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Klaviyo · Version history

Klaviyo changelog and version history

Latest version
3.9.0
Oct 28, 2026 (12 days ago)
Releases
85
since 2012
In the last year
9
about one every 41 days
Tested up to
WordPress 7.0.8
PHP 7.4 or later

Releases each year

  • 20123 releases
  • 20131 release
  • 20141 release
  • 20173 releases
  • 20195 releases
  • 202020 releases
  • 20219 releases
  • 20226 releases
  • 202316 releases
  • 20247 releases
  • 20256 releases
  • 20268 releases

20268 releases

  1. Klaviyo 3.9.0Latest

    • Changed – Register the checkout consent block with Block API version 3. WordPress 6.9 made version 2 deprecated and wrote a warning to the editor console. The block now renders inside the iframe editor.
    • Changed – Raise the minimum versions to PHP 7.4, WordPress 6.2 and WooCommerce 8.2, matching WooCommerce 8.2’s requirements.
    • Fixed – Stop the Checkout block from recording two Started Checkout events for one email entry. The classic checkout script no longer listens to the Checkout block’s email and name fields, and the Checkout block skips Started Checkout for an email already tracked on the page.
    • Security – Load klaviyo.js and the email signup widget assets over an explicit https:// URL instead of a protocol-relative // URL. Storefronts no longer lose 50 points on the MDN HTTP Observatory subresource-integrity check.

  2. Klaviyo 3.8.3

    • Security – Sign outgoing custom/* webhooks (options, remove, consent) with an HMAC signature, matching WooCommerce’s native webhook signing scheme.

  3. Klaviyo 3.8.2

    • Security – The legacy WooCommerce API validator used by the products endpoints now also accepts credentials via header, matching the fix already applied to the other authenticated endpoints.

  4. Klaviyo 3.8.1

    • Fixed – Register WooCommerce checkout block scripts in the footer to silence WooCommerce dependency console warnings on block checkout pages.
    • Security – WooCommerce API credentials are now sent via a request header instead of the URL. Older plugin versions calling into this endpoint continue to work via the previous method.

  5. Klaviyo 3.8.0

    • Added – Enables WhatsApp consent at checkout.
    • Fixed – Debounce klaviyo.identify() in WooCommerce Blocks checkout to prevent duplicate profiles when typing email addresses.

  6. Klaviyo 3.7.5

    • Changed – Update private API key validation to support new key format.

  7. Klaviyo 3.7.4

    • Changed – Update Klaviyo backend API revision to 2026-04-15.

  8. Klaviyo 3.7.3

    • Changed – Improve public key form validation for installs without WooCommerce.
    • Fixed – Only enqueue script with handle kl-identify-browser using same logic for dependency.
    • Fixed – Fix PHP 8.5 property visibility.

20256 releases

  1. Klaviyo 3.7.2

    • Changed – Update Klaviyo backend API revision to 2025-10-15.

  2. Klaviyo 3.7.1

    • Added – Include country code in email consent webhook.
    • Changed – Updates kl_checkout_item hook to include $values representing full cart item data.
    • Removed – Don’t send version webhook to Klaviyo on update nor when plugin version goes out of date.
    • Fixed – Fix PHP warning for passing null value to strpos() in kla-admin.php
    • Fixed – PHP warning for undefined “billing_address” in StoreApi.php

  3. Klaviyo 3.7.0

    • Added – Support for anonymous visitor activity backfill (AVAB) when enabled in Klaviyo account.
    • Changed – Updates API function names to avoid potential conflicts.
    • Changed – Merge __kla_id cookie values during checkout.

  4. Klaviyo 3.6.0

    • Added – Added admin notices to /plugins view on wordpress dashboard to prompt reviews after 60 days
    • Fixed – JSON param access of billing address during checkout consent processing.
    • Fixed – URI-encode checkout cookie.

  5. Klaviyo 3.5.0

    • Changed – Update Klaviyo backend API revision to 2025-04-15

  6. Klaviyo 3.4.3

    • Changed – Explicitly pass default value of param to htmlspecialchars() for cross-version compatibility.
    • Changed – Update WooCommerce <> Klaviyo logo asset.
    • Fixed – Incorrect option accessor used in deprecated settings form.
    • Fixed – Resolved deprecated warning triggered by calls to strtotime().

20247 releases

  1. Klaviyo 3.4.2

    • Fixed – Tweak order of checkout block hooks for better compatibility.

  2. Klaviyo 3.4.1

    • Changed – Add price info at top level for Viewed Product events.
    • Fixed – Load Klaviyo core functions after WooCommerce plugin is initialized.

