diff --git a/common/src/main/java/bisq/common/crypto/KeyRing.java b/common/src/main/java/bisq/common/crypto/KeyRing.java
index 7f965d702a..df457dcb8d 100644
--- a/common/src/main/java/bisq/common/crypto/KeyRing.java
+++ b/common/src/main/java/bisq/common/crypto/KeyRing.java
@@ -36,7 +36,7 @@ import javax.annotation.Nullable;
 @EqualsAndHashCode
 @Slf4j
 @Singleton
-public class KeyRing {
+public final class KeyRing {
     private final KeyPair signatureKeyPair;
     private final KeyPair encryptionKeyPair;
     private final PubKeyRing pubKeyRing;
diff --git a/common/src/main/java/bisq/common/crypto/PubKeyRing.java b/common/src/main/java/bisq/common/crypto/PubKeyRing.java
index b7fbbb3d09..526d9f1097 100644
--- a/common/src/main/java/bisq/common/crypto/PubKeyRing.java
+++ b/common/src/main/java/bisq/common/crypto/PubKeyRing.java
@@ -42,7 +42,7 @@ import javax.annotation.Nullable;
 @Slf4j
 @EqualsAndHashCode
 @Getter
-public class PubKeyRing implements NetworkPayload, UsedForTradeContractJson {
+public final class PubKeyRing implements NetworkPayload, UsedForTradeContractJson {
     private final byte[] signaturePubKeyBytes;
     private final byte[] encryptionPubKeyBytes;
     @Nullable