diff --git a/Dockerfile b/Dockerfile
index 70939a277..e5d8069aa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,8 @@ FROM ocaml/opam:debian-11-ocaml-5.0
 RUN sudo ln -sf /usr/bin/opam-2.1 /usr/bin/opam
 # Add the alpha repository with some required preview versions of dependencies:
 RUN opam remote add alpha git+https://github.com/kit-ty-kate/opam-alpha-repository.git
+# Ensure opam-repository is up-to-date:
+RUN cd opam-repository && git pull origin 42a177d7ac37cd347aab366a90d20469203fc926 && opam update
 # Install utop for interactive use:
 RUN opam install utop fmt
 # Install Eio's dependencies (adding just the opam files first to help with caching):