diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 081b8db..812b0a9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,6 +6,8 @@ stages:
 
 build-html:
   stage: build
+  before_script:
+    cask install
   script:
     make html
   artifacts:
diff --git a/Cask b/Cask
new file mode 100644
index 0000000..eccb27c
--- /dev/null
+++ b/Cask
@@ -0,0 +1,5 @@
+(source gnu)
+(source melpa)
+(source org)
+
+(depends-on "org-plus-contrib")
diff --git a/GNUmakefile b/GNUmakefile
index ff308af..b20b224 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -7,7 +7,7 @@ html: public_html/index.html
 css: public_html/assets/css/main.css
 
 public_html/%.html: %.org
-	emacs -batch \
+	cask emacs -batch \
 	    -funcall package-initialize \
 	    -load project-config.el \
 	    -funcall publish-ryuslash.org