diff --git a/pom.xml b/pom.xml
index 182132f7a0..c1cd2d98c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -256,7 +256,6 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-resolver-dns</artifactId>
-            <optional>true</optional>
         </dependency>
 
         <dependency>
diff --git a/src/main/java/io/lettuce/core/resource/AddressResolverGroupProvider.java b/src/main/java/io/lettuce/core/resource/AddressResolverGroupProvider.java
index effa2e5051..2aba88d2b4 100644
--- a/src/main/java/io/lettuce/core/resource/AddressResolverGroupProvider.java
+++ b/src/main/java/io/lettuce/core/resource/AddressResolverGroupProvider.java
@@ -1,6 +1,5 @@
 package io.lettuce.core.resource;
 
-import io.lettuce.core.internal.LettuceClassUtils;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.resolver.AddressResolverGroup;
 import io.netty.resolver.DefaultAddressResolverGroup;
@@ -8,37 +7,23 @@
 import io.netty.resolver.dns.DefaultDnsCnameCache;
 import io.netty.resolver.dns.DnsAddressResolverGroup;
 import io.netty.resolver.dns.DnsNameResolverBuilder;
-import io.netty.util.internal.logging.InternalLogger;
-import io.netty.util.internal.logging.InternalLoggerFactory;
 
 /**
  * Wraps and provides {@link AddressResolverGroup} classes. This is to protect the user from {@link ClassNotFoundException}'s
  * caused by the absence of the {@literal netty-dns-resolver} library during runtime. This class will be deleted when
  * {@literal netty-dns-resolver} becomes mandatory. Internal API.
+ * <p>
+ * Since Lettuce 6.7, {@literal netty-dns-resolver} became a required dependency so this class now unconditionally uses
+ * {@link DnsAddressResolverGroup}
  *
  * @author Yohei Ueki
  * @author Mark Paluch
+ * @author Euiyoung Nam
  * @since 6.1
  */
 class AddressResolverGroupProvider {
 
-    private static final InternalLogger logger = InternalLoggerFactory.getInstance(AddressResolverGroupProvider.class);
-
-    private static final AddressResolverGroup<?> ADDRESS_RESOLVER_GROUP;
-
-    static {
-        boolean dnsResolverAvailable = LettuceClassUtils.isPresent("io.netty.resolver.dns.DnsAddressResolverGroup");
-
-        AddressResolverGroup<?> group;
-        if (dnsResolverAvailable) {
-            logger.debug("Starting with netty's non-blocking DNS resolver library");
-            group = DefaultDnsAddressResolverGroupWrapper.INSTANCE;
-        } else {
-            logger.debug("Starting without optional netty's non-blocking DNS resolver library");
-            group = DefaultAddressResolverGroup.INSTANCE;
-        }
-        ADDRESS_RESOLVER_GROUP = group;
-    }
+    private static final AddressResolverGroup<?> ADDRESS_RESOLVER_GROUP = DefaultDnsAddressResolverGroupWrapper.INSTANCE;
 
     /**
      * Returns the {@link AddressResolverGroup} for DNS resolution.
diff --git a/src/main/java/io/lettuce/core/resource/ClientResources.java b/src/main/java/io/lettuce/core/resource/ClientResources.java
index 4d82d4ac08..e00ddab33a 100644
--- a/src/main/java/io/lettuce/core/resource/ClientResources.java
+++ b/src/main/java/io/lettuce/core/resource/ClientResources.java
@@ -56,6 +56,7 @@
  * @author Mark Paluch
  * @author Mikhael Sokolov
  * @author Yohei Ueki
+ * @author Euiyoung Nam
  * @since 3.4
  * @see DefaultClientResources
  */
@@ -361,7 +362,9 @@ default Builder commandLatencyCollector(CommandLatencyCollector commandLatencyCo
      *
      * @return the DNS resolver.
      * @since 4.3
+     * @deprecated since 6.6 replaced by{@link AddressResolverGroup} instead.
      */
+    @Deprecated
     DnsResolver dnsResolver();
 
