diff --git a/Gemfile.lock b/Gemfile.lock
index 529bf05..daf8e2d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,23 +2,32 @@ PATH
   remote: .
   specs:
     ip2asn (1.0.1)
-      rest-client (~> 1.7.3)
+      rest-client (>= 1.7.3, < 2.2.0)
       unirest
 
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     diff-lcs (1.3)
-    json (2.1.0)
-    mime-types (2.99.3)
+    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 (2.3.1)
+    mime-types (3.3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2020.0512)
     netrc (0.11.0)
-    public_suffix (3.0.2)
+    public_suffix (4.0.6)
     rake (10.5.0)
-    rest-client (1.7.3)
-      mime-types (>= 1.16, < 3.0)
-      netrc (~> 0.7)
+    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 (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -32,6 +41,9 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.7)
     unirest (1.0.8)
       addressable
       json
diff --git a/ip2asn.gemspec b/ip2asn.gemspec
index d3c4b6c..0c891b6 100644
--- a/ip2asn.gemspec
+++ b/ip2asn.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   
   spec.add_dependency "unirest"
-  spec.add_dependency "rest-client", "~> 1.7.3"
+  spec.add_dependency "rest-client", ">= 1.7.3", "< 2.2.0"
   spec.add_development_dependency "bundler", "~> 1.16"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"