diff --git a/Gemfile b/Gemfile
index b85bb970..a9b3c78d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,9 @@ gem "salama-object-file" , :github => "salama/salama-object-file"
 
 gem "codeclimate-test-reporter", require: nil
 
+
 group :development do
+  gem "thor" , "0.19.1"
   gem "minitest"
   gem 'guard' # NOTE: this is necessary in newer versions
   gem 'guard-minitest'
diff --git a/Gemfile.lock b/Gemfile.lock
index f9678e93..f765bbd2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
     sysinfo (0.8.1)
       drydock
       storable
-    thor (0.19.4)
+    thor (0.19.1)
 
 PLATFORMS
   ruby
@@ -107,6 +107,7 @@ DEPENDENCIES
   rye
   salama!
   salama-object-file!
+  thor (= 0.19.1)
 
 BUNDLED WITH
    1.13.5