diff --git a/.cloudbuild/library_generation/library_generation.Dockerfile b/.cloudbuild/library_generation/library_generation.Dockerfile
index fd10cd7bee4..0f285934740 100644
--- a/.cloudbuild/library_generation/library_generation.Dockerfile
+++ b/.cloudbuild/library_generation/library_generation.Dockerfile
@@ -19,7 +19,7 @@ SHELL [ "/bin/bash", "-c" ]
 
 ARG OWLBOT_CLI_COMMITTISH=ac84fa5c423a0069bbce3d2d869c9730c8fdf550
 ARG PROTOC_VERSION=25.3
-ARG GRPC_VERSION=1.65.1
+ARG GRPC_VERSION=1.66.0
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"
 
diff --git a/gapic-generator-java-pom-parent/pom.xml b/gapic-generator-java-pom-parent/pom.xml
index 88322c673f6..175c772a824 100644
--- a/gapic-generator-java-pom-parent/pom.xml
+++ b/gapic-generator-java-pom-parent/pom.xml
@@ -26,7 +26,7 @@
     <!-- External dependencies, especially gRPC and Protobuf version, should be
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
-    <grpc.version>1.65.1</grpc.version>
+    <grpc.version>1.66.0</grpc.version>
     <google.auth.version>1.24.1</google.auth.version>
     <google.http-client.version>1.44.2</google.http-client.version>
     <gson.version>2.11.0</gson.version>
diff --git a/gax-java/dependencies.properties b/gax-java/dependencies.properties
index ce7e6c6abb0..32a3bca7f8d 100644
--- a/gax-java/dependencies.properties
+++ b/gax-java/dependencies.properties
@@ -28,7 +28,7 @@ version.gax_httpjson=2.51.1-SNAPSHOT
 
 version.com_google_protobuf=3.25.3
 version.google_java_format=1.15.0
-version.io_grpc=1.65.1
+version.io_grpc=1.66.0
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).