diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18a56a394..3857ec131 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 22.8.1
+### Features Added
+- Updated internal Teku libraries to 22.8.1. This update includes Bellatrix network upgrade and merge transition configuration for Mainnet.
+
 ## 22.8.0
 ### Features Added
 - Added health check endpoint [#538](https://github.com/ConsenSys/web3signer/issues/538). 
diff --git a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/eth2/ValidatorRegistration.java b/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/eth2/ValidatorRegistration.java
index 75f3c1572..6659b535c 100644
--- a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/eth2/ValidatorRegistration.java
+++ b/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/eth2/ValidatorRegistration.java
@@ -58,9 +58,9 @@ public BLSPubKey getPubkey() {
     return pubkey;
   }
 
-  public tech.pegasys.teku.spec.datastructures.execution.ValidatorRegistration
+  public tech.pegasys.teku.spec.datastructures.builder.ValidatorRegistration
       asInternalValidatorRegistration() {
-    return new tech.pegasys.teku.spec.datastructures.execution.ValidatorRegistrationSchema()
+    return new tech.pegasys.teku.spec.datastructures.builder.ValidatorRegistrationSchema()
         .create(feeRecipient, gasLimit, timestamp, pubkey.asBLSPublicKey());
   }
 }
diff --git a/gradle/versions.gradle b/gradle/versions.gradle
index e6d60f809..91e5962a0 100644
--- a/gradle/versions.gradle
+++ b/gradle/versions.gradle
@@ -84,7 +84,7 @@ dependencyManagement {
     dependency 'org.hyperledger.besu:plugin-api:22.4.1'
     dependency 'org.hyperledger.besu.internal:metrics-core:22.4.4'
 
-    dependencySet(group: 'tech.pegasys.teku.internal', version: '22.8.0') {
+    dependencySet(group: 'tech.pegasys.teku.internal', version: '22.8.1') {
       entry 'bls'
       entry 'spec'
       entry 'serializer'