diff --git a/ChangeLog.md b/ChangeLog.md
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--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,113 @@
 # CHANGELOG
 
+## 1.6.0-RC
+
+### Compiler
+
+#### Fixes
+
+- [`KT-49157`](https://youtrack.jetbrains.com/issue/KT-49157) Tail-call optimization miss with cast to type parameter
+- [`KT-48778`](https://youtrack.jetbrains.com/issue/KT-48778) -Xtype-enhancement-improvements-strict-mode not respecting @NonNull annotation for property accesses?
+- [`KT-46437`](https://youtrack.jetbrains.com/issue/KT-46437) NI: "Throwable: Resolution error of this type shouldn't occur for resolve if as a call" caused by reflectively accessing private property inside "if/else" or "when" expression
+- [`KT-48590`](https://youtrack.jetbrains.com/issue/KT-48590) IllegalArgumentException: ClassicTypeSystemContext couldn't handle: Captured(*) reified type class reference
+- [`KT-48261`](https://youtrack.jetbrains.com/issue/KT-48261) "overload resolution ambiguity" for JSpecify+jsr305-annotated Java List implementation
+- [`KT-48633`](https://youtrack.jetbrains.com/issue/KT-48633) Can't infer builder inference's type argument across local class
+- [`KT-49136`](https://youtrack.jetbrains.com/issue/KT-49136) JVM IR: NPE with safe call chain and property set to null by reflection
+- [`KT-48912`](https://youtrack.jetbrains.com/issue/KT-48912) K/N `Symbol with IrSimpleFunctionSymbolImpl is unbound` and `JS Validation failed in file shaders.kt`
+- [`KT-48928`](https://youtrack.jetbrains.com/issue/KT-48928) Prohibit using old JVM backend with language version >= 1.6
+- [`KT-41978`](https://youtrack.jetbrains.com/issue/KT-41978) NI: Kotlin fails  to infer type of function argument
+- [`KT-48732`](https://youtrack.jetbrains.com/issue/KT-48732) JVM / IR: MalformedParameterizedTypeException is thrown when a Spring Bean of suspending function type is registered
+- [`KT-47841`](https://youtrack.jetbrains.com/issue/KT-47841) Turning LV to 1.6 breaks some diagnostics based on jspecify annotations
+- [`KT-48498`](https://youtrack.jetbrains.com/issue/KT-48498) JVM IR: IllegalAccessError with inline function call and property delegation from different module
+- [`KT-48319`](https://youtrack.jetbrains.com/issue/KT-48319) JVM / IR: AssertionError: FUN caused by suspend lambda inside anonymous function
+- [`KT-48835`](https://youtrack.jetbrains.com/issue/KT-48835) Psi2ir: vararg parameter value is lost when translating adapted function reference to base class member
+- [`KT-46908`](https://youtrack.jetbrains.com/issue/KT-46908) JVM / IR: do not wrap fun interface implementation into another SAM adapter if it inherits from a functional type
+- [`KT-48927`](https://youtrack.jetbrains.com/issue/KT-48927) JVM IR: "VerifyError: Bad invokespecial instruction: current class isn't assignable to reference class" when up-casting and read a base class's private property that has a custom getter in the base class's public function
+- [`KT-48992`](https://youtrack.jetbrains.com/issue/KT-48992) Postpone migration to new operator resolution scheme for integer literals
+- [`KT-48290`](https://youtrack.jetbrains.com/issue/KT-48290) Type bounds warning based on Java annotations not issues with language level 1.6
+- [`KT-47920`](https://youtrack.jetbrains.com/issue/KT-47920) There is no warning on violated nullability of type parameter in accordance with java nullability annotation
+- [`KT-48851`](https://youtrack.jetbrains.com/issue/KT-48851) Keep using warn mode for jspecify in 1.6
+- [`KT-46829`](https://youtrack.jetbrains.com/issue/KT-46829) IR: NullPointerException caused by setting scoped generic extension var
+- [`KT-44843`](https://youtrack.jetbrains.com/issue/KT-44843) PSI2IR: "org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression" with delegate who has name or parameter with the same name as a property
+- [`KT-42972`](https://youtrack.jetbrains.com/issue/KT-42972) Forbid protected constructor calls from public inline functions
+- [`KT-45378`](https://youtrack.jetbrains.com/issue/KT-45378) Prohibit super calls in public-api inline functions
+- [`KT-48515`](https://youtrack.jetbrains.com/issue/KT-48515) JSpecify: If a class has a @Nullable type-parameter bound, Kotlin should still treat unbounded wildcards like platform types
+- [`KT-48825`](https://youtrack.jetbrains.com/issue/KT-48825) JVM IR: NPE with delegated property "by this" to base class
+- [`KT-48535`](https://youtrack.jetbrains.com/issue/KT-48535) Make EXPERIMENTAL_ANNOTATION_ON_OVERRIDE warning
+- [`KT-48478`](https://youtrack.jetbrains.com/issue/KT-48478) JVM IR: Coroutines 1.5.1 + Kotlin 1.5.30 - ClassCastException: CompletedContinuation cannot be cast to DispatchedContinuation
+- [`KT-48671`](https://youtrack.jetbrains.com/issue/KT-48671) JVM / IR: "AssertionError: Primitive array expected: CLASS IR_EXTERNAL_DECLARATION_STUB CLASS"
+- [`KT-46181`](https://youtrack.jetbrains.com/issue/KT-46181) JVM IR: private @JvmStatic function is generated in the outer class instead of companion object, which breaks existing calls via JNI or reflection (e.g. JUnit @MethodSource)
