diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 42e5d5a..32d6b82 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -209,6 +209,7 @@ build:
     - sudo apt-get update
     - "[ -d _opam ] || opam switch create --yes --no-install . $OCAML_COMPILER"
     - eval $(opam env)
+    - opam repository set-url default https://opam.ocaml.org
     - opam update
     - sudo apt-get install nodejs python3 -y