diff --git a/core/src/main/java/io/grpc/internal/Http2ClientStreamTransportState.java b/core/src/main/java/io/grpc/internal/Http2ClientStreamTransportState.java
index cc36ed3c0b..e92bb7a4af 100644
--- a/core/src/main/java/io/grpc/internal/Http2ClientStreamTransportState.java
+++ b/core/src/main/java/io/grpc/internal/Http2ClientStreamTransportState.java
@@ -16,7 +16,6 @@
 
 package io.grpc.internal;
 
-import com.google.common.base.Charsets;
 import com.google.common.base.Preconditions;
 import io.grpc.CallOptions;
 import io.grpc.InternalMetadata;
@@ -24,6 +23,7 @@ import io.grpc.InternalStatus;
 import io.grpc.Metadata;
 import io.grpc.Status;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import javax.annotation.Nullable;
 
 /**
@@ -62,7 +62,7 @@ public abstract class Http2ClientStreamTransportState extends AbstractClientStre
   /** When non-{@code null}, {@link #transportErrorMetadata} must also be non-{@code null}. */
   private Status transportError;
   private Metadata transportErrorMetadata;
-  private Charset errorCharset = Charsets.UTF_8;
+  private Charset errorCharset = StandardCharsets.UTF_8;
   private boolean headersReceived;
 
   protected Http2ClientStreamTransportState(
@@ -241,7 +241,7 @@ public abstract class Http2ClientStreamTransportState extends AbstractClientStre
         // Ignore and assume UTF-8
       }
     }
-    return Charsets.UTF_8;
+    return StandardCharsets.UTF_8;
   }
 
   /**
diff --git a/core/src/test/java/io/grpc/internal/MessageDeframerTest.java b/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
index 98ed069145..1ec1ccb208 100644
--- a/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
+++ b/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
@@ -31,7 +31,6 @@ import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 
-import com.google.common.base.Charsets;
 import com.google.common.io.ByteStreams;
 import com.google.common.primitives.Bytes;
 import io.grpc.Codec;
@@ -46,6 +45,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
@@ -347,7 +347,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readByteBelowLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 4, statsTraceCtx);
 
@@ -360,7 +360,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readByteAtLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 3, statsTraceCtx);
 
@@ -373,7 +373,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readByteAboveLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 2, statsTraceCtx);
 
@@ -390,7 +390,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readBelowLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 4, statsTraceCtx);
       byte[] buf = new byte[10];
@@ -404,7 +404,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readAtLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 3, statsTraceCtx);
       byte[] buf = new byte[10];
@@ -418,7 +418,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_readAboveLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 2, statsTraceCtx);
       byte[] buf = new byte[10];
@@ -435,7 +435,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_skipBelowLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 4, statsTraceCtx);
 
@@ -449,7 +449,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_skipAtLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 3, statsTraceCtx);
 
@@ -462,7 +462,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_skipAboveLimit() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 2, statsTraceCtx);
 
@@ -478,7 +478,7 @@ public class MessageDeframerTest {
 
     @Test
     public void sizeEnforcingInputStream_markReset() throws IOException {
-      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(Charsets.UTF_8));
+      ByteArrayInputStream in = new ByteArrayInputStream("foo".getBytes(StandardCharsets.UTF_8));
       SizeEnforcingInputStream stream =
               new MessageDeframer.SizeEnforcingInputStream(in, 3, statsTraceCtx);
       // stream currently looks like: |foo
diff --git a/gcp-observability/src/main/java/io/grpc/gcp/observability/ObservabilityConfigImpl.java b/gcp-observability/src/main/java/io/grpc/gcp/observability/ObservabilityConfigImpl.java
index 2b0a44473d..ae74bf10c4 100644
--- a/gcp-observability/src/main/java/io/grpc/gcp/observability/ObservabilityConfigImpl.java
+++ b/gcp-observability/src/main/java/io/grpc/gcp/observability/ObservabilityConfigImpl.java
@@ -19,7 +19,6 @@ package io.grpc.gcp.observability;
 import static com.google.common.base.Preconditions.checkArgument;
 