+- [`KT-48736`](https://youtrack.jetbrains.com/issue/KT-48736) JVM IR: assert in SyntheticAccessorLowering when inline function attempts to access package-private field from Java
+- [`KT-20542`](https://youtrack.jetbrains.com/issue/KT-20542) IllegalAccessError on calling private function with default parameters from internal inline function used in another package
+- [`KT-48331`](https://youtrack.jetbrains.com/issue/KT-48331) JVM / IR: "VerifyError: Bad access to protected data in invokevirtual" when a sealed class uses another sealed class in its same hierarchy level as a constructor parameter
+- [`KT-48659`](https://youtrack.jetbrains.com/issue/KT-48659) JVM / IR: Referential equality returns true for different instances
+- [`KT-48606`](https://youtrack.jetbrains.com/issue/KT-48606) [1.6] Instantiated annotations do not implement hashCode correctly/consistently
+- [`KT-48316`](https://youtrack.jetbrains.com/issue/KT-48316) "No value passed for parameter" regression with Java annotation default values with JSR-305
+- [`KT-48391`](https://youtrack.jetbrains.com/issue/KT-48391) JVM / IR: "AssertionError: SyntheticAccessorLowering should not attempt to modify other files!" caused by class which inherits interface which has default function with default argument from companion const val
+
+### IDE. Gradle Integration
+
+- [`KT-46273`](https://youtrack.jetbrains.com/issue/KT-46273) MPP: Don't fail import for case of missed platform in source set structure
+- [`KT-48823`](https://youtrack.jetbrains.com/issue/KT-48823) Improve error reporting on import when configuration phase in Gradle failed
+- [`KT-48504`](https://youtrack.jetbrains.com/issue/KT-48504) MPP: UninitializedPropertyAccessException on import if new hierarchical mpp flag conflicts with other flags
+
+### Libraries
+
+#### New Features
+
+- [`KT-46423`](https://youtrack.jetbrains.com/issue/KT-46423) infix extension fun Comparable<T>.compareTo
+- [`KT-47421`](https://youtrack.jetbrains.com/issue/KT-47421) Stabilize collection builders
+
+#### Performance Improvements
+
+- [`KT-45438`](https://youtrack.jetbrains.com/issue/KT-45438) Remove brittle ?contains? optimization in minus/removeAll/retainAll
+
+#### Fixes
+
+- [`KT-47304`](https://youtrack.jetbrains.com/issue/KT-47304) Random#nextLong generates value outside provided range
+- [`KT-48999`](https://youtrack.jetbrains.com/issue/KT-48999) Align behavior of some JS functions with their JVM counterpart
+- [`KT-28378`](https://youtrack.jetbrains.com/issue/KT-28378) Different behavior of Regex replace function in Java and JS when replacement string contains group reference
+- [`KT-46229`](https://youtrack.jetbrains.com/issue/KT-46229) Bring back Duration factory extension properties
+- [`KT-46243`](https://youtrack.jetbrains.com/issue/KT-46243) Typography.leftGuillemete and Typography.rightGuillemete are named inconsistent with standard
+- [`KT-46101`](https://youtrack.jetbrains.com/issue/KT-46101) Review deprecations in stdlib for 1.6
+- [`KT-48456`](https://youtrack.jetbrains.com/issue/KT-48456) Introduce Common (multi-platform) readln() and readlnOrNull() top-level functions
+- [`KT-38754`](https://youtrack.jetbrains.com/issue/KT-38754) Deprecate appendln in favor of appendLine
+
+### Native
+
+- [`KT-48807`](https://youtrack.jetbrains.com/issue/KT-48807) Cinterop: cannot create bindings for a framework when Xcode 13 RC is installed
+
+### Tools. CLI
+
+- [`KT-49007`](https://youtrack.jetbrains.com/issue/KT-49007) Support three previous API versions
+
+### Tools. Compiler Plugins
+
+- [`KT-48842`](https://youtrack.jetbrains.com/issue/KT-48842) Compiler crash: Symbol with IrFieldSymbolImpl is unbound
+- [`KT-48117`](https://youtrack.jetbrains.com/issue/KT-48117) Kotlin AllOpen Plugin should open private methods
+
+### Tools. Gradle
+
+- [`KT-48745`](https://youtrack.jetbrains.com/issue/KT-48745) JVM target compatibility check should be disabled when Java sources are empty
+- [`KT-49066`](https://youtrack.jetbrains.com/issue/KT-49066) Setting kotlinOptions.modulePath in an android project breaks incremental compilation
+- [`KT-48847`](https://youtrack.jetbrains.com/issue/KT-48847) Remove deprecated kotlin options marked for removal after 1.5
+- [`KT-48245`](https://youtrack.jetbrains.com/issue/KT-48245) KGP makes compileOnly configuration resolvable
+- [`KT-48768`](https://youtrack.jetbrains.com/issue/KT-48768) Misleading 'jdkHome' deprecation message
+
+### Tools. Gradle. Multiplatform
+
+- [`KT-48919`](https://youtrack.jetbrains.com/issue/KT-48919) Gradle multiplatform plugin 1.6.0-M1 does not accept apiVersion = "1.7"
+
+### Tools. Scripts
+
+- [`KT-49012`](https://youtrack.jetbrains.com/issue/KT-49012) Compiling .kts script with inner class declaration fails with Backend Internal Error caused by AE: "Local class constructor can't have dispatch receiver"
+
+### Tools. kapt
+
+- [`KT-45545`](https://youtrack.jetbrains.com/issue/KT-45545) Kapt is not compatible with JDK 16+
+- [`KT-47934`](https://youtrack.jetbrains.com/issue/KT-47934) KaptJavaLog is unable to map stub back to the kotlin source
+
+
 ## 1.5.21
 
 ### Compiler