diff --git a/lib/producer/core/cli.rb b/lib/producer/core/cli.rb
index b7c5653..b097de9 100644
--- a/lib/producer/core/cli.rb
+++ b/lib/producer/core/cli.rb
@@ -3,7 +3,7 @@ module Producer
     class CLI
       ArgumentError = Class.new(::ArgumentError)
 
-      USAGE = "Usage: #{File.basename $0} [-v] [-n] recipe_file"
+      USAGE = "Usage: #{File.basename $0} [-v] [-n] recipe_file".freeze
 
       EX_USAGE = 64
 
diff --git a/lib/producer/core/version.rb b/lib/producer/core/version.rb
index ca74d02..9ed4268 100644
--- a/lib/producer/core/version.rb
+++ b/lib/producer/core/version.rb
@@ -1,5 +1,5 @@
 module Producer
   module Core
-    VERSION = '0.2.5'
+    VERSION = '0.2.5'.freeze
   end
 end