  3. Klaviyo 3.4.0

    • Added – Adds license information to readme.txt
    • Changed – Updates klaviyo onsite javascript url to the new format
    • Fixed – Update plugins TypeError when saved transient value is not an object.
    • Fixed – Avoid conflict with Woo Pay.

  4. Klaviyo 3.3.5

    • Added – Notifications for common setup issues from settings page.

  5. Klaviyo 3.3.4

    • Fixed – Fix deprecation warning for dynamic properties.

  6. Klaviyo 3.0.13+v3api

  7. Klaviyo 3.0.7+v3api

202316 releases

  1. Klaviyo 3.3.3

    • Fixed – Fix newsletter checkboxes validation.
    • Fixed – Move Added to Cart ‘value’ property up a level.

  2. Klaviyo 3.3.2

    • Fixed – Fixed tracking on checkout pages that show the shipping form by default

  3. Klaviyo 3.3.1

    • Fixed – Update events call payload to have brand parity with V1/V2 APIs

  4. Klaviyo 3.3.0

    • Added – New Klaviyo onsite object
    • Added – New X-Klaviyo-User-Agent to headers to collect plugin usage meta data
    • Added – Added support for V3 APIs /client/events and /client/profiles
    • Added – Added user tracking support on both shortcode and block checkout page types
    • Removed – Support for V2 APIs: /track and /identify
    • Removed – Removed _learnq onsite object in favor of klaviyo object

  5. Klaviyo 3.2.2

    • Changed – Klaviyo settings link nested under Marketing tab if WooCommerce is installed.
    • Deprecated – Deprecate getVersion method in favor of get_version to meet WP convention.
    • Removed – Role creation and removal during install/uninstall.
    • Fixed – Only include WooCommerce Checkout Block compatibility if StoreApi is supported.

  6. Klaviyo 3.2.1

    • Fixed – Add paginate arg to order query to access total order count.

  7. Klaviyo 3.2.0

  8. Klaviyo 3.1.0

  9. Klaviyo 3.0.13

  10. Klaviyo 3.0.12

  11. Klaviyo 3.0.11

  12. Klaviyo 3.0.10

  13. Klaviyo 3.0.9

  14. Klaviyo 3.0.8

  15. Klaviyo 3.0.7

  16. Klaviyo 3.0.6

20226 releases

  1. Klaviyo 3.0.5

  2. Klaviyo 3.0.4

  3. Klaviyo 3.0.3

  4. Klaviyo 3.0.2

  5. Klaviyo 3.0.1

  6. Klaviyo 3.0.0

20219 releases

  1. Klaviyo 2.5.5

  2. Klaviyo 2.5.4

  3. Klaviyo 2.5.3

  4. Klaviyo 2.5.2

  5. Klaviyo 2.5.1

  6. Klaviyo 2.5.0

  7. Klaviyo 2.4.2

  8. Klaviyo 2.4.1

  9. Klaviyo 2.4.0

202020 releases

  1. Klaviyo 2.3.6

  2. Klaviyo 2.3.5

  3. Klaviyo 2.3.4

  4. Klaviyo 2.3.3

  5. Klaviyo 2.3.2

  6. Klaviyo 2.3.1

  7. Klaviyo 2.3.0

  8. Klaviyo 2.2.6

  9. Klaviyo 2.2.5

  10. Klaviyo 2.2.4

  11. Klaviyo 2.2.3

  12. Klaviyo 2.2.2

  13. Klaviyo 2.2.1

  14. Klaviyo 2.2.0

  15. Klaviyo 2.1.9

  16. Klaviyo 2.1.8

  17. Klaviyo 2.1.7

  18. Klaviyo 2.1.6

  19. Klaviyo 2.1.5

  20. Klaviyo 2.1.4

20195 releases

  1. Klaviyo 2.1.3

  2. Klaviyo 2.1.2

  3. Klaviyo 2.1.0

  4. Klaviyo 1.3.3

  5. Klaviyo 2.1.1

20173 releases

  1. Klaviyo 1.3.2

  2. Klaviyo 1.3.1

  3. Klaviyo 1.3

20141 release

  1. Klaviyo 1.2

20131 release

  1. Klaviyo 1.1.2

20123 releases

  1. Klaviyo 1.1.1

  2. Klaviyo 1.1

  3. Klaviyo 1.0

Questions about Klaviyo’s releases

What is the latest version of Klaviyo?

3.9.0, released on Oct 28, 2026 (1 week ago). It’s tested up to WordPress 7.0.8 and needs PHP 7.4 or later.

How often is Klaviyo updated?

9 releases in the last year, about one every 41 days. Its first release on WordPress.org dates from April 2012.

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Release dates come from the day each version’s folder was made in Klaviyo’s WordPress.org SVN repository; the notes from its readme’s changelog, as its authors wrote it.