diff --git a/lib/buttercms-ruby.rb b/lib/buttercms-ruby.rb
index b0d634c..e7e7697 100644
--- a/lib/buttercms-ruby.rb
+++ b/lib/buttercms-ruby.rb
@@ -92,6 +92,8 @@ def self.api_request(path, options = {})
     case response
     when Net::HTTPNotFound
       raise ::ButterCMS::NotFound, JSON.parse(response.body)["detail"]
+    when Net::HTTPUnauthorized
+      raise ::ButterCMS::Unauthorized, JSON.parse(response.body)['detail']
     end
 
     response.body
diff --git a/lib/buttercms/errors.rb b/lib/buttercms/errors.rb
index 8e727ee..2a9a3f8 100644
--- a/lib/buttercms/errors.rb
+++ b/lib/buttercms/errors.rb
@@ -6,6 +6,9 @@ class Error < StandardError
   # NotFound is raised when a resource cannot be found
   class NotFound < Error
   end
+
+  class Unauthorized < Error
+  end
   
   class BadRequest < Error
   end
diff --git a/lib/buttercms/version.rb b/lib/buttercms/version.rb
index 2ee9ec9..8eb5605 100644
--- a/lib/buttercms/version.rb
+++ b/lib/buttercms/version.rb
@@ -1,3 +1,3 @@
 module ButterCMS
-  VERSION = '2.2'
+  VERSION = '2.3'
 end
diff --git a/spec/lib/butter-ruby_spec.rb b/spec/lib/butter-ruby_spec.rb
index 0b4d56b..78f0660 100644
--- a/spec/lib/butter-ruby_spec.rb
+++ b/spec/lib/butter-ruby_spec.rb
@@ -50,5 +50,18 @@
 
       expect(request).to have_been_made
     end
+
+    it "raises Unauthorized on 401" do
+      allow(ButterCMS).to receive(:api_token).and_return("test")
+
+      request = stub_request(:get, %r{/posts/slug/})
+        .with(query: { auth_token: "test" })
+        .to_return(status: 401, body: '{"detail":"Invalid token."}')
+
+      expect { ButterCMS.request("/posts/slug/") }
+        .to raise_error(ButterCMS::Unauthorized)
+
+      expect(request).to have_been_made
+    end
   end
 end