diff --git a/pom.xml b/pom.xml
index 98a6fe892..3a3b6b0d2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,7 +46,7 @@
     <!-- can be updated to latest version with Dropwizard 5 (Jetty 12); will then need to disable telemetry -->
     <dynamodblocal.version>2.2.1</dynamodblocal.version>
     <google-cloud-libraries.version>26.57.0</google-cloud-libraries.version>
-    <grpc.version>1.69.0</grpc.version> <!-- should be kept in sync with the value from Google libraries-bom -->
+    <grpc.version>1.70.0</grpc.version> <!-- should be kept in sync with the value from Google libraries-bom -->
     <gson.version>2.12.1</gson.version>
     <!-- several libraries (AWS, Google Cloud) use Apache http components transitively, and we need to align them -->
     <httpcore.version>4.4.16</httpcore.version>
@@ -65,9 +65,9 @@
     <luajava.version>3.5.0</luajava.version>
     <micrometer.version>1.14.5</micrometer.version>
     <netty.version>4.1.119.Final</netty.version>
-    <!-- Must be greater than or equal to the value from Google libraries-bom
-    since some of its libraries generate code. See https://protobuf.dev/support/cross-version-runtime-guarantee/. -->
-    <protobuf.version>3.25.5</protobuf.version>
+    <!-- Must be less than or equal to the value from Google libraries-bom which controls the protobuf runtime version.
+    See https://protobuf.dev/support/cross-version-runtime-guarantee/. -->
+    <protoc.version>4.29.4</protoc.version>
     <pushy.version>0.15.4</pushy.version>
     <reactive.grpc.version>1.2.4</reactive.grpc.version>
     <reactor-bom.version>2024.0.4</reactor-bom.version> <!-- 3.7.4, see https://github.com/reactor/reactor#bom-versioning-scheme -->
@@ -127,7 +127,7 @@
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
-        <artifactId>libraries-bom-protobuf3</artifactId>
+        <artifactId>libraries-bom</artifactId>
         <version>${google-cloud-libraries.version}</version>
         <type>pom</type>
         <scope>import</scope>
@@ -175,11 +175,6 @@
         <artifactId>pushy-dropwizard-metrics-listener</artifactId>
         <version>${pushy.version}</version>
       </dependency>
-      <dependency>
-        <groupId>com.google.protobuf</groupId>
-        <artifactId>protobuf-java</artifactId>
-        <version>${protobuf.version}</version>
-      </dependency>
       <dependency>
         <groupId>com.googlecode.libphonenumber</groupId>
         <artifactId>libphonenumber</artifactId>
@@ -443,7 +438,7 @@
         <version>0.6.1</version>
         <configuration>
           <checkStaleness>false</checkStaleness>
-          <protocArtifact>com.google.protobuf:protoc:${protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}</protocArtifact>
           <pluginId>grpc-java</pluginId>
           <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
 
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/ValidatingInterceptor.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/ValidatingInterceptor.java
index 97f5c0363..db7b640f6 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/ValidatingInterceptor.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/ValidatingInterceptor.java
@@ -8,7 +8,7 @@ package org.whispersystems.textsecuregcm.grpc;
 import static org.whispersystems.textsecuregcm.grpc.validators.ValidatorUtils.internalError;
 
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import io.grpc.ForwardingServerCallListener;
 import io.grpc.Metadata;
 import io.grpc.ServerCall;
@@ -75,7 +75,7 @@ public class ValidatingInterceptor implements ServerInterceptor {
   }
 
   private void validateMessage(final Object message) throws StatusException {
-    if (message instanceof GeneratedMessageV3 msg) {
+    if (message instanceof Message msg) {
       try {
         for (final Descriptors.FieldDescriptor fd: msg.getDescriptorForType().getFields()) {
           for (final Map.Entry<Descriptors.FieldDescriptor, Object> entry: fd.getOptions().getAllFields().entrySet()) {
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/BaseFieldValidator.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/BaseFieldValidator.java
index c9707fd86..4c84d3980 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/BaseFieldValidator.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/BaseFieldValidator.java
@@ -11,7 +11,6 @@ import static org.whispersystems.textsecuregcm.grpc.validators.ValidatorUtils.in
 
 import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
 import com.google.protobuf.Message;
 import io.grpc.Status;
 import io.grpc.StatusException;
@@ -49,7 +48,7 @@ public abstract class BaseFieldValidator<T> implements FieldValidator {
   public void validate(
       final Object extensionValue,
       final Descriptors.FieldDescriptor fd,
-      final GeneratedMessageV3 msg) throws StatusException {
+      final Message msg) throws StatusException {
     try {
       final T extensionValueTyped = resolveExtensionValue(extensionValue);
 
