diff --git a/CHANGELOG.md b/CHANGELOG.md
index 636067bf4..84b00b442 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 12.1.0
+
+- Added deserialization for the `ConfigureDelegation` payload
+- Fixed incorrect deserialization of the `UpdateContract` payload parameter
+
 ## 12.0.0
 
 - Support for Protocol 10
diff --git a/concordium-android-sdk/pom.xml b/concordium-android-sdk/pom.xml
index c07fa23ed..24351a1a9 100644
--- a/concordium-android-sdk/pom.xml
+++ b/concordium-android-sdk/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.concordium.sdk</groupId>
         <artifactId>concordium-sdk-base</artifactId>
-        <version>12.0.0</version>
+        <version>12.1.0-alpha.1</version>
     </parent>
 
     <artifactId>concordium-android-sdk</artifactId>
diff --git a/concordium-sdk/pom.xml b/concordium-sdk/pom.xml
index 4568a23b3..e41d807ec 100644
--- a/concordium-sdk/pom.xml
+++ b/concordium-sdk/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.concordium.sdk</groupId>
         <artifactId>concordium-sdk-base</artifactId>
-        <version>12.0.0</version>
+        <version>12.1.0-alpha.1</version>
     </parent>
 
     <artifactId>concordium-sdk</artifactId>
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/responses/transactionstatus/DelegationTarget.java b/concordium-sdk/src/main/java/com/concordium/sdk/responses/transactionstatus/DelegationTarget.java
index f3f90d8de..35477513b 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/responses/transactionstatus/DelegationTarget.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/responses/transactionstatus/DelegationTarget.java
@@ -1,8 +1,6 @@
 package com.concordium.sdk.responses.transactionstatus;
 
 import com.concordium.sdk.responses.BakerId;
-import com.concordium.sdk.transactions.TransactionType;
-import com.concordium.sdk.types.UInt16;
 import com.concordium.sdk.types.UInt64;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import lombok.*;
@@ -62,6 +60,18 @@ public byte[] getBytes() {
         throw new IllegalArgumentException("Illegal DelegationType. Must be either PASSIVE or BAKER");
     }
 
+    public static DelegationTarget fromBytes(ByteBuffer source) {
+        val tag = source.get();
+        switch (tag) {
+            case 0:
+                return newPassiveDelegationTarget();
+            case 1:
+                return newBakerDelegationTarget(BakerId.from(UInt64.fromBytes(source).getValue()));
+            default:
+                throw new IllegalArgumentException("Unrecognized delegation target type");
+        }
+    }
+
     @ToString
     public enum DelegationType {
         /**
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/ConfigureDelegation.java b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/ConfigureDelegation.java
index fd0373e16..78226ec22 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/ConfigureDelegation.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/ConfigureDelegation.java
@@ -2,7 +2,10 @@
 
 import com.concordium.sdk.responses.transactionstatus.DelegationTarget;
 import com.concordium.sdk.types.UInt16;
-import lombok.*;
+import lombok.Builder;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.val;
 
 import javax.annotation.Nullable;
 import java.nio.ByteBuffer;
@@ -104,4 +107,17 @@ protected byte[] getPayloadBytes() {
 
