diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e3bfc4509f04d164b1cf5b8c3d586f6a54bd55f7..e6a2cd2ed3c5024cadcf228e3d2b523cfa2b7b83 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