diff --git a/Gemfile.lock b/Gemfile.lock
index 7891c83..40b1455 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,23 +2,24 @@ PATH
   remote: .
   specs:
     ruby-pardot (1.4.1)
-      crack (= 0.4.3)
+      crack (= 0.4.4)
       httparty (= 0.18.1)
+      rexml (= 3.2.5)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    crack (0.4.3)
-      safe_yaml (~> 1.0.0)
-    diff-lcs (1.4.4)
+    crack (0.4.4)
+    diff-lcs (1.5.0)
     fakeweb (1.3.0)
     httparty (0.18.1)
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
-    mime-types (3.3.1)
+    mime-types (3.4.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2020.1104)
+    mime-types-data (3.2022.0105)
     multi_xml (0.6.0)
+    rexml (3.2.5)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
@@ -32,7 +33,6 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.5.0)
     rspec-support (3.5.0)
-    safe_yaml (1.0.5)
 
 PLATFORMS
   ruby
@@ -44,4 +44,4 @@ DEPENDENCIES
   ruby-pardot!
 
 BUNDLED WITH
-   2.2.7
+   2.3.6
diff --git a/ruby-pardot.gemspec b/ruby-pardot.gemspec
index 3bb4192..78a11ef 100644
--- a/ruby-pardot.gemspec
+++ b/ruby-pardot.gemspec
@@ -16,7 +16,8 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = ">= 1.3.6"
   s.rubyforge_project         = "ruby-pardot"
 
-  s.add_dependency 'crack', '0.4.3'
+  s.add_dependency 'crack', '0.4.4'
+  s.add_dependency 'rexml', '3.2.5'
   s.add_dependency 'httparty', '0.18.1'
 
   s.add_development_dependency "bundler", ">= 1.10"