.0)
       thor (~> 1.3)
@@ -60,7 +60,7 @@ GEM
       reline (>= 0.3.8)
     dotenv (3.1.5)
     drb (2.2.1)
-    ed25519 (1.3.0)
+    ed25519 (1.4.0)
     erubi (1.13.0)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
diff --git a/kamal.gemspec b/kamal.gemspec
index 7218f865..2d66d09a 100644
--- a/kamal.gemspec
+++ b/kamal.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "thor", "~> 1.3"
   spec.add_dependency "dotenv", "~> 3.1"
   spec.add_dependency "zeitwerk", ">= 2.6.18", "< 3.0"
-  spec.add_dependency "ed25519", "~> 1.2"
+  spec.add_dependency "ed25519", "~> 1.4"
   spec.add_dependency "bcrypt_pbkdf", "~> 1.0"
   spec.add_dependency "concurrent-ruby", "~> 1.2"
   spec.add_dependency "base64", "~> 0.2"
diff --git a/lib/kamal/configuration/proxy/boot.rb b/lib/kamal/configuration/proxy/boot.rb
index 9f8c6f5c..7cdd6a06 100644
--- a/lib/kamal/configuration/proxy/boot.rb
+++ b/lib/kamal/configuration/proxy/boot.rb
@@ -1,5 +1,5 @@
 class Kamal::Configuration::Proxy::Boot
-  MINIMUM_VERSION = "v0.8.7"
+  MINIMUM_VERSION = "v0.9.0"
   DEFAULT_HTTP_PORT = 80
   DEFAULT_HTTPS_PORT = 443
   DEFAULT_LOG_MAX_SIZE = "10m"
diff --git a/test/integration/docker/deployer/setup.sh b/test/integration/docker/deployer/setup.sh
index 24f39d7f..1ad7998b 100755
--- a/test/integration/docker/deployer/setup.sh
+++ b/test/integration/docker/deployer/setup.sh
@@ -20,7 +20,7 @@ push_image_to_registry_4443() {
 install_kamal
 push_image_to_registry_4443 nginx 1-alpine-slim
 push_image_to_registry_4443 busybox 1.36.0
-push_image_to_registry_4443 basecamp/kamal-proxy v0.8.7
+push_image_to_registry_4443 basecamp/kamal-proxy v0.9.0
 
 # .ssh is on a shared volume that persists between runs. Clean it up as the
 # churn of temporary vm IPs can eventually create conflicts.