diff --git a/ruby/Gemfile b/ruby/Gemfile
index 65ed30df2d27fa195e25df89a7f261a8ee3bd338..0ba3f2cf6fa6040d4a3f9b8b7feb235de9920dfd 100644
--- a/ruby/Gemfile
+++ b/ruby/Gemfile
@@ -2,4 +2,3 @@
 source "https://rubygems.org"
 
 gem 'mmap', git: 'https://github.com/lyda/mmap.git', :branch => 'non-global-version'
-#gem 'mmap', :path => '/Users/kevin/src/p4g/mmap'
diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index ca9fdc1bf97b01d654ea943abf7b240542dbb75d..5f39f92eb64d56144874101da5acac847a0343da 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/lyda/mmap.git
-  revision: 397013dd15a4e5f3f2cd9ddbad39850ec9f61d33
+  revision: 5d7015bae9b841ae798982c175ffa9f018887405
   branch: non-global-version
   specs:
-    mmap (0.2.7a)
+    mmap (0.2.7b)
 
 GEM
   remote: https://rubygems.org/
diff --git a/ruby/run.sh b/ruby/run.sh
index 2945b45fdaa9d8e58fd0f67fbd547ed2e982c5bf..f9b8e9dd4b8efa8a68a5654c8589717c585f2c73 100755
--- a/ruby/run.sh
+++ b/ruby/run.sh
@@ -1,5 +1,5 @@
 #! /bin/sh
 
 test -f Gemfile.lock && rm Gemfile.lock
-bundle install
+DEBUG_RESOLVER=1 bundle install
 bundle exec ruby test.rb