diff --git a/Gemfile b/Gemfile
index c792210..c71be35 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rake', '>= 10.4'
 gem 'rbvmomi', '>= 1.8'
 gem 'redis', '>= 3.2'
 gem 'sinatra', '>= 1.4'
-gem 'net-ldap', '= 0.11'
+gem 'net-ldap', '<= 0.12.1' # keep compatibility w/ jruby & mri-1.9.3
 
 # Test deps
 group :test do