         return buffer.array();
     }
+
+    public static ConfigureDelegation fromBytes(ByteBuffer source) {
+        int bitmap = UInt16.fromBytes(source).getValue();
+        boolean hasCapital = (bitmap & 1) != 0;
+        boolean hasRestakeEarnings = (bitmap & (1 << 1)) != 0;
+        boolean hasDelegationTarget = (bitmap & (1 << 2)) != 0;
+
+        return new ConfigureDelegation(
+                (hasCapital) ? CCDAmount.fromBytes(source) : null,
+                (hasRestakeEarnings) ? source.get() != 0 : null,
+                (hasDelegationTarget) ? DelegationTarget.fromBytes(source) : null
+        );
+    }
 }
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Parameter.java b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Parameter.java
index 98699b80c..8c9f7f7bc 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Parameter.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Parameter.java
@@ -74,4 +74,11 @@ public byte[] getBytesForContractInvocation() {
      * @return converted {@link Parameter}.
      */
     public static Parameter from(SchemaParameter param)  {return from(param.toBytes());}
+
+    public static Parameter fromBytes(ByteBuffer source) {
+        val length = UInt16.fromBytes(source);
+        val bytes = new byte[length.getValue()];
+        source.get(bytes);
+        return new Parameter(bytes);
+    }
 }
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Payload.java b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Payload.java
index c54818a2d..15fdd551f 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Payload.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/Payload.java
@@ -63,6 +63,8 @@ public static Payload fromBytes(ByteBuffer source) {
                 return RegisterData.fromBytes(source);
             case TRANSFER_WITH_MEMO:
                 return TransferWithMemo.fromBytes(source);
+            case CONFIGURE_DELEGATION:
+                return ConfigureDelegation.fromBytes(source);
             case TOKEN_UPDATE:
                 return TokenUpdate.fromBytes(source);
             default:
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/UpdateContract.java b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/UpdateContract.java
index 1cfc040dd..07266e455 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/transactions/UpdateContract.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/transactions/UpdateContract.java
@@ -135,8 +135,7 @@ public static Payload fromBytes(ByteBuffer source) {
         val amount = CCDAmount.fromBytes(source);
         val contractAddress = ContractAddress.from(source);
         val receiveName = ReceiveName.from(source);
-        byte[] parameterBuffer = new byte[source.remaining()];
-        source.get(parameterBuffer);
-        return UpdateContract.from(amount, contractAddress, receiveName, Parameter.from(parameterBuffer));
+        val parameter = Parameter.fromBytes(source);
+        return UpdateContract.from(amount, contractAddress, receiveName, parameter);
     }
 }
diff --git a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/ConfigureDelegationTest.java b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/ConfigureDelegationTest.java
index f28e2691a..16cee27fb 100644
--- a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/ConfigureDelegationTest.java
+++ b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/ConfigureDelegationTest.java
@@ -9,6 +9,8 @@
 import org.apache.commons.codec.binary.Hex;
 import org.junit.Test;
 
+import java.nio.ByteBuffer;
+
 import static org.junit.Assert.assertEquals;
 
 public class ConfigureDelegationTest {
@@ -34,7 +36,7 @@ public void shouldConfigureDelegationTransaction() {
         assertEquals(212, transaction.getVersionedBytes().length);
     }
 
-
+    @SneakyThrows
     @Test
     public void serializeConfigurePassivePoolNoRestake() {
         val payload = ConfigureDelegation
@@ -43,9 +45,12 @@ public void serializeConfigurePassivePoolNoRestake() {
                 .capital(CCDAmount.from(100))
                 .restakeEarnings(false)
                 .build();
-        assertEquals("1a00070000000005f5e1000000", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a00070000000005f5e1000000";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeConfigurePassivePoolRestake() {
         val payload = ConfigureDelegation
@@ -54,9 +59,12 @@ public void serializeConfigurePassivePoolRestake() {
                 .capital(CCDAmount.from(100))
                 .restakeEarnings(true)
                 .build();
-        assertEquals("1a00070000000005f5e1000100", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a00070000000005f5e1000100";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeConfigureBakerPoolNoRestake() {
         val payload = ConfigureDelegation
@@ -65,9 +73,12 @@ public void serializeConfigureBakerPoolNoRestake() {
                 .restakeEarnings(false)
                 .capital(CCDAmount.from(100))
                 .build();
-        assertEquals("1a00070000000005f5e100000100000000000004d2", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a00070000000005f5e100000100000000000004d2";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeConfigureBakerPoolRestake() {
         val payload = ConfigureDelegation
@@ -76,34 +87,44 @@ public void serializeConfigureBakerPoolRestake() {
                 .capital(CCDAmount.from(100))
                 .restakeEarnings(true)
                 .build();
-        assertEquals("1a00070000000005f5e100010100000000000004d2", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a00070000000005f5e100010100000000000004d2";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeDeregisterPayload() {
         val payload = ConfigureDelegation
                 .builder()
                 .capital(CCDAmount.from(0))
                 .build();
-        assertEquals("1a00010000000000000000", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a00010000000000000000";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeStopRestake() {
         val payload = ConfigureDelegation
                 .builder()
                 .restakeEarnings(false)
                 .build();
-        assertEquals("1a000200", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a000200";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
 
