diff --git a/sdk/digitaltwins/Azure.DigitalTwins.Core/CHANGELOG.md b/sdk/digitaltwins/Azure.DigitalTwins.Core/CHANGELOG.md
index b692ce9f4476..e49e911aba61 100644
--- a/sdk/digitaltwins/Azure.DigitalTwins.Core/CHANGELOG.md
+++ b/sdk/digitaltwins/Azure.DigitalTwins.Core/CHANGELOG.md
@@ -1,7 +1,10 @@
 # Release History
 
-## 1.3.0-beta.1 (Unreleased)
+## 1.2.1 (2021-02-03)
 
+### Fixes and improvements
+
+- Fixed an issue with Query APIs when `DigitalTwinsClient` has been initialized with a non-default `ObjectSerializer`.
 
 ## 1.2.0 (2020-11-16)
 
diff --git a/sdk/digitaltwins/Azure.DigitalTwins.Core/src/Azure.DigitalTwins.Core.csproj b/sdk/digitaltwins/Azure.DigitalTwins.Core/src/Azure.DigitalTwins.Core.csproj
index 849242109b3e..2b952553c9a2 100644
--- a/sdk/digitaltwins/Azure.DigitalTwins.Core/src/Azure.DigitalTwins.Core.csproj
+++ b/sdk/digitaltwins/Azure.DigitalTwins.Core/src/Azure.DigitalTwins.Core.csproj
@@ -13,7 +13,7 @@
   <PropertyGroup>
     <PackageTags>IoT;DigitalTwins;$(PackageCommonTags)</PackageTags>
     <Description>SDK for the Azure Digital Twins service</Description>
-    <Version>1.3.0-beta.1</Version>
+    <Version>1.2.1</Version>
     <ApiCompatVersion>1.2.0</ApiCompatVersion>
   </PropertyGroup>