diff --git a/lib/interscript/ml.rb b/lib/interscript/ml.rb
index a6697509..5c9d9b6a 100644
--- a/lib/interscript/ml.rb
+++ b/lib/interscript/ml.rb
@@ -8,6 +8,7 @@
 #   Interscript::ML::Translator.new(model_file: "khm-latn-1.0")
 #     .translate("ភាសា")
 module Interscript::ML
+  require "zip"
   autoload :IMF, "interscript/ml/imf"
   autoload :Provisioning, "interscript/ml/provisioning"
   autoload :Translator, "interscript/ml/translator"
diff --git a/lib/interscript/ml/imf.rb b/lib/interscript/ml/imf.rb
index b0a4ec2c..3d56369d 100644
--- a/lib/interscript/ml/imf.rb
+++ b/lib/interscript/ml/imf.rb
@@ -14,7 +14,7 @@ module IMF
     EOS_ID = 1
     UNK_ID = 2
 
-    DEFAULT_INDEX_URL = "https://github.com/interscript/interscript-models/releases/download/index-v10/models-index.yaml"
+    DEFAULT_INDEX_URL = "https://github.com/interscript/interscript-models/releases/download/index-v12/models-index.yaml"
 
     class FormatError < StandardError; end
     class RegistryError < StandardError; end