diff --git a/Gemfile.lock b/Gemfile.lock
index bf01de5..05a17c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,13 +2,14 @@ PATH
   remote: .
   specs:
     ruby-pardot (1.4.1)
-      crack (= 0.4.4)
+      crack (= 0.4.5)
       httparty (= 0.18.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    crack (0.4.4)
+    crack (0.4.5)
+      rexml
     diff-lcs (1.4.4)
     fakeweb (1.3.0)
     httparty (0.18.1)
@@ -18,6 +19,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.1104)
     multi_xml (0.6.0)
+    rexml (3.2.5)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
diff --git a/ruby-pardot.gemspec b/ruby-pardot.gemspec
index 26d9d80..62cdbb8 100644
--- a/ruby-pardot.gemspec
+++ b/ruby-pardot.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = ">= 1.3.6"
   s.rubyforge_project         = "ruby-pardot"
 
-  s.add_dependency 'crack', '0.4.4'
+  s.add_dependency 'crack', '0.4.5'
   s.add_dependency 'httparty', '0.18.1'
 
   s.add_development_dependency "bundler", ">= 1.10"