diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 73fe44510440f98f95382f3ef0999f33a7b33ba7..6543ea06625302b926628cca52664dab1c510d96 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,8 +1,6 @@
-default:
-    image: julia:1.5.3
-
 build-doc:
     stage: build
+    image: julia:1.6
     script:
         - "julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'"
         - "julia --project=docs/ docs/make.jl"