diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77f4f57..779db05 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changelog
 Changelog for FrostFS Contract
 
+
 ## [Unreleased]
 
 ### Added
@@ -9,6 +10,21 @@ Changelog for FrostFS Contract
 ### Updated
 ### Fixed
 
+## [0.21.0]
+
+### Added
+- Mention domain name in error messages in the nns contract (#92)
+- Emit DeleteRecord event on record deletion in the nns contract (#114)
+
+### Changed
+- Allow to register TLD automatically (#114)
+- Use frostfsid claims as a permission to create TLD (#115)
+- Ensure subject keys are unique (#118, #129)
+
+### Fixed
+- Terminate session in `ReadIteratorItems()` (#85)
+- Declare `nns.getAllRecords` as safe (#131)
+
 ## [0.20.0]
 
 ### Added
diff --git a/VERSION b/VERSION
index 1847373..759e855 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v0.20.0
+v0.21.0
diff --git a/common/version.go b/common/version.go
index b177416..d599646 100644
--- a/common/version.go
+++ b/common/version.go
@@ -4,15 +4,15 @@ import "github.com/nspcc-dev/neo-go/pkg/interop/native/std"
 
 const (
 	major = 0
-	minor = 20
+	minor = 21
 	patch = 0
 
 	// Versions from which an update should be performed.
 	// These should be used in a group (so prevMinor can be equal to minor if there are
 	// any migration routines.
 	prevMajor = 0
-	prevMinor = 19
-	prevPatch = 3
+	prevMinor = 20
+	prevPatch = 0
 
 	Version = major*1_000_000 + minor*1_000 + patch
 
diff --git a/container/config.yml b/container/config.yml
index c040d12..9778ed3 100644
--- a/container/config.yml
+++ b/container/config.yml
@@ -29,7 +29,7 @@ events:
   - name: DeleteSuccess
     parameters:
       - name: containerID
-        type: ByteArray
+        type: Hash256
   - name: SetEACLSuccess
     parameters:
       - name: containerID
diff --git a/container/container_contract.go b/container/container_contract.go
index 7946923..c6b0420 100644
--- a/container/container_contract.go
+++ b/container/container_contract.go
@@ -279,7 +279,7 @@ func checkNiceNameAvailable(nnsContractAddr interop.Hash160, domain string) bool
 // API.
 //
 // If the container doesn't exist, it panics with NotFoundError.
-func Delete(containerID []byte, signature interop.Signature, publicKey interop.PublicKey, token []byte) {
+func Delete(containerID interop.Hash256, signature interop.Signature, publicKey interop.PublicKey, token []byte) {
 	ctx := storage.GetContext()
 
 	ownerID := getOwnerByID(ctx, containerID)
diff --git a/rpcclient/container/client.go b/rpcclient/container/client.go
index 4780ca5..216a912 100644
--- a/rpcclient/container/client.go
+++ b/rpcclient/container/client.go
@@ -25,7 +25,7 @@ type PutSuccessEvent struct {
 
 // DeleteSuccessEvent represents "DeleteSuccess" event emitted by the contract.
 type DeleteSuccessEvent struct {
-	ContainerID []byte
+	ContainerID util.Uint256
 }
 
 // SetEACLSuccessEvent represents "SetEACLSuccess" event emitted by the contract.
@@ -163,14 +163,14 @@ func (c *ContractReader) Version() (*big.Int, error) {
 // Delete creates a transaction invoking `delete` method of the contract.
 // This transaction is signed and immediately sent to the network.
 // The values returned are its hash, ValidUntilBlock value and error if any.
-func (c *Contract) Delete(containerID []byte, signature []byte, publicKey *keys.PublicKey, token []byte) (util.Uint256, uint32, error) {
+func (c *Contract) Delete(containerID util.Uint256, signature []byte, publicKey *keys.PublicKey, token []byte) (util.Uint256, uint32, error) {
 	return c.actor.SendCall(c.hash, "delete", containerID, signature, publicKey, token)
 }
 
 // DeleteTransaction creates a transaction invoking `delete` method of the contract.
 // This transaction is signed, but not sent to the network, instead it's
 // returned to the caller.
-func (c *Contract) DeleteTransaction(containerID []byte, signature []byte, publicKey *keys.PublicKey, token []byte) (*transaction.Transaction, error) {
+func (c *Contract) DeleteTransaction(containerID util.Uint256, signature []byte, publicKey *keys.PublicKey, token []byte) (*transaction.Transaction, error) {
 	return c.actor.MakeCall(c.hash, "delete", containerID, signature, publicKey, token)
 }
 
@@ -178,7 +178,7 @@ func (c *Contract) DeleteTransaction(containerID []byte, signature []byte, publi
 // This transaction is not signed, it's simply returned to the caller.
 // Any fields of it that do not affect fees can be changed (ValidUntilBlock,
 // Nonce), fee values (NetworkFee, SystemFee) can be increased as well.
-func (c *Contract) DeleteUnsigned(containerID []byte, signature []byte, publicKey *keys.PublicKey, token []byte) (*transaction.Transaction, error) {
+func (c *Contract) DeleteUnsigned(containerID util.Uint256, signature []byte, publicKey *keys.PublicKey, token []byte) (*transaction.Transaction, error) {
 	return c.actor.MakeUnsignedCall(c.hash, "delete", nil, containerID, signature, publicKey, token)
 }
 
@@ -480,7 +480,17 @@ func (e *DeleteSuccessEvent) FromStackItem(item *stackitem.Array) error {
 		err   error
 	)
 	index++
-	e.ContainerID, err = arr[index].TryBytes()
+	e.ContainerID, err = func(item stackitem.Item) (util.Uint256, error) {
+		b, err := item.TryBytes()
+		if err != nil {
+			return util.Uint256{}, err
+		}
+		u, err := util.Uint256DecodeBytesBE(b)
+		if err != nil {
+			return util.Uint256{}, err
+		}
+		return u, nil
+	}(arr[index])
 	if err != nil {
 		return fmt.Errorf("field ContainerID: %w", err)
 	}