diff --git a/RELEASE.md b/RELEASE.md
index 2072236..c06dbcf 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,4 +1,4 @@
-# Current version (not yet released; still in development)
+# Version 0.21.1
 
 ## Major Features and Improvements
 
@@ -10,6 +10,11 @@
 
 ## Breaking changes
 
+* The removal of `lift_series` from `CategoricalCrossStats` and the change of
+  type of `LiftSeries.LiftValue.lift` from float to double will cause parsing
+  failures for serialized protos written written by version 0.21.0 which
+  contained the deleted or changed fields.
+
 ## Deprecations
 
 # Version 0.21.0
diff --git a/tensorflow_metadata/version.py b/tensorflow_metadata/version.py
index 19e2d7c..a0caa70 100644
--- a/tensorflow_metadata/version.py
+++ b/tensorflow_metadata/version.py
@@ -14,4 +14,4 @@
 """Contains the version string of TFMD."""
 
 # Note that setup.py uses this version.
-__version__ = '0.21.1dev'
+__version__ = '0.21.1'