 import com.google.cloud.ServiceOptions;
-import com.google.common.base.Charsets;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
@@ -28,6 +27,7 @@ import io.grpc.internal.JsonUtil;
 import io.opencensus.trace.Sampler;
 import io.opencensus.trace.samplers.Samplers;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.Collections;
@@ -75,7 +75,7 @@ final class ObservabilityConfigImpl implements ObservabilityConfig {
 
   void parseFile(String configFile) throws IOException {
     String configFileContent =
-        new String(Files.readAllBytes(Paths.get(configFile)), Charsets.UTF_8);
+        new String(Files.readAllBytes(Paths.get(configFile)), StandardCharsets.UTF_8);
     checkArgument(!configFileContent.isEmpty(), CONFIG_FILE_ENV_VAR_NAME + " is empty!");
     parse(configFileContent);
   }
diff --git a/gcp-observability/src/test/java/io/grpc/gcp/observability/ObservabilityConfigImplTest.java b/gcp-observability/src/test/java/io/grpc/gcp/observability/ObservabilityConfigImplTest.java
index d6f23fbcc9..a9e0d6e223 100644
--- a/gcp-observability/src/test/java/io/grpc/gcp/observability/ObservabilityConfigImplTest.java
+++ b/gcp-observability/src/test/java/io/grpc/gcp/observability/ObservabilityConfigImplTest.java
@@ -21,12 +21,12 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-import com.google.common.base.Charsets;
 import io.grpc.gcp.observability.ObservabilityConfig.LogFilter;
 import io.opencensus.trace.Sampler;
 import io.opencensus.trace.samplers.Samplers;
 import java.io.File;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.Collections;
@@ -401,7 +401,8 @@ public class ObservabilityConfigImplTest {
   public void configFileLogFilters() throws Exception {
     File configFile = tempFolder.newFile();
     Files.write(
-        Paths.get(configFile.getAbsolutePath()), CLIENT_LOG_FILTERS.getBytes(Charsets.US_ASCII));
+        Paths.get(configFile.getAbsolutePath()),
+        CLIENT_LOG_FILTERS.getBytes(StandardCharsets.US_ASCII));
     observabilityConfig.parseFile(configFile.getAbsolutePath());
     assertTrue(observabilityConfig.isEnableCloudLogging());
     assertThat(observabilityConfig.getProjectId()).isEqualTo("grpc-testing");
diff --git a/googleapis/src/main/java/io/grpc/googleapis/GoogleCloudToProdNameResolver.java b/googleapis/src/main/java/io/grpc/googleapis/GoogleCloudToProdNameResolver.java
index 64c2e0f9c8..ebc7dd05ea 100644
--- a/googleapis/src/main/java/io/grpc/googleapis/GoogleCloudToProdNameResolver.java
+++ b/googleapis/src/main/java/io/grpc/googleapis/GoogleCloudToProdNameResolver.java
@@ -19,7 +19,6 @@ package io.grpc.googleapis;
 import static com.google.common.base.Preconditions.checkNotNull;
 
 import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Charsets;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
@@ -41,6 +40,7 @@ import java.net.HttpURLConnection;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.Map;
 import java.util.Random;
 import java.util.concurrent.Executor;
@@ -263,7 +263,7 @@ final class GoogleCloudToProdNameResolver extends NameResolver {
       if (con.getResponseCode() != 200) {
         return "";
       }
-      try (Reader reader = new InputStreamReader(con.getInputStream(), Charsets.UTF_8)) {
+      try (Reader reader = new InputStreamReader(con.getInputStream(), StandardCharsets.UTF_8)) {
         respBody = CharStreams.toString(reader);
       }
     } finally {
diff --git a/okhttp/src/test/java/io/grpc/okhttp/AsyncSinkTest.java b/okhttp/src/test/java/io/grpc/okhttp/AsyncSinkTest.java
index 46011588b1..478e18d0a2 100644
--- a/okhttp/src/test/java/io/grpc/okhttp/AsyncSinkTest.java
+++ b/okhttp/src/test/java/io/grpc/okhttp/AsyncSinkTest.java
@@ -30,11 +30,11 @@ import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.verify;
 
