diff --git a/lib/instapaper/api/folders.rb b/lib/instapaper/api/folders.rb
index 9488d70..434460d 100644
--- a/lib/instapaper/api/folders.rb
+++ b/lib/instapaper/api/folders.rb
@@ -7,19 +7,19 @@ module Instapaper
       # List the account's user-created folders.
       # @note This only includes organizational folders and does not include RSS-feed folders or starred-subscription folders
       def folders
-        perform_post_with_objects('/api/1/folders/list', {}, Instapaper::Folder)
+        perform_post_with_objects('/api/1.1/folders/list', {}, Instapaper::Folder)
       end
 
       # Creates an organizational folder.
       # @param title [String] The title of the folder to create
       def add_folder(title)
-        perform_post_with_object('/api/1/folders/add', {title: title}, Instapaper::Folder)
+        perform_post_with_object('/api/1.1/folders/add', {title: title}, Instapaper::Folder)
       end
 
       # Deletes the folder and moves any articles in it to the Archive.
       # @param folder_id [String] The id of the folder.
       def delete_folder(folder_id)
-        perform_post_with_unparsed_response('/api/1/folders/delete', folder_id: folder_id)
+        perform_post_with_unparsed_response('/api/1.1/folders/delete', folder_id: folder_id)
         true
       end
 
@@ -28,7 +28,7 @@ module Instapaper
       # @example Ordering folder_ids 100, 200, and 300
       #   Instapaper.set_order(['100:1','200:2','300:3'])
       def set_order(order = []) # rubocop:disable Style/AccessorMethodName
-        perform_post_with_objects('/api/1/folders/set_order', {order: order.join(',')}, Instapaper::Folder)
+        perform_post_with_objects('/api/1.1/folders/set_order', {order: order.join(',')}, Instapaper::Folder)
       end
     end
   end
diff --git a/spec/instapaper/api/folders_spec.rb b/spec/instapaper/api/folders_spec.rb
index 2d689c9..3185889 100644
--- a/spec/instapaper/api/folders_spec.rb
+++ b/spec/instapaper/api/folders_spec.rb
@@ -5,13 +5,13 @@ describe Instapaper::Client::Folders do
 
   describe '#folders' do
     before do
-      stub_post('/api/1/folders/list')
+      stub_post('/api/1.1/folders/list')
         .to_return(body: fixture('folders_list.json'), headers: {content_type: 'application/json; charset=utf-8'})
     end
 
     it 'gets the correct resource' do
       client.folders
-      expect(a_post('/api/1/folders/list'))
+      expect(a_post('/api/1.1/folders/list'))
         .to have_been_made
     end
 
@@ -25,13 +25,13 @@ describe Instapaper::Client::Folders do
 
   describe '#add_folder' do
     before do
-      stub_post('/api/1/folders/add').with(body: {title: 'Ruby'})
+      stub_post('/api/1.1/folders/add').with(body: {title: 'Ruby'})
         .to_return(body: fixture('folders_add.json'), headers: {content_type: 'application/json; charset=utf-8'})
     end
 
     it 'gets the correct resource' do
       client.add_folder('Ruby')
-      expect(a_post('/api/1/folders/add'))
+      expect(a_post('/api/1.1/folders/add'))
         .to have_been_made
     end
 
@@ -43,13 +43,13 @@ describe Instapaper::Client::Folders do
 
   describe '#delete_folder' do
     before do
-      stub_post('/api/1/folders/delete'). with(body: {folder_id: '1'})
+      stub_post('/api/1.1/folders/delete'). with(body: {folder_id: '1'})
         .to_return(body: fixture('folders_delete.json'), headers: {content_type: 'application/json; charset=utf-8'})
     end
 
     it 'gets the correct resource' do
       client.delete_folder('1')
-      expect(a_post('/api/1/folders/delete'))
+      expect(a_post('/api/1.1/folders/delete'))
         .to have_been_made
     end
 
@@ -61,13 +61,13 @@ describe Instapaper::Client::Folders do
 
   describe '#set_order' do
     before do
-      stub_post('/api/1/folders/set_order'). with(body: {order: '1121173:2,1121174:1'})
+      stub_post('/api/1.1/folders/set_order'). with(body: {order: '1121173:2,1121174:1'})
         .to_return(body: fixture('folders_set_order.json'), headers: {content_type: 'application/json; charset=utf-8'})
     end
 
     it 'gets the correct resource' do
       client.set_order(['1121173:2', '1121174:1'])
-      expect(a_post('/api/1/folders/set_order'))
+      expect(a_post('/api/1.1/folders/set_order'))
         .to have_been_made
     end