diff --git a/Gemfile.lock b/Gemfile.lock
index 1970cd2..f574061 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,17 +7,25 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.2.12)
-      activesupport (= 3.2.12)
-      builder (~> 3.0.0)
-    activeresource (3.2.12)
-      activemodel (= 3.2.12)
-      activesupport (= 3.2.12)
-    activesupport (3.2.12)
-      i18n (~> 0.6)
-      multi_json (~> 1.0)
-    builder (3.0.4)
+    activemodel (6.0.6.1)
+      activesupport (= 6.0.6.1)
+    activemodel-serializers-xml (1.0.3)
+      activemodel (>= 5.0.0.a)
+      activesupport (>= 5.0.0.a)
+      builder (~> 3.1)
+    activeresource (5.1.1)
+      activemodel (>= 5.0, < 7)
+      activemodel-serializers-xml (~> 1.0)
+      activesupport (>= 5.0, < 7)
+    activesupport (6.0.6.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
+    builder (3.3.0)
     coderay (1.0.8)
+    concurrent-ruby (1.3.5)
     diff-lcs (1.1.3)
     factory_girl (2.1.2)
       activesupport
@@ -33,16 +41,17 @@ GEM
       thor (>= 0.14.6)
     guard-rspec (0.5.11)
       guard (>= 0.8.4)
-    i18n (0.6.1)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     listen (0.7.2)
     lumberjack (1.0.2)
     method_source (0.8.1)
-    multi_json (1.6.1)
+    minitest (5.25.5)
     pry (0.9.12)
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rake (0.9.6)
+    rake (12.3.3)
     rb-fsevent (0.9.3)
     rspec (2.7.0)
       rspec-core (~> 2.7.0)
@@ -55,6 +64,10 @@ GEM
     slop (3.4.3)
     terminal-table (1.4.5)
     thor (0.17.0)
+    thread_safe (0.3.6)
+    tzinfo (1.2.11)
+      thread_safe (~> 0.1)
+    zeitwerk (2.7.2)
 
 PLATFORMS
   ruby
@@ -66,6 +79,6 @@ DEPENDENCIES
   fakeweb (~> 1.3.0)
   growl (~> 1.0.3)
   guard-rspec (~> 0.5.0)
-  rake (~> 0.9.2)
+  rake (~> 12.3.3)
   rb-fsevent (~> 0.9.2)
   rspec (~> 2.7.0)
diff --git a/chargify_api_ares.gemspec b/chargify_api_ares.gemspec
index 6e00603..f7bca47 100644
--- a/chargify_api_ares.gemspec
+++ b/chargify_api_ares.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency('activeresource', '>= 2.3.5')
 
   # Development Dependencies
-  s.add_development_dependency('rake', '~> 0.9.2')
+  s.add_development_dependency('rake', '~> 12.3.3')
   s.add_development_dependency('rspec', '~> 2.7.0')
   s.add_development_dependency('factory_girl', '~> 2.1.0')
   s.add_development_dependency('fakeweb', '~> 1.3.0')