diff --git a/Changelog.org b/Changelog.org
index a316797..56b969e 100644
--- a/Changelog.org
+++ b/Changelog.org
@@ -24,6 +24,8 @@
        2. Variable ~anki-editor-html-head~
        3. Command ~anki-editor-copy-styles~
        4. Command ~anki-editor-remove-styles~
+   11. Updated anki-connect to version 6
+       1. ~anki-editor-api-upgrade~ removed
 
 ** v0.3.3
 
diff --git a/README.org b/README.org
index eed286b..74e0366 100644
--- a/README.org
+++ b/README.org
@@ -73,7 +73,6 @@ there are any ambiguity or grammatical mistakes ;-)/
    | anki-editor-export-subtree-to-html | Export the subtree at point to HTML.                                                                                           |
    | anki-editor-convert-region-to-html | Convert and replace region to HTML.                                                                                            |
    | anki-editor-api-check              | Check if correct version of AnkiConnect is running.                                                                            |
-   | anki-editor-api-upgrade            | Upgrade AnkiConnect.                                                                                                           |
    | anki-editor-sync-collections       | Synchronize your local anki collection.                                                                                        |
    | anki-editor-gui-browse             | Open Anki Browser with a query for current note or deck.                                                                       |
    | anki-editor-gui-add-cards          | Open Anki Add Cards dialog with presets from current note entry.                                                               |
diff --git a/anki-editor.el b/anki-editor.el
index d2c7b4e..4fec8be 100644
--- a/anki-editor.el
+++ b/anki-editor.el
@@ -121,7 +121,7 @@ For example, you can put custom styles or scripts in this variable."
 
 ;;; AnkiConnect
 
-(defconst anki-editor-api-version 5)
+(defconst anki-editor-api-version 6)
 
 (cl-defun anki-editor--fetch (url
                               &rest settings
@@ -898,21 +898,6 @@ When note heading is not provided, it is used as the first field."
       (error "anki-editor requires minimal version %d of AnkiConnect installed"
              anki-editor-api-version))))
 
-(defun anki-editor-api-upgrade ()
-  "Upgrade AnkiConnect to the latest version.
-
-This will display a confirmation dialog box in Anki asking if you
-want to continue.  The upgrading is done by downloading the latest
-code in the master branch of its Github repo.
-
-This is useful when new version of this package depends on the
-bugfixes or new features of AnkiConnect."
-  (interactive)
-  (when (yes-or-no-p "This is going to download the latest AnkiConnect from the Internet to your computer, do you want to continue? ")
-    (let ((result (anki-editor-api-call-result 'upgrade)))
-      (when (and (booleanp result) result)
-        (message "AnkiConnect has been upgraded, you might have to restart Anki for the changes to take effect.")))))
-
 (defun anki-editor-sync-collections ()
   "Synchronizes the local anki collections with ankiweb."
   (interactive)