diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index df95f170..0a9c3576 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -301,7 +301,7 @@ class Kamal::Configuration
     end
 
     def ensure_valid_service_name
-      raise ArgumentError, "Service name can only include alphanumeric characters, hyphens, and underscores" unless raw_config[:service] =~ /^[a-z0-9_-]+$/
+      raise ArgumentError, "Service name can only include alphanumeric characters, hyphens, and underscores" unless raw_config[:service] =~ /^[a-z0-9_-]+$/i
 
       true
     end
diff --git a/test/configuration_test.rb b/test/configuration_test.rb
index 6f89d669..36a9f305 100644
--- a/test/configuration_test.rb
+++ b/test/configuration_test.rb
@@ -44,6 +44,7 @@ class ConfigurationTest < ActiveSupport::TestCase
 
   test "service name valid" do
     assert Kamal::Configuration.new(@deploy.tap { _1[:service] = "hey-app1_primary" }).valid?
+    assert Kamal::Configuration.new(@deploy.tap { _1[:service] = "MyApp" }).valid?
   end
 
   test "service name invalid" do