diff --git a/substrate/.gitlab-ci.yml b/substrate/.gitlab-ci.yml
index 12c019b3e2..b6f5116f7b 100644
--- a/substrate/.gitlab-ci.yml
+++ b/substrate/.gitlab-ci.yml
@@ -165,7 +165,7 @@ build:rust:doc:release:            &build
     - linux-docker
   script:
     - rm -f ./crate-docs/index.html # use it as an indicator if the job succeeds
-    - time cargo doc --release --verbose
+    - time cargo +nightly doc --release --verbose
     - cp -R ./target/doc ./crate-docs
     - echo "<meta http-equiv=refresh content=0;url=substrate_service/index.html>" > ./crate-docs/index.html