diff --git a/bench.Dockerfile b/bench.Dockerfile
index c6bb8bb5d..f94e042ad 100644
--- a/bench.Dockerfile
+++ b/bench.Dockerfile
@@ -1,4 +1,4 @@
-FROM ocaml/opam:ubuntu-20.04-ocaml-4.14
+FROM ocaml/opam:ubuntu-20.04-ocaml-5.2
 
 WORKDIR /app