diff --git a/redisson/src/main/java/org/redisson/codec/Kryo5Codec.java b/redisson/src/main/java/org/redisson/codec/Kryo5Codec.java
index f9213325f..1d17402b1 100644
--- a/redisson/src/main/java/org/redisson/codec/Kryo5Codec.java
+++ b/redisson/src/main/java/org/redisson/codec/Kryo5Codec.java
@@ -51,7 +51,7 @@ import static com.esotericsoftware.kryo.util.Util.className;
  */
 public class Kryo5Codec extends BaseCodec {
 
-    private static class SimpleInstantiatorStrategy implements org.objenesis.strategy.InstantiatorStrategy {
+    private static final class SimpleInstantiatorStrategy implements org.objenesis.strategy.InstantiatorStrategy {
 
         private final StdInstantiatorStrategy ss = new StdInstantiatorStrategy();
 
diff --git a/redisson/src/main/java/org/redisson/codec/ProtobufCodec.java b/redisson/src/main/java/org/redisson/codec/ProtobufCodec.java
index e2e583949..b8e6b5014 100644
--- a/redisson/src/main/java/org/redisson/codec/ProtobufCodec.java
+++ b/redisson/src/main/java/org/redisson/codec/ProtobufCodec.java
@@ -183,7 +183,7 @@ public class ProtobufCodec extends BaseCodec {
         };
     }
 
-    private static class ProtostuffUtils {
+    private static final class ProtostuffUtils {
 
         @SuppressWarnings("unchecked")
         public static <T> byte[] serialize(T obj) {