diff --git a/.github/workflows/updater.sh b/.github/workflows/updater.sh
index fad26c3..8e449f7 100644
--- a/.github/workflows/updater.sh
+++ b/.github/workflows/updater.sh
@@ -14,14 +14,24 @@
 #=================================================
 
 # Fetching information
-current_version=$(cat manifest.json | jq -j '.version|split("~")[0]')
-repo=$(cat manifest.json | jq -j '.upstream.code|split("https://github.com/")[1]')
 # Some jq magic is needed, because the latest upstream release is not always the latest version (e.g. security patches for older versions)
-version=$(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '.[] | select( .prerelease != true ) | .tag_name' | sort -V | tail -1)
-assets=($(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '[ .[] | select(.tag_name=="'$version'").assets[].browser_download_url ] | join(" ") | @sh' | tr -d "'"))
 
+current_version=$(cat manifest.json | jq -j '.version|split("~")[0]')
+
+# CORE
+# repo=$(cat manifest.json | jq -j '.upstream.code|split("https://github.com/")[1]')
+repo="TryGhost/Ghost"
+version=$(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '.[] | select( .prerelease != true ) | .tag_name' | sort -V | tail -1)
+assets=($(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '[ .[] | select(.tag_name=="'$version'").zipball_url ] | join(" ") | @sh' | tr -d "'"))
+
+# ADMIN
 admin_repo="TryGhost/Admin"
-assets+=("https://github.com/TryGhost/Admin/archive/refs/tags/${version}.zip")
+assets+=("https://github.com/$admin_repo/archive/refs/tags/${version}.zip")
+
+# THEME
+theme_repo="TryGhost/Casper"
+theme_version=$(curl --silent "https://api.github.com/repos/$theme_repo/releases" | jq -r '.[] | select( .prerelease != true ) | .tag_name' | sort -V | tail -1)
+assets+=("https://github.com/$theme_repo/archive/refs/tags/${theme_version}.zip")
 
 # Later down the script, we assume the version has only digits and dots
 # Sometimes the release name starts with a "v", so let's filter it out.
@@ -67,12 +77,15 @@ echo "Handling asset at $asset_url"
 # Here we base the source file name upon a unique keyword in the assets url (admin vs. update)
 # Leave $src empty to ignore the asset
 case $asset_url in
-  *"Ghost-"*".zip")
+  *"/Ghost/"*)
     src="app"
     ;;
   *"/Admin/"*)
     src="admin"
     ;;
+  *"/Casper/"*)
+    src="casper"
+    ;;
   *)
     src=""
     ;;
@@ -92,20 +105,13 @@ checksum=$(sha256sum "$tempdir/$filename" | head -c 64)
 # Delete temporary directory
 rm -rf $tempdir
 
-# Get extension
-if [[ $filename == *.tar.gz ]]; then
-  extension=tar.gz
-else
-  extension=${filename##*.}
-fi
-
 # Rewrite source file
 cat <<EOT > conf/$src.src
 SOURCE_URL=$asset_url
 SOURCE_SUM=$checksum
 SOURCE_SUM_PRG=sha256sum
-SOURCE_FORMAT=$extension
-SOURCE_IN_SUBDIR=false
+SOURCE_FORMAT=zip
+SOURCE_IN_SUBDIR=true
 EOT
 echo "... conf/$src.src updated"
 
@@ -117,8 +123,8 @@ fi
 
 done
 
-if [ $count == 0 ]; then
-    echo "::warning ::None of the assets were processed."
+if [ $count -lt 2 ]; then
+    echo "::warning ::Some assets were not processed."
     exit 0
 fi
 
@@ -141,4 +147,3 @@ echo "$(jq -s --indent 4 ".[] | .version = \"$version~ynh1\"" manifest.json)" >
 # The Action will proceed only if the PROCEED environment variable is set to true
 echo "PROCEED=true" >> $GITHUB_ENV
 exit 0
-
diff --git a/README.md b/README.md
index 37cb059..829c056 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,8 @@ If you don't have YunoHost, please consult [the guide](https://yunohost.org/#/in
 
