diff --git a/conf/app.src b/conf/app.src
index 2b99bd0..3553922 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://api.github.com/repos/TryGhost/Ghost/zipball/v5.2.4
-SOURCE_SUM=04ba64fd6f7ecb0ba0970eb63189b5b5780095260bce5d4edd2b50e25d0a316b
+SOURCE_URL=https://api.github.com/repos/TryGhost/Ghost/zipball/v5.8.3
+SOURCE_SUM=557c39864483fff00beeb60e27d84915e184845c69db3be83dcd7a65f327d497
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=true
diff --git a/conf/casper.src b/conf/casper.src
index 7ca2b10..d635bb2 100644
--- a/conf/casper.src
+++ b/conf/casper.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/TryGhost/Casper/archive/refs/tags/v5.1.5.zip
-SOURCE_SUM=ad883bf9e3ded051b21e4f2473cbcf32bdacdd8258f29bc45c4fdc0e3fc3e57f
+SOURCE_URL=https://github.com/TryGhost/Casper/archive/refs/tags/v5.2.3.zip
+SOURCE_SUM=49d57ce078a2775f39d019ed74fa4ae9476e95fa35b02593c726c0ea25fe49df
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=true
diff --git a/conf/systemd.service b/conf/systemd.service
index 38c6c70..a0e74da 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -9,7 +9,8 @@ Group=__APP__
 WorkingDirectory=__FINALPATH__
 Environment="__YNH_NODE_LOAD_PATH__"
 Environment="NODE_ENV=production"
-ExecStart=__YNH_NODE__ index.js run
+#ExecStart=__YNH_NODE__ core/index.js run
+ExecStart=yarn start
 Restart=always
 
 # Sandboxing options to harden security
diff --git a/scripts/change_url b/scripts/change_url
index 6173e14..d7bfda0 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -124,9 +124,9 @@ fi
 #=================================================
 ynh_script_progression --message="Modifying a config file..."
 
-ynh_add_config --template="../conf/config.production.json" --destination="$final_path/config.production.json"
-chmod 400 "$final_path/config.production.json"
-chown $app:$app "$final_path/config.production.json"
+ynh_add_config --template="../conf/config.production.json" --destination="$final_path/ghost/core/config.production.json"
+chmod 400 "$final_path/ghost/core/config.production.json"
+chown $app:$app "$final_path/ghost/core/config.production.json"
 
 #=================================================
 # GENERIC FINALISATION
diff --git a/scripts/install b/scripts/install
index 945ee8b..d3eebf2 100644
--- a/scripts/install
+++ b/scripts/install
@@ -99,13 +99,9 @@ ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$final_path"
 
-# Download, check integrity, uncompress and patch the source from admin.src
-mkdir -p $final_path/core/client/Admin
-ynh_setup_source --dest_dir="$final_path/core/admin" --source_id="admin"
-
 # Download, check integrity, uncompress and patch the source from casper.src
-mkdir -p $final_path/content/themes/casper
-ynh_setup_source --dest_dir="$final_path/content/themes/casper" --source_id="casper"
+mkdir -p $final_path/ghost/core/content/themes/casper
+ynh_setup_source --dest_dir="$final_path/ghost/core/content/themes/casper" --source_id="casper"
 
 chmod 750 "$final_path"
 chmod -R o-rwx "$final_path"
@@ -126,9 +122,9 @@ ynh_add_nginx_config
 #=================================================
 ynh_script_progression --message="Modifying a config file..."
 
-ynh_add_config --template="../conf/config.production.json" --destination="$final_path/config.production.json"
-chmod 400 "$final_path/config.production.json"
-chown $app:$app "$final_path/config.production.json"
+ynh_add_config --template="../conf/config.production.json" --destination="$final_path/ghost/core/config.production.json"
+chmod 400 "$final_path/ghost/core/config.production.json"
+chown $app:$app "$final_path/ghost/core/config.production.json"
 
 #==============================================
 # BUILD GHOST
@@ -137,11 +133,8 @@ ynh_script_progression --message="Building Ghost... (this will take some time an
 
 pushd "$final_path"
 	ynh_use_nodejs
-	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn install --non-interactive
-	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn add knex-migrator
-	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/knex-migrator init
-	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/grunt symlink
-	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/grunt init --force
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn add knex-migrator ember-cli --dev --ignore-workspace-root-check --non-interactive
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn setup # catch-all command provided by Ghost that handles all the setup
 popd
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 395cb71..d0cde84 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -92,10 +92,24 @@ then
 	tmpdir="$(mktemp -d)"
 
 	# Copy the admin saved settings from final path to tmp directory
-	cp -ar "$final_path/config.production.json" "$tmpdir/config.production.json"
+	if [ -d "$final_path/config.production.json" ]
+	then
+		# Old versions of Ghost store it here
+		cp -ar "$final_path/config.production.json" "$tmpdir/config.production.json"
+	else
+		# New versions of Ghost store it here
+		cp -ar "$final_path/ghost/core/config.production.json" "$tmpdir/config.production.json"
+	fi
 
 	# Backup the content folder to the temp dir
-	cp -ar "$final_path/content" "$tmpdir/content"
+	if [ -d "$final_path/config.production.json" ]
+	then
+		# Old versions of Ghost store it here
+		cp -ar "$final_path/content" "$tmpdir/content"
+	else
+		# New versions of Ghost store it here
+		cp -ar "$final_path/ghost/core/content" "$tmpdir/content"
+	fi
 
 	# Remove the app directory securely
 	ynh_secure_remove --file=$final_path
@@ -103,19 +117,15 @@ then
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir=$final_path
 
-	# Download, check integrity, uncompress and patch the source from admin.src
-	mkdir -p $final_path/core/client/Admin
-	ynh_setup_source --dest_dir="$final_path/core/admin" --source_id="admin"
-
 	# Download, check integrity, uncompress and patch the source from casper.src
 	mkdir -p $final_path/content/themes/casper
-	ynh_setup_source --dest_dir="$final_path/content/themes/casper" --source_id="casper"
+	ynh_setup_source --dest_dir="$final_path/ghost/core/content/themes/casper" --source_id="casper"
 
 	# Copy the admin saved settings from tmp directory to final path
-	cp -ar "$tmpdir/config.production.json" "$final_path/config.production.json"
+	cp -ar "$tmpdir/config.production.json" "$final_path/ghost/core/config.production.json"
 
 	# Copy content folder back to the final_path
-	cp -ar "$tmpdir/content" "${final_path}"
+	cp -ar "$tmpdir/content" "${final_path}/ghost/core"
 
 	# Remove the tmp directory securely
 	ynh_secure_remove --file="$tmpdir"
@@ -153,9 +163,9 @@ ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ st
 #=================================================
 ynh_script_progression --message="Modifying a config file..."
 
-ynh_add_config --template="../conf/config.production.json" --destination="$final_path/config.production.json"
-chmod 400 "$final_path/config.production.json"
-chown $app:$app "$final_path/config.production.json"
+ynh_add_config --template="../conf/config.production.json" --destination="$final_path/ghost/core/config.production.json"
+chmod 400 "$final_path/ghost/core/config.production.json"
+chown $app:$app "$final_path/ghost/core/config.production.json"
 
 #==============================================
 # BUILD GHOST
@@ -167,10 +177,8 @@ then
 
 	pushd "$final_path"
 		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn install --non-interactive
-		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn add knex-migrator
-		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/knex-migrator init
-		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/grunt symlink
-		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $final_path/node_modules/.bin/grunt init --force
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn add knex-migrator ember-cli --dev --ignore-workspace-root-check --non-interactive
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH yarn setup
 	popd
 fi