     /**
diff --git a/src/main/java/io/lettuce/core/resource/DefaultClientResources.java b/src/main/java/io/lettuce/core/resource/DefaultClientResources.java
index a165978df6..276df31d46 100644
--- a/src/main/java/io/lettuce/core/resource/DefaultClientResources.java
+++ b/src/main/java/io/lettuce/core/resource/DefaultClientResources.java
@@ -79,6 +79,7 @@
  *
  * @author Mark Paluch
  * @author Yohei Ueki
+ * @author Euiyoung Nam
  * @since 3.4
  */
 public class DefaultClientResources implements ClientResources {
@@ -786,6 +787,10 @@ public int computationThreadPoolSize() {
         return LettuceLists.newList(eventExecutorGroup.iterator()).size();
     }
 
+    /**
+     * @deprecated since 6.7 replaced by{@link AddressResolverGroup} instead.
+     **/
+    @Deprecated
     @Override
     public DnsResolver dnsResolver() {
         return dnsResolver;
diff --git a/src/main/java/io/lettuce/core/resource/DnsResolver.java b/src/main/java/io/lettuce/core/resource/DnsResolver.java
index 23863402d5..083e07a8ef 100644
--- a/src/main/java/io/lettuce/core/resource/DnsResolver.java
+++ b/src/main/java/io/lettuce/core/resource/DnsResolver.java
@@ -2,11 +2,13 @@
 
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import io.netty.resolver.AddressResolverGroup;
 
 /**
  * Users may implement this interface to override the normal DNS lookup offered by the OS.
  *
  * @author Mark Paluch
+ * @author Euiyoung Nam
  * @since 4.2
  */
 public interface DnsResolver {
@@ -14,6 +16,7 @@ public interface DnsResolver {
     /**
      * Java VM default resolver.
      *
+     * @deprecated since 6.7, see {@link AddressResolverGroup}
      * @since 5.1
      */
     static DnsResolver jvmDefault() {
diff --git a/src/main/java/io/lettuce/core/resource/DnsResolvers.java b/src/main/java/io/lettuce/core/resource/DnsResolvers.java
index 54e2936349..ef1348b4a3 100644
--- a/src/main/java/io/lettuce/core/resource/DnsResolvers.java
+++ b/src/main/java/io/lettuce/core/resource/DnsResolvers.java
@@ -1,5 +1,7 @@
 package io.lettuce.core.resource;
 
+import io.netty.resolver.AddressResolverGroup;
+
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 
@@ -13,6 +15,8 @@ public enum DnsResolvers implements DnsResolver {
 
     /**
      * Java VM default resolver.
+     *
+     * @deprecated since 6.7. Configure {@link AddressResolverGroup} instead.
      */
     JVM_DEFAULT {
 
diff --git a/src/test/java/io/lettuce/core/resource/DefaultClientResourcesUnitTests.java b/src/test/java/io/lettuce/core/resource/DefaultClientResourcesUnitTests.java
index 46a89396a0..9c73ff5135 100644
--- a/src/test/java/io/lettuce/core/resource/DefaultClientResourcesUnitTests.java
+++ b/src/test/java/io/lettuce/core/resource/DefaultClientResourcesUnitTests.java
@@ -27,6 +27,7 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 
+import io.netty.resolver.dns.DnsAddressResolverGroup;
 import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 
@@ -112,6 +113,15 @@ void testDnsResolver() {
         assertThat(sut.dnsResolver()).isEqualTo(dirContextDnsResolver);
     }
 
+    @Test
+    void testShouldUseDnsAddressResolverGroup() {
+        DefaultClientResources sut = DefaultClientResources.create();
+        AddressResolverGroup<?> addressResolverGroup = sut.addressResolverGroup();
+
+        assertThat(addressResolverGroup).as("Default AddressResolverGroup should be DnsAddressResolverGroup")
+                .isInstanceOf(DnsAddressResolverGroup.class);
+    }
+
     @Test
     void testProvidedResources() {