@@ -116,7 +115,7 @@ public abstract class BaseFieldValidator<T> implements FieldValidator {
   protected void validateRepeatedField(
       final T extensionValue,
       final Descriptors.FieldDescriptor fd,
-      final GeneratedMessageV3 msg) throws StatusException {
+      final Message msg) throws StatusException {
     throw internalError("`validateRepeatedField` method needs to be implemented");
   }
 
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/ExactlySizeFieldValidator.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/ExactlySizeFieldValidator.java
index 1bd0ce009..6eed659d1 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/ExactlySizeFieldValidator.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/ExactlySizeFieldValidator.java
@@ -9,7 +9,7 @@ import static org.whispersystems.textsecuregcm.grpc.validators.ValidatorUtils.in
 
 import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import io.grpc.StatusException;
 import java.util.List;
 import java.util.Set;
@@ -53,7 +53,7 @@ public class ExactlySizeFieldValidator extends BaseFieldValidator<Set<Integer>>
   protected void validateRepeatedField(
       final Set<Integer> permittedSizes,
       final Descriptors.FieldDescriptor fd,
-      final GeneratedMessageV3 msg) throws StatusException {
+      final Message msg) throws StatusException {
     final int size = msg.getRepeatedFieldCount(fd);
     if (permittedSizes.contains(size)) {
       return;
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/FieldValidator.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/FieldValidator.java
index 7283602bb..cdf668e90 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/FieldValidator.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/FieldValidator.java
@@ -6,11 +6,11 @@
 package org.whispersystems.textsecuregcm.grpc.validators;
 
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import io.grpc.StatusException;
 
 public interface FieldValidator {
 
-  void validate(Object extensionValue, Descriptors.FieldDescriptor fd, GeneratedMessageV3 msg)
+  void validate(Object extensionValue, Descriptors.FieldDescriptor fd, Message msg)
       throws StatusException;
 }
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/NonEmptyFieldValidator.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/NonEmptyFieldValidator.java
index 05460d0c3..91bb256b3 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/NonEmptyFieldValidator.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/NonEmptyFieldValidator.java
@@ -9,7 +9,7 @@ import static org.whispersystems.textsecuregcm.grpc.validators.ValidatorUtils.in
 
 import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import io.grpc.StatusException;
 import java.util.Set;
 import org.apache.commons.lang3.StringUtils;
@@ -52,7 +52,7 @@ public class NonEmptyFieldValidator extends BaseFieldValidator<Boolean> {
   protected void validateRepeatedField(
       final Boolean extensionValue,
       final Descriptors.FieldDescriptor fd,
-      final GeneratedMessageV3 msg) throws StatusException {
+      final Message msg) throws StatusException {
     if (msg.getRepeatedFieldCount(fd) > 0) {
       return;
     }
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/SizeFieldValidator.java b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/SizeFieldValidator.java
index 532b84059..8d8fd2298 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/SizeFieldValidator.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/grpc/validators/SizeFieldValidator.java
@@ -9,7 +9,7 @@ import static org.whispersystems.textsecuregcm.grpc.validators.ValidatorUtils.in
 
 import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import io.grpc.StatusException;
 import java.util.Set;
 import org.signal.chat.require.SizeConstraint;
@@ -48,7 +48,7 @@ public class SizeFieldValidator extends BaseFieldValidator<Range> {
   }
 
   @Override
-  protected void validateRepeatedField(final Range range, final Descriptors.FieldDescriptor fd, final GeneratedMessageV3 msg) throws StatusException {
+  protected void validateRepeatedField(final Range range, final Descriptors.FieldDescriptor fd, final Message msg) throws StatusException {
     final int size = msg.getRepeatedFieldCount(fd);
     if (size < range.min() || size > range.max()) {
       throw invalidArgument("field value is [%d] but expected to be within the [%d, %d] range".formatted(