+    @SneakyThrows
     @Test
     public void serializeEnableRestake() {
         val payload = ConfigureDelegation
                 .builder()
                 .restakeEarnings(true)
                 .build();
-        assertEquals("1a000201", Hex.encodeHexString(payload.getBytes()));
+        val expectedHex = "1a000201";
+        assertEquals(expectedHex, Hex.encodeHexString(payload.getBytes()));
+        assertEquals(payload, Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex))));
     }
-
 }
diff --git a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/TransactionSerializationTest.java b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/TransactionSerializationTest.java
index a9f63df75..7fdea3a77 100644
--- a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/TransactionSerializationTest.java
+++ b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/TransactionSerializationTest.java
@@ -8,11 +8,9 @@
 import com.concordium.sdk.types.AccountAddress;
 import com.concordium.sdk.types.ContractAddress;
 import com.concordium.sdk.types.Nonce;
-import com.concordium.sdk.types.UInt16;
 import com.google.common.collect.Lists;
 import lombok.SneakyThrows;
 import org.apache.commons.codec.binary.Hex;
-import org.bouncycastle.util.Arrays;
 import org.junit.Test;
 
 import java.nio.ByteBuffer;
@@ -113,7 +111,7 @@ public void testDeserializeContractUpdate() {
         Cis2Transfer expectedParameters = new Cis2Transfer(TokenId.from(new byte[0]), TokenAmount.from(11078313), AccountAddress.from("49NGYqmPtbuCkXSQt7298mL6Xp52UpSR4U2jVzJjKW9P3b3whw"), AccountAddress.from("4sGtbuGKgakv5pKSMsy3CEQbW3sn2PbTzTVLZLA6zxX5bB3C5a"), null);
         byte[] expectedParams = updateContract.getParam().getBytes();
         byte[] cis2TransferParams = SerializationUtils.serializeTransfers(Lists.newArrayList(expectedParameters)).getBytes();
-        assertArrayEquals(expectedParams, Arrays.concatenate(UInt16.from(cis2TransferParams.length).getBytes(), cis2TransferParams));
+        assertArrayEquals(expectedParams, cis2TransferParams);
     }
 
 
diff --git a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/UpdateContractTest.java b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/UpdateContractTest.java
index 514dfbea8..8fca9cb5a 100644
--- a/concordium-sdk/src/test/java/com/concordium/sdk/transactions/UpdateContractTest.java
+++ b/concordium-sdk/src/test/java/com/concordium/sdk/transactions/UpdateContractTest.java
@@ -10,6 +10,8 @@
 import org.apache.commons.codec.binary.Hex;
 import org.junit.Test;
 
+import java.nio.ByteBuffer;
+
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 
@@ -25,7 +27,7 @@ public void updateContractTest() {
         byte[] emptyArray = new byte[0];
         UpdateContract updateContractPayload = UpdateContract.from(0, ContractAddress.from(81, 0), "CIS2-NFT", "mint", emptyArray);
         AccountTransaction tx = TransactionFactory
-                .newUpdateContract(updateContractPayload,UInt64.from(3000))
+                .newUpdateContract(updateContractPayload, UInt64.from(3000))
                 .sender(AccountAddress.from("3JwD2Wm3nMbsowCwb1iGEpnt47UQgdrtnq2qT6opJc3z2AgCrc"))
                 .nonce(Nonce.from(78910))
                 .expiry(Expiry.from(123456))
@@ -51,4 +53,25 @@ public void updateContractTest() {
         val blockItemHash = tx.getHash();
         assertEquals("0a869928f2491d0652a708eac0231582e24c0cc036481f209862147856531d20", blockItemHash.asHex());
     }
+
+    @SneakyThrows
+    @Test
+    public void testUpdateContractPayloadSerialization() {
+        UpdateContract updateContractPayload = UpdateContract.from(
+                1,
+                ContractAddress.from(81, 0),
+                "CIS2-NFT",
+                "mint",
+                new byte[]{1, 2, 3}
+        );
+        val expectedHex = "02000000000000000100000000000000510000000000000000000d434953322d4e46542e6d696e740003010203";
+        assertEquals(
+                expectedHex,
+                Hex.encodeHexString(updateContractPayload.getBytes())
+        );
+        assertEquals(
+                updateContractPayload,
+                Payload.fromBytes(ByteBuffer.wrap(Hex.decodeHex(expectedHex)))
+        );
+    }
 }
diff --git a/pom.xml b/pom.xml
index 446962aaa..6909f722b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>com.concordium.sdk</groupId>
     <artifactId>concordium-sdk-base</artifactId>
-    <version>12.0.0</version>
+    <version>12.1.0-alpha.1</version>
     <packaging>pom</packaging>
 
     <url>https://github.com/Concordium/concordium-java-sdk</url>