diff --git a/redisson/src/main/java/org/redisson/misc/AsyncCountDownLatch.java b/redisson/src/main/java/org/redisson/misc/AsyncCountDownLatch.java
index 98ca6b232..6d6a636ef 100644
--- a/redisson/src/main/java/org/redisson/misc/AsyncCountDownLatch.java
+++ b/redisson/src/main/java/org/redisson/misc/AsyncCountDownLatch.java
@@ -22,7 +22,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  * @author Nikita Koksharov
  *
  */
-public class AsyncCountDownLatch {
+public final class AsyncCountDownLatch {
 
     private final AtomicInteger commandsSent = new AtomicInteger();
     private volatile Runnable callback;
diff --git a/redisson/src/main/java/org/redisson/misc/AsyncSemaphore.java b/redisson/src/main/java/org/redisson/misc/AsyncSemaphore.java
index 0ba4602b7..725d83cb0 100644
--- a/redisson/src/main/java/org/redisson/misc/AsyncSemaphore.java
+++ b/redisson/src/main/java/org/redisson/misc/AsyncSemaphore.java
@@ -25,7 +25,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  * @author Nikita Koksharov
  *
  */
-public class AsyncSemaphore {
+public final class AsyncSemaphore {
 
     private final AtomicInteger counter;
     private final Queue<CompletableFuture<Void>> listeners = new ConcurrentLinkedQueue<>();
diff --git a/redisson/src/main/java/org/redisson/misc/RandomXoshiro256StarStar.java b/redisson/src/main/java/org/redisson/misc/RandomXoshiro256StarStar.java
index accb68880..5c6e9b64c 100644
--- a/redisson/src/main/java/org/redisson/misc/RandomXoshiro256StarStar.java
+++ b/redisson/src/main/java/org/redisson/misc/RandomXoshiro256StarStar.java
@@ -41,7 +41,7 @@ import java.util.concurrent.atomic.AtomicStampedReference;
  * @author Una Thompson &lt;una@unascribed.com> (Java port)
  * @author Nikita Koksharov
  */
-public class RandomXoshiro256StarStar extends Random {
+public final class RandomXoshiro256StarStar extends Random {
 
     private static final long serialVersionUID = -2837799889588687855L;
 
diff --git a/redisson/src/main/java/org/redisson/misc/RedisURI.java b/redisson/src/main/java/org/redisson/misc/RedisURI.java
index 6d8a66bd5..94ff3271b 100644
--- a/redisson/src/main/java/org/redisson/misc/RedisURI.java
+++ b/redisson/src/main/java/org/redisson/misc/RedisURI.java
@@ -27,7 +27,7 @@ import java.util.Objects;
  * @author Nikita Koksharov
  *
  */
-public class RedisURI {
+public final class RedisURI {
 
     private final boolean ssl;
     private final String host;