diff --git a/source/whats-new.txt b/source/whats-new.txt
index e31ddc67..63eb44f6 100644
--- a/source/whats-new.txt
+++ b/source/whats-new.txt
@@ -28,10 +28,6 @@ following versions of the {+php-library+}:
 
 * :ref:`Version 1.17 <php-lib-version-1.17>`
 
-* :ref:`Version 1.16 <php-lib-version-1.16>`
-
-* :ref:`Version 1.15 <php-lib-version-1.15>`
-
 .. _php-lib-version-1.20:
 
 What's New in 1.20
@@ -118,41 +114,4 @@ What's New in 1.17
   7.2 and 7.3 has been removed and the library now requires PHP 7.4 or newer.
 
 To learn more about this release, see the `v1.17 Release Notes 
-<https://github.com/mongodb/mongo-php-library/releases/tag/1.17.0>`__ on GitHub.
-
-.. _php-lib-version-1.16:
-
-What's New in 1.16
-------------------
-
-- Introduces support for :v7.0:`MongoDB 7.0 </release-notes/7.0>`. 
-
-- Introduces :phpmethod:`MongoDB\Database::createEncryptedCollection()`. 
-  This method automatically creates data encryption keys when creating a new 
-  encrypted collection.
-
-- Upgrades the ``mongodb`` extension requirement to 1.16.0.
-
-To learn more about this release, see the `v1.16 Release Notes 
-<https://github.com/mongodb/mongo-php-library/releases/tag/1.16.0>`__ on GitHub.
-
-.. _php-lib-version-1.15:
-
-What's New in 1.15
-------------------
-
-- Adds new ``examples/`` and ``tools/`` directories to the library repository, 
-  which contain code snippets and scripts that may prove useful when writing 
-  or debugging applications. These directories are intended to 
-  supplement the library's existing documentation and will be added to over time.
-
-- Adds various backwards compatible typing improvements throughout the
-  library. Downstream impact for these changes are discussed in 
-  `UPGRADE-1.15.md <https://github.com/mongodb/mongo-php-library/blob/1.15.0/UPGRADE-1.15.md>`__. 
-  
-- Integrates `Psalm <https://psalm.dev/>`__ for static analysis.
-
-- Upgrades the ``mongodb`` extension requirement to 1.15.0.
-
-To learn more about this release, see the `v1.15 Release Notes 
-<https://github.com/mongodb/mongo-php-library/releases/tag/1.15.0>`__ on GitHub.
+<https://github.com/mongodb/mongo-php-library/releases/tag/1.17.0>`__ on GitHub.
\ No newline at end of file