-import com.google.common.base.Charsets;
 import io.grpc.internal.SerializingExecutor;
 import io.grpc.okhttp.ExceptionHandlingFrameWriter.TransportExceptionHandler;
 import java.io.IOException;
 import java.net.Socket;
+import java.nio.charset.StandardCharsets;
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.Executor;
@@ -73,8 +73,8 @@ public class AsyncSinkTest {
 
   @Test
   public void flushCoalescing_shouldNotMergeTwoDistinctFlushes() throws IOException {
-    byte[] firstData = "a string".getBytes(Charsets.UTF_8);
-    byte[] secondData = "a longer string".getBytes(Charsets.UTF_8);
+    byte[] firstData = "a string".getBytes(StandardCharsets.UTF_8);
+    byte[] secondData = "a longer string".getBytes(StandardCharsets.UTF_8);
 
     sink.becomeConnected(mockedSink, socket);
     Buffer buffer = new Buffer();
@@ -95,8 +95,8 @@ public class AsyncSinkTest {
 
   @Test
   public void flushCoalescing_shouldMergeTwoQueuedFlushesAndWrites() throws IOException {
-    byte[] firstData = "a string".getBytes(Charsets.UTF_8);
-    byte[] secondData = "a longer string".getBytes(Charsets.UTF_8);
+    byte[] firstData = "a string".getBytes(StandardCharsets.UTF_8);
+    byte[] secondData = "a longer string".getBytes(StandardCharsets.UTF_8);
     Buffer buffer = new Buffer().write(firstData);
     sink.becomeConnected(mockedSink, socket);
     sink.write(buffer, buffer.size());
@@ -115,8 +115,8 @@ public class AsyncSinkTest {
 
   @Test
   public void flushCoalescing_shouldMergeWrites() throws IOException {
-    byte[] firstData = "a string".getBytes(Charsets.UTF_8);
-    byte[] secondData = "a longer string".getBytes(Charsets.UTF_8);
+    byte[] firstData = "a string".getBytes(StandardCharsets.UTF_8);
+    byte[] secondData = "a longer string".getBytes(StandardCharsets.UTF_8);
     Buffer buffer = new Buffer();
     sink.becomeConnected(mockedSink, socket);
     sink.write(buffer.write(firstData), buffer.size());
diff --git a/services/src/main/java/io/grpc/protobuf/services/BinlogHelper.java b/services/src/main/java/io/grpc/protobuf/services/BinlogHelper.java
index 845ec1036a..e810c983be 100644
--- a/services/src/main/java/io/grpc/protobuf/services/BinlogHelper.java
+++ b/services/src/main/java/io/grpc/protobuf/services/BinlogHelper.java
@@ -22,7 +22,6 @@ import static com.google.common.base.Preconditions.checkState;
 import static io.grpc.protobuf.services.BinaryLogProvider.BYTEARRAY_MARSHALLER;
 
 import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Charsets;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Splitter;
 import com.google.protobuf.ByteString;
@@ -59,6 +58,7 @@ import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -841,7 +841,7 @@ final class BinlogHelper {
     if (serialized != null) {
       int curBytes = 0;
       for (int i = 0; i < serialized.length; i += 2) {
-        String key = new String(serialized[i], Charsets.UTF_8);
+        String key = new String(serialized[i], StandardCharsets.UTF_8);
         byte[] value = serialized[i + 1];
         if (NEVER_INCLUDED_METADATA.contains(key)) {
           continue;
diff --git a/services/src/test/java/io/grpc/protobuf/services/ChannelzProtoUtilTest.java b/services/src/test/java/io/grpc/protobuf/services/ChannelzProtoUtilTest.java
index 4098885fd0..0d2e6063d5 100644
--- a/services/src/test/java/io/grpc/protobuf/services/ChannelzProtoUtilTest.java
+++ b/services/src/test/java/io/grpc/protobuf/services/ChannelzProtoUtilTest.java
@@ -22,7 +22,6 @@ import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
-import com.google.common.base.Charsets;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.protobuf.Any;
@@ -82,6 +81,7 @@ import io.netty.channel.unix.DomainSocketAddress;
 import java.net.Inet4Address;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
 import java.security.cert.Certificate;
 import java.util.Arrays;
 import java.util.Collections;
@@ -437,8 +437,8 @@ public final class ChannelzProtoUtilTest {
   public void socketSecurityTls() throws Exception {
     Certificate local = mock(Certificate.class);
     Certificate remote = mock(Certificate.class);
-    when(local.getEncoded()).thenReturn("localcert".getBytes(Charsets.UTF_8));
-    when(remote.getEncoded()).thenReturn("remotecert".getBytes(Charsets.UTF_8));
+    when(local.getEncoded()).thenReturn("localcert".getBytes(StandardCharsets.UTF_8));
+    when(remote.getEncoded()).thenReturn("remotecert".getBytes(StandardCharsets.UTF_8));
 
