diff --git a/api/docs/v2/conf.py b/api/docs/v2/conf.py
index 708d800ce3e..c8d1e8e7f97 100644
--- a/api/docs/v2/conf.py
+++ b/api/docs/v2/conf.py
@@ -99,7 +99,7 @@
 # use rst_prolog to hold the subsitution
 # update the apiLevel value whenever a new minor version is released
 rst_prolog = f"""
-.. |apiLevel| replace:: 2.20
+.. |apiLevel| replace:: 2.21
 .. |release| replace:: {release}
 """
 
diff --git a/api/docs/v2/versioning.rst b/api/docs/v2/versioning.rst
index 72430f9104f..004610a7f75 100644
--- a/api/docs/v2/versioning.rst
+++ b/api/docs/v2/versioning.rst
@@ -68,7 +68,7 @@ The maximum supported API version for your robot is listed in the Opentrons App
 
 If you upload a protocol that specifies a higher API level than the maximum supported, your robot won't be able to analyze or run your protocol. You can increase the maximum supported version by updating your robot software and Opentrons App. 
 
-Opentrons robots running the latest software (8.0.0) support the following version ranges: 
+Opentrons robots running the latest software (8.2.0) support the following version ranges: 
 
     * **Flex:** version 2.15–|apiLevel|.
     * **OT-2:** versions 2.0–|apiLevel|.
@@ -84,6 +84,8 @@ This table lists the correspondence between Protocol API versions and robot soft
 +-------------+------------------------------+
 | API Version | Introduced in Robot Software |
 +=============+==============================+
+|     2.21    |          8.2.0               |
++-------------+------------------------------+
 |     2.20    |          8.0.0               |
 +-------------+------------------------------+
 |     2.19    |          7.3.1               |
@@ -134,6 +136,12 @@ This table lists the correspondence between Protocol API versions and robot soft
 Changes in API Versions
 =======================
 
+Version 2.21
+------------
+- Adds :py:class:`.AbsorbanceReaderContext` to support the :ref:`Absorbance Plate Reader Module <absorbance-plate-reader-module>`. Use the load name ``absorbanceReaderV1`` with :py:meth:`.ProtocolContext.load_module` to add a Heater-Shaker to a protocol.
+- :ref:`Liquid presence detection <lpd>` now only checks on the first aspiration of the :py:meth:`.mix` cycle.
+- Improved the run log output of :py:meth:`.ThermocyclerContext.execute_profile`.
+
 Version 2.20
 ------------