diff --git a/bench.Dockerfile b/bench.Dockerfile
index 104616e1fc..01998befe8 100644
--- a/bench.Dockerfile
+++ b/bench.Dockerfile
@@ -1,4 +1,4 @@
-FROM ocaml/opam:debian-ocaml-5.2
+FROM ocaml/opam:debian-ocaml-5.3
 WORKDIR /bench-dir
 
 RUN sudo apt-get update \