diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2fb8ce44aa9ff0a6ad0fa00068a830f39b4cd6c1..974a9bef93a549b07b98bcaaaeb5096dd4d5b882 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ stages:
 
 variables:
   CPU_CORES: "10"
-  OCAML: "ocaml-base-compiler.4.08.1"
+  OCAML: "ocaml-base-compiler.4.07.1"
 
 .template: &template
   stage: build