diff --git a/Gemfile.lock b/Gemfile.lock
index 88e5b2e..599666d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     sift-partner (0.1.0)
-      httparty (~> 0.13.1)
+      httparty (>= 0.13.1, < 0.22.0)
       multi_json (~> 1.0)
       sift (~> 1.1.7)
 
@@ -13,12 +13,12 @@ GEM
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
     diff-lcs (1.2.5)
-    httparty (0.13.7)
-      json (~> 1.8)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
-    json (1.8.3)
-    multi_json (1.12.1)
-    multi_xml (0.5.5)
+    mini_mime (1.1.2)
+    multi_json (1.15.0)
+    multi_xml (0.6.0)
     rake (11.1.2)
     rspec (2.99.0)
       rspec-core (~> 2.99.0)
diff --git a/sift-partner.gemspec b/sift-partner.gemspec
index da507cd..8f52c74 100644
--- a/sift-partner.gemspec
+++ b/sift-partner.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency("rake", "~> 11.0")
 
   # Gems that must be intalled for sift to work
-  s.add_dependency "httparty", "~> 0.13.1"
+  s.add_dependency "httparty", ">= 0.13.1", "< 0.22.0"
   s.add_dependency "multi_json", "~> 1.0"
   s.add_dependency "sift", "~> 1.1.7"
 end