diff --git a/Gemfile.lock b/Gemfile.lock
index 39c8d84..20482b4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,17 +5,29 @@ PATH
       directory_watcher (~> 1.3.0)
       json (~> 1.8.0)
       mime-types (~> 1.16)
-      rest-client (~> 1.6.0)
+      rest-client (>= 1.6, < 2.2)
 
 GEM
   remote: http://rubygems.org/
   specs:
     directory_watcher (1.3.2)
-    json (1.8.1)
+    domain_name (0.5.20190701)
+      unf (>= 0.0.5, < 1.0.0)
+    http-accept (1.7.0)
+    http-cookie (1.0.3)
+      domain_name (~> 0.5)
+    json (1.8.6)
     mime-types (1.25.1)
-    rest-client (1.6.7)
-      mime-types (>= 1.16)
+    netrc (0.11.0)
+    rest-client (2.1.0)
+      http-accept (>= 1.7.0, < 2.0)
+      http-cookie (>= 1.0.2, < 2.0)
+      mime-types (>= 1.16, < 4.0)
+      netrc (~> 0.8)
     rspec (1.3.1)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.6)
 
 PLATFORMS
   ruby
diff --git a/couch_docs.gemspec b/couch_docs.gemspec
index 15a803f..b8d2da0 100644
--- a/couch_docs.gemspec
+++ b/couch_docs.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "rspec", ["~> 1.3.0"]
 
-  s.add_runtime_dependency(%q<rest-client>, ["~> 1.6.0"])
+  s.add_runtime_dependency(%q<rest-client>, ">= 1.6", "< 2.2")
   s.add_runtime_dependency(%q<json>, ["~> 1.8.0"])
   s.add_runtime_dependency(%q<directory_watcher>, ["~> 1.3.0"])
   s.add_runtime_dependency(%q<mime-types>, ["~> 1.16"])