diff --git a/Makefile b/Makefile
index 30e173d7..202ee13f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 .PHONY: install test
 
 install:
-	gem install bundler:1.14.6; bundle install
+	gem install bundler:2.1.2; bundle install
 
 test:
 	bundle exec rake spec