diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 25d067fb946786605de4ff19726e7cec6390c8a7..0fd9dc2817a5c1b7e4e91ffc6bd725376d65f3c4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -112,7 +112,7 @@ deploy:documentation:
     - tags
     - triggers
   script:
-    - "curl --request POST --form token=$WEBSITE_TOKEN --form ref=master --form \"variables[RELEASE_CI_BUILD_REF_NAME]=$CI_BUILD_REF_NAME\" --form \"variables[RELEASE_CI_BUILD_ID]=$CI_BUILD_ID\" https://gitlab.labs.nic.cz/api/v3/projects/5/trigger/builds"
+    - "curl --http1.1 --request POST --form token=$WEBSITE_TOKEN --form ref=master --form \"variables[RELEASE_CI_BUILD_REF_NAME]=$CI_BUILD_REF_NAME\" --form \"variables[RELEASE_CI_BUILD_ID]=$CI_BUILD_ID\" https://gitlab.labs.nic.cz/api/v3/projects/5/trigger/builds"
   artifacts:
     name: "knot-dns-$CI_BUILD_REF_NAME-doc"
     paths: