diff --git a/Thorfile b/Thorfile
index a42f9b18e6..5b3d1c4d6a 100644
--- a/Thorfile
+++ b/Thorfile
@@ -3,7 +3,7 @@ class Gemfile < Thor
   def use(version)
     gemfile = "--gemfile gemfiles/rails-#{version}"
     say `bundle install #{gemfile} --binstubs`
-    say `bundle #{gemfile} update rails` unless version =~ /^\d\.\d\.\d$/
+    say `bundle #{gemfile} update rails` unless version =~ /^\d\.\d\.\d/
     say `ln -s gemfiles/bin` unless File.exist?('bin')
     `echo rails-#{version} > ./.gemfile`
   end