diff --git a/tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client b/tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client
index a879677bd59c5..2bb13eb9b4cc2 100644
--- a/tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client
+++ b/tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client
@@ -14,7 +14,7 @@
 
 # Dockerfile for building //test/cpp/interop:xds_interop_client
 
-FROM python:3.9-slim-bookworm
+FROM python:3.13.9-slim-bookworm
 
 RUN apt-get update -y && apt-get upgrade -y && apt-get install -y build-essential clang curl
 
@@ -31,7 +31,7 @@ ENV TINI_VERSION v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 RUN chmod +x /tini
 
-FROM python:3.9-slim-bookworm
+FROM python:3.13.9-slim-bookworm
 
 ENV GRPC_VERBOSITY="DEBUG"
 ENV GRPC_TRACE="xds_client,xds_resolver,xds_cluster_manager_lb,cds_lb,xds_cluster_resolver_lb,priority_lb,xds_cluster_impl_lb,weighted_target_lb,xds_server_config_fetcher,ring_hash_lb,outlier_detection_lb,xds_wrr_locality_lb,xds_override_host_lb"