diff --git a/lib/simple_crowd/mock_client.rb b/lib/simple_crowd/mock_client.rb
index bceae81..ad2ece6 100644
--- a/lib/simple_crowd/mock_client.rb
+++ b/lib/simple_crowd/mock_client.rb
@@ -67,6 +67,7 @@ def search_users criteria, limit=0, start=0
     def add_user user, credential
       if user && user.username && !find_user_by_name(user.username)
         user.instance_variable_set('@password', credential)
+        user.instance_variable_set('@email', user.username)
         self.class.users << user
         user
       end
diff --git a/simple_crowd.gemspec b/simple_crowd.gemspec
index 2537b5d..b7be262 100644
--- a/simple_crowd.gemspec
+++ b/simple_crowd.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
-  s.add_runtime_dependency(%q<savon>, [">= 1.0.0"])
+  s.add_runtime_dependency(%q<savon>, ["~> 1.0.0"])
 
   s.add_development_dependency(%q<bundler>, [">= 1.0.21"])
   s.add_development_dependency(%q<rake>, [">= 0"])