     socket.security = new InternalChannelz.Security(
         new InternalChannelz.Tls("TLS_NULL_WITH_NULL_NULL", local, remote));
@@ -446,8 +446,8 @@ public final class ChannelzProtoUtilTest {
         Security.newBuilder().setTls(
             Tls.newBuilder()
             .setStandardName("TLS_NULL_WITH_NULL_NULL")
-            .setLocalCertificate(ByteString.copyFrom("localcert", Charsets.UTF_8))
-            .setRemoteCertificate(ByteString.copyFrom("remotecert", Charsets.UTF_8)))
+            .setLocalCertificate(ByteString.copyFrom("localcert", StandardCharsets.UTF_8))
+            .setRemoteCertificate(ByteString.copyFrom("remotecert", StandardCharsets.UTF_8)))
         .build(),
         ChannelzProtoUtil.toSocket(socket).getSecurity());
 
@@ -457,7 +457,7 @@ public final class ChannelzProtoUtilTest {
         Security.newBuilder().setTls(
             Tls.newBuilder()
             .setStandardName("TLS_NULL_WITH_NULL_NULL")
-            .setRemoteCertificate(ByteString.copyFrom("remotecert", Charsets.UTF_8)))
+            .setRemoteCertificate(ByteString.copyFrom("remotecert", StandardCharsets.UTF_8)))
         .build(),
         ChannelzProtoUtil.toSocket(socket).getSecurity());
 
@@ -467,7 +467,7 @@ public final class ChannelzProtoUtilTest {
         Security.newBuilder().setTls(
             Tls.newBuilder()
                 .setStandardName("TLS_NULL_WITH_NULL_NULL")
-                .setLocalCertificate(ByteString.copyFrom("localcert", Charsets.UTF_8)))
+                .setLocalCertificate(ByteString.copyFrom("localcert", StandardCharsets.UTF_8)))
             .build(),
             ChannelzProtoUtil.toSocket(socket).getSecurity());
   }
diff --git a/util/src/test/java/io/grpc/util/CertificateUtilsTest.java b/util/src/test/java/io/grpc/util/CertificateUtilsTest.java
index aef99c0f37..dbddd35bca 100644
--- a/util/src/test/java/io/grpc/util/CertificateUtilsTest.java
+++ b/util/src/test/java/io/grpc/util/CertificateUtilsTest.java
@@ -18,12 +18,12 @@ package io.grpc.util;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import com.google.common.base.Charsets;
 import io.grpc.internal.testing.TestUtils;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.PrivateKey;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
@@ -80,7 +80,7 @@ public class CertificateUtilsTest {
 
   @Test
   public void readBadFormatKeyFile() throws Exception {
-    InputStream in = new ByteArrayInputStream(BAD_PEM_FORMAT.getBytes(Charsets.UTF_8));
+    InputStream in = new ByteArrayInputStream(BAD_PEM_FORMAT.getBytes(StandardCharsets.UTF_8));
     try {
       CertificateUtils.getPrivateKey(in);
       Assert.fail("no exception thrown");
@@ -92,7 +92,7 @@ public class CertificateUtilsTest {
 
   @Test
   public void readBadContentKeyFile() {
-    InputStream in = new ByteArrayInputStream(BAD_PEM_CONTENT.getBytes(Charsets.UTF_8));
+    InputStream in = new ByteArrayInputStream(BAD_PEM_CONTENT.getBytes(StandardCharsets.UTF_8));
     try {
       CertificateUtils.getPrivateKey(in);
       Assert.fail("no exception thrown");