diff --git a/Dockerfile b/Dockerfile
index deb8187..99b7fd0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ RUN sudo ln -sf /home/opam/.cargo/bin/rustc /usr/bin/rustc
 WORKDIR /home/opam/src
 RUN opam repository add opam-repository git+https://github.com/ocaml/opam-repository.git
 RUN opam update -y
-RUN opam install -j $(nproc) dune -y
+RUN opam install -j 1 dune -y
 RUN opam install -j $(nproc) opam-monorepo -y
 RUN opam repository add dune-universe git+https://github.com/dune-universe/opam-overlays.git
 RUN opam monorepo pull