diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index 92d850e2..52c807d7 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -37,7 +37,7 @@ class Kamal::Configuration
         if file.exist?
           # Newer Psych doesn't load aliases by default
           load_method = YAML.respond_to?(:unsafe_load) ? :unsafe_load : :load
-          YAML.send(load_method, ERB.new(IO.read(file)).result).symbolize_keys
+          YAML.send(load_method, ERB.new(File.read(file)).result).symbolize_keys
         else
           raise "Configuration file not found in #{file}"
         end
diff --git a/lib/kamal/configuration/accessory.rb b/lib/kamal/configuration/accessory.rb
index 2728607d..198e6321 100644
--- a/lib/kamal/configuration/accessory.rb
+++ b/lib/kamal/configuration/accessory.rb
@@ -142,7 +142,7 @@ class Kamal::Configuration::Accessory
     end
 
     def read_dynamic_file(local_file)
-      StringIO.new(ERB.new(IO.read(local_file)).result)
+      StringIO.new(ERB.new(File.read(local_file)).result)
     end
 
     def expand_remote_file(remote_file)