diff --git a/Gemfile.lock b/Gemfile.lock
index d5aa7ca..b97f045 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,12 +15,17 @@ GEM
     debugger-linecache (1.2.0)
     debugger-ruby_core_source (1.3.7)
     diff-lcs (1.2.5)
+    domain_name (0.5.20190701)
+      unf (>= 0.0.5, < 1.0.0)
+    http-cookie (1.0.5)
+      domain_name (~> 0.5)
     i18n (0.6.11)
     json (1.8.1)
-    mime-types (2.4.3)
+    mime-types (2.99.3)
     minitest (5.4.3)
-    netrc (0.8.0)
-    rest-client (1.7.2)
+    netrc (0.11.0)
+    rest-client (1.8.0)
+      http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
     rspec (3.1.0)
@@ -38,6 +43,9 @@ GEM
     thread_safe (0.3.4)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.8.2)
 
 PLATFORMS
   ruby
diff --git a/adzerk.gemspec b/adzerk.gemspec
index f126cf1..e4f5264 100644
--- a/adzerk.gemspec
+++ b/adzerk.gemspec
@@ -13,6 +13,6 @@ Gem::Specification.new do |s|
   s.homepage      = "http://adzerk.com"
   s.add_development_dependency "rspec", "= 2.11.0"
   s.add_runtime_dependency "json", "= 1.8.1"
-  s.add_runtime_dependency "rest-client", "= 1.6.7"
+  s.add_runtime_dependency "rest-client", "= 1.8.0"
   s.add_runtime_dependency "activesupport", ">= 3.2.8"
 end