diff --git a/netty/src/test/java/io/grpc/netty/NettyClientHandlerTest.java b/netty/src/test/java/io/grpc/netty/NettyClientHandlerTest.java
index bbe9fab9233..73988f773cb 100644
--- a/netty/src/test/java/io/grpc/netty/NettyClientHandlerTest.java
+++ b/netty/src/test/java/io/grpc/netty/NettyClientHandlerTest.java
@@ -16,7 +16,6 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
 import static com.google.common.truth.Truth.assertThat;
 import static io.grpc.internal.ClientStreamListener.RpcProgress.MISCARRIED;
 import static io.grpc.internal.ClientStreamListener.RpcProgress.PROCESSED;
@@ -30,6 +29,7 @@
 import static io.grpc.netty.Utils.TE_HEADER;
 import static io.grpc.netty.Utils.TE_TRAILERS;
 import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_PRIORITY_WEIGHT;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
diff --git a/netty/src/test/java/io/grpc/netty/NettyClientTransportTest.java b/netty/src/test/java/io/grpc/netty/NettyClientTransportTest.java
index b40cd9d5607..9777bb0926c 100644
--- a/netty/src/test/java/io/grpc/netty/NettyClientTransportTest.java
+++ b/netty/src/test/java/io/grpc/netty/NettyClientTransportTest.java
@@ -16,7 +16,6 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.TruthJUnit.assume;
 import static io.grpc.internal.GrpcUtil.DEFAULT_MAX_MESSAGE_SIZE;
@@ -29,6 +28,7 @@
 import static io.grpc.netty.NettyServerBuilder.MAX_CONNECTION_IDLE_NANOS_DISABLED;
 import static io.grpc.netty.NettyServerBuilder.MAX_RST_COUNT_DISABLED;
 import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_WINDOW_SIZE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
diff --git a/netty/src/test/java/io/grpc/netty/NettyHandlerTestBase.java b/netty/src/test/java/io/grpc/netty/NettyHandlerTestBase.java
index fbab1ca5fae..eef8d30e05a 100644
--- a/netty/src/test/java/io/grpc/netty/NettyHandlerTestBase.java
+++ b/netty/src/test/java/io/grpc/netty/NettyHandlerTestBase.java
@@ -16,8 +16,8 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
 import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_WINDOW_SIZE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.mockito.AdditionalAnswers.delegatesTo;
 import static org.mockito.ArgumentMatchers.any;
diff --git a/netty/src/test/java/io/grpc/netty/NettyReadableBufferTest.java b/netty/src/test/java/io/grpc/netty/NettyReadableBufferTest.java
index 1a0ac229a89..4f10504c07d 100644
--- a/netty/src/test/java/io/grpc/netty/NettyReadableBufferTest.java
+++ b/netty/src/test/java/io/grpc/netty/NettyReadableBufferTest.java
@@ -16,7 +16,7 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
diff --git a/netty/src/test/java/io/grpc/netty/NettyServerHandlerTest.java b/netty/src/test/java/io/grpc/netty/NettyServerHandlerTest.java
index ce902a9620b..541490847c0 100644
--- a/netty/src/test/java/io/grpc/netty/NettyServerHandlerTest.java
+++ b/netty/src/test/java/io/grpc/netty/NettyServerHandlerTest.java
@@ -16,7 +16,6 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
 import static io.grpc.internal.GrpcUtil.DEFAULT_MAX_MESSAGE_SIZE;
 import static io.grpc.internal.GrpcUtil.DEFAULT_SERVER_KEEPALIVE_TIMEOUT_NANOS;
 import static io.grpc.internal.GrpcUtil.DEFAULT_SERVER_KEEPALIVE_TIME_NANOS;
@@ -29,6 +28,7 @@
 import static io.grpc.netty.Utils.HTTP_METHOD;
 import static io.grpc.netty.Utils.TE_HEADER;
 import static io.grpc.netty.Utils.TE_TRAILERS;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
diff --git a/netty/src/test/java/io/grpc/netty/NettyStreamTestBase.java b/netty/src/test/java/io/grpc/netty/NettyStreamTestBase.java
index f073fb6b2e4..ce42e3d25df 100644
--- a/netty/src/test/java/io/grpc/netty/NettyStreamTestBase.java
+++ b/netty/src/test/java/io/grpc/netty/NettyStreamTestBase.java
@@ -16,8 +16,8 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.US_ASCII;
 import static io.grpc.netty.NettyTestUtil.messageFrame;
+import static java.nio.charset.StandardCharsets.US_ASCII;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
diff --git a/netty/src/test/java/io/grpc/netty/ProtocolNegotiatorsTest.java b/netty/src/test/java/io/grpc/netty/ProtocolNegotiatorsTest.java
index 1852213da52..6939d835892 100644
--- a/netty/src/test/java/io/grpc/netty/ProtocolNegotiatorsTest.java
+++ b/netty/src/test/java/io/grpc/netty/ProtocolNegotiatorsTest.java
@@ -16,10 +16,10 @@
 
 package io.grpc.netty;
 
-import static com.google.common.base.Charsets.UTF_8;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Preconditions.checkState;
 import static com.google.common.truth.Truth.assertThat;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;