diff --git a/CHANGELOG.md b/CHANGELOG.md
index b040dbc70..4e28a44b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # CHANGELOG
 
+## 0.2.1
+
+#### Fixes
+
+- Fixed the library being incompatible with kotlinx.serialization 1.2.0 and above ([#118](https://github.com/Kotlin/kotlinx-datetime/issues/118)).
+
+#### Features
+
+- `watchosX64` target support. In practice, this means the ability to run projects that depend on this library in the iOS Simulator for Apple Watch.
+
 ## 0.2.0
 
 #### Fixes
diff --git a/README.md b/README.md
index 185a15418..5135d3511 100644
--- a/README.md
+++ b/README.md
@@ -268,7 +268,7 @@ kotlin {
     sourceSets {
         commonMain {
              dependencies {
-                 implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.2.0")
+                 implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.2.1")
              }
         }
     }
@@ -279,7 +279,7 @@ kotlin {
 
 ```groovy
 dependencies {
-    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.2.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.2.1")
 }
 ```
 
@@ -319,7 +319,7 @@ Add a dependency to the `<dependencies>` element. Note that you need to use the
 <dependency>
     <groupId>org.jetbrains.kotlinx</groupId>
     <artifactId>kotlinx-datetime-jvm</artifactId>
-    <version>0.2.0</version>
+    <version>0.2.1</version>
 </dependency>
 ```
 
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index e5b8fa9ea..bde3e8b3e 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -36,6 +36,7 @@ kotlin {
             target("watchosArm32")
             target("watchosArm64")
             target("watchosX86")
+            target("watchosX64")
             target("tvosArm64")
             target("tvosX64")
         }
diff --git a/gradle.properties b/gradle.properties
index c8230af1d..d53346736 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,10 +1,10 @@
 org.gradle.jvmargs=-Xmx1G -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
 
 group=org.jetbrains.kotlinx
-version=0.2.0
+version=0.2.1
 versionSuffix=SNAPSHOT
 
-serializationVersion=1.1.0
+serializationVersion=1.2.1
 
 kotlin.mpp.enableGranularSourceSetsMetadata=true
 kotlin.mpp.enableCompatibilityMetadataVariant=true
diff --git a/serialization/build.gradle.kts b/serialization/build.gradle.kts
index 432f00a8a..b2949a42d 100644
--- a/serialization/build.gradle.kts
+++ b/serialization/build.gradle.kts
@@ -19,6 +19,7 @@ kotlin {
         target("watchosArm32")
         target("watchosArm64")
         target("watchosX86")
+        target("watchosX64")
         target("tvosArm64")
         target("tvosX64")
     }