diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2a957d10c070865148a960f8cffd65e61ee7fbc7..b2fa4bb82b39d65d9a1429f0ab8f93b985ad1512 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,7 +17,7 @@ variables:
   CARGO_TARGET_DIR:                "/ci-cache/${CI_PROJECT_NAME}/targets/${CI_COMMIT_REF_NAME}/${CI_JOB_NAME}"
   CI_SERVER_NAME:                  "GitLab CI"
   REGISTRY:                        "paritytech"
-  RUSTUP_TOOLCHAIN:                nightly
+  RUSTUP_TOOLCHAIN:                nightly-2020-10-01
   RUST_LIB_BACKTRACE:              0
 
 .collect-artifacts:                &collect-artifacts