diff --git a/.travis.yml b/.travis.yml
index 92ba4e650..62088270f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ rvm:
   - jruby-9.1.0.0
   - jruby-head
 before_install:
-  - gem install bundler -v '~> 1.12.5' --no-document
+  - gem install bundler --no-document
 before_script:
   - unset JRUBY_OPTS
 script: ruby -Ilib exe/rake
diff --git a/Rakefile b/Rakefile
index e0d2ced3d..6179be099 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,6 +9,9 @@
 lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
+# XXX: https://github.com/bundler/bundler/pull/4981
+require "bundler/plugin/api/source"
+
 require "bundler/gem_tasks"
 require "rake/testtask"
 require "rdoc/task"