diff --git a/lib/instapaper/api/oauth.rb b/lib/instapaper/api/oauth.rb
index 995eee8..3c74940 100644
--- a/lib/instapaper/api/oauth.rb
+++ b/lib/instapaper/api/oauth.rb
@@ -7,7 +7,7 @@ module Instapaper
     module OAuth
       # Gets an OAuth access token for a user.
       def access_token(username, password)
-        response = perform_post_with_unparsed_response('/api/1/oauth/access_token', x_auth_username: username, x_auth_password: password, x_auth_mode: 'client_auth')
+        response = perform_post_with_unparsed_response('/api/1.1/oauth/access_token', x_auth_username: username, x_auth_password: password, x_auth_mode: 'client_auth')
         parsed_response = QLineParser.parse(response)
         fail Instapaper::Error::OAuthError, parsed_response['error'] if parsed_response.key?('error')
         Instapaper::Credentials.new(parsed_response)
diff --git a/spec/instapaper/api/oauth_spec.rb b/spec/instapaper/api/oauth_spec.rb
index a6b522c..c132705 100644
--- a/spec/instapaper/api/oauth_spec.rb
+++ b/spec/instapaper/api/oauth_spec.rb
@@ -5,15 +5,15 @@ describe Instapaper::Client::OAuth do
 
   describe '#token' do
     before do
-      stub_post('/api/1/oauth/access_token').with(body: {x_auth_username: 'ohai', x_auth_password: 'p455w0rd', x_auth_mode: 'client_auth'})
+      stub_post('/api/1.1/oauth/access_token').with(body: {x_auth_username: 'ohai', x_auth_password: 'p455w0rd', x_auth_mode: 'client_auth'})
         .to_return(body: fixture('access_token.txt'), headers: {content_type: 'text/plain; charset=utf-8'})
-      stub_post('/api/1/oauth/access_token').with(body: {x_auth_username: 'inval1d', x_auth_password: 'cr3dentials', x_auth_mode: 'client_auth'})
+      stub_post('/api/1.1/oauth/access_token').with(body: {x_auth_username: 'inval1d', x_auth_password: 'cr3dentials', x_auth_mode: 'client_auth'})
         .to_return(body: fixture('invalid_credentials.txt'), headers: {content_type: 'text/plain; charset=utf-8'})
     end
 
     it 'gets the correct resource' do
       client.access_token('ohai', 'p455w0rd')
-      expect(a_post('/api/1/oauth/access_token'))
+      expect(a_post('/api/1.1/oauth/access_token'))
         .to have_been_made
     end