diff --git a/benchmarks/ycsb/runner/Dockerfile b/benchmarks/ycsb/runner/Dockerfile
index 6bc9fd6bf..ad683d658 100644
--- a/benchmarks/ycsb/runner/Dockerfile
+++ b/benchmarks/ycsb/runner/Dockerfile
@@ -2,9 +2,9 @@
 # benchmark. Runs as a non-root user (the Actions runner refuses to run as root).
 # The registration token is supplied at runtime (never baked in); the host loop
 # (run-bench-runner.sh) mints a fresh token and starts one container per job.
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 
-ARG RUNNER_VERSION=2.334.0
+ARG RUNNER_VERSION=2.336.0
 ENV DEBIAN_FRONTEND=noninteractive
 
 # Toolchain for harper-pro's native deps (rocksdb-js / lmdb prebuilds + gyp fallback) + node 24.