diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90963226..ec7b69e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # CHANGELOG
 
+## 0.5.4
+> Published 17 September 2024
+
+### Features
+- Extended Unsafe API with a function allowing to iterate over all Buffer's segments [#383](https://github.com/Kotlin/kotlinx-io/pull/383)
+- Implemented `ByteString` conversion to/from `NSData` on Apple platforms [#384](https://github.com/Kotlin/kotlinx-io/pull/384)
+- Implemented extensions to read/write `ByteString` from to/from `ByteBuffer`, as well as representing
+  `ByteString` as a read-only `ByteBuffer` on JVM [#387](https://github.com/Kotlin/kotlinx-io/pull/387)
+- Implemented `ByteString` factory accepting unsigned bytes [#390](https://github.com/Kotlin/kotlinx-io/pull/390)
+- Reimplemented various functions using Unsafe API [#337](https://github.com/Kotlin/kotlinx-io/pull/337)
+- Minor documentation improvements
+
 ## 0.5.3
 > Published 19 August 2024
 
diff --git a/README.md b/README.md
index da2368c4..bca1c2c7 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ repositories {
 Add the library to dependencies:
 ```kotlin
 dependencies {
-    implementation("org.jetbrains.kotlinx:kotlinx-io-core:0.5.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-io-core:0.5.4")
 }
 ```
 
@@ -58,7 +58,7 @@ kotlin {
     sourceSets {
         commonMain {
             dependencies {
-                implementation("org.jetbrains.kotlinx:kotlinx-io-core:0.5.3")
+                implementation("org.jetbrains.kotlinx:kotlinx-io-core:0.5.4")
             }
         }
     }
@@ -72,7 +72,7 @@ Add the library to dependencies:
 <dependency>
     <groupId>org.jetbrains.kotlinx</groupId>
     <artifactId>kotlinx-io-core-jvm</artifactId>
-    <version>0.5.3</version>
+    <version>0.5.4</version>
 </dependency>
 ```