diff --git a/scripts/_common.sh b/scripts/_common.sh
index 4aeb6e7..8f6e28d 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -5,7 +5,7 @@
 #=================================================
 
 # dependencies used by the app
-pkg_dependencies="apt-transport-https libssl-dev libxml2-dev libyaml-dev libgmp-dev libreadline-dev postgresql librsvg2-bin libsqlite3-dev zlib1g-dev" #crystal
+pkg_dependencies="crystal apt-transport-https libssl-dev libxml2-dev libyaml-dev libgmp-dev libreadline-dev postgresql librsvg2-bin libsqlite3-dev zlib1g-dev"
 
 #=================================================
 # PERSONAL HELPERS
diff --git a/scripts/install b/scripts/install
index 795cf3e..ac08506 100644
--- a/scripts/install
+++ b/scripts/install
@@ -66,10 +66,10 @@ ynh_app_setting_set --app=$app --key=port --value=$port
 #=================================================
 ynh_script_progression --message="Installing dependencies..." --weight=9
 
-#ynh_exec_warn_less apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 379CE192D401AB61
-#ynh_install_extra_repo --repo="deb https://dl.bintray.com/crystal/deb all stable" --append
+ynh_exec_warn_less apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 379CE192D401AB61
+ynh_install_extra_repo --repo="deb https://dl.bintray.com/crystal/deb all stable" --append
 
-ynh_exec_warn_less curl -fsSL https://crystal-lang.org/install.sh | bash -s -- --crystal=0.36
+#ynh_exec_warn_less curl -fsSL https://crystal-lang.org/install.sh | bash -s -- --crystal=0.36
 
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 3142ee5..c2efe68 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -72,10 +72,10 @@ ynh_systemd_action --service_name=$app --action=stop --log_path=systemd
 #=================================================
 ynh_script_progression --message="Upgrading dependencies..." --weight=8
 
-#ynh_exec_warn_less apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 379CE192D401AB61
-#ynh_install_extra_repo --repo="deb https://dl.bintray.com/crystal/deb all stable" --append
+ynh_exec_warn_less apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 379CE192D401AB61
+ynh_install_extra_repo --repo="deb https://dl.bintray.com/crystal/deb all stable" --append
 
-ynh_exec_warn_less curl -fsSL https://crystal-lang.org/install.sh | bash -s -- --crystal=0.36
+#ynh_exec_warn_less curl -fsSL https://crystal-lang.org/install.sh | bash -s -- --crystal=0.36
 
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies