diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 78ed96c43b5c789bce1d89d15bca9f51d1047df3..261deaf804617540db57240514aa13beee33058e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 make:
-    image: tk0miya/sphinx-html
+    image: sphinxdoc/sphinx
     script:
-        - pip install sphinx-rtd-theme
+        - pip3 install sphinx-rtd-theme
         - cd doc
         - make html
         - eval $(ssh-agent)