 Publishing, memberships, subscriptions and newsletters platform
 
-**Shipped version:** 5.2.2~ynh1
+**Shipped version:** 5.8.3~ynh1
+
 
 ## Screenshots
 
diff --git a/README_fr.md b/README_fr.md
index 0ce2198..66d2e59 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -17,7 +17,8 @@ Si vous n'avez pas YunoHost, regardez [ici](https://yunohost.org/#/install) pour
 
 Plateforme d'édition, d'adhésions, d'abonnements et de newsletters
 
-**Version incluse :** 5.2.2~ynh1
+**Version incluse :** 5.8.3~ynh1
+
 
 ## Captures d'écran
 
diff --git a/conf/admin.src b/conf/admin.src
deleted file mode 100644
index e34aa75..0000000
--- a/conf/admin.src
+++ /dev/null
@@ -1,5 +0,0 @@
-SOURCE_URL=https://github.com/TryGhost/Admin/archive/refs/tags/v5.2.2.zip
-SOURCE_SUM=20f1aea329107ad1ef9c128b6727a73316a2ff3dfdf5f143735506d6a988d249
-SOURCE_SUM_PRG=sha256sum
-SOURCE_FORMAT=zip
-SOURCE_IN_SUBDIR=false
diff --git a/conf/app.src b/conf/app.src
index 9164fd2..3553922 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/TryGhost/Ghost/releases/download/v4.40.0/Ghost-4.40.0.zip
-SOURCE_SUM=c0ad20deb45984e70211f50e31271c9a204cc7eba3f9488a115d3f6bcc0fe3d7
+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=false
+SOURCE_IN_SUBDIR=true
diff --git a/conf/casper.src b/conf/casper.src
new file mode 100644
index 0000000..d635bb2
--- /dev/null
+++ b/conf/casper.src
@@ -0,0 +1,5 @@
+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/manifest.json b/manifest.json
index ec6a20e..7af56e1 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,13 +6,14 @@
         "en": "Publishing, memberships, subscriptions and newsletters platform",
         "fr": "Plateforme d'édition, d'adhésions, d'abonnements et de newsletters"
     },
-    "version": "5.2.2~ynh1",
+    "version": "5.8.3~ynh1",
     "url": "https://ghost.org/",
     "upstream": {
         "license": "MIT",
         "website": "https://ghost.org/",
         "admindoc": "https://ghost.org/help/",
-        "code": "https://github.com/TryGhost/Ghost"
+        "code": "https://github.com/TryGhost/Ghost",
+        "cpe": "cpe:2.3:a:ghost:ghost"
     },
     "license": "MIT",
     "maintainer": {
@@ -50,4 +51,4 @@
             }
         ]
     }
-}
+}
\ No newline at end of file
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 0f7fd56..388008d 100644
--- a/scripts/install
+++ b/scripts/install
@@ -99,9 +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/client/Admin" --source_id="admin"
+# Download, check integrity, uncompress and patch the source from casper.src
+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"
@@ -122,9 +122,13 @@ 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 "$final_path/ghost/core/config.production.json"
+
+touch "$final_path/.yarnrc.yml"
+chmod 400 "$final_path/.yarnrc.yml"
+chown $app:$app "$final_path/.yarnrc.yml"
 
 #==============================================
 # BUILD GHOST
@@ -133,10 +137,10 @@ 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 $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
+	# Longer network timeouts for slow systems; see https://github.com/yarnpkg/yarn/issues/8242
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn config set network-timeout 600000
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn add knex-migrator ember-cli --dev --ignore-workspace-root-check --non-interactive
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn setup # catch-all command provided by Ghost that handles all the setup
 popd
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 304bc31..d3a2b7c 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 [ -f "$final_path/config.production.json" ]
+	then
+		# Old versions of Ghost store it here
+		cp -ar "$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 [ -f "$final_path/config.production.json" ]
+	then
+		# Old versions of Ghost store it here
+		cp -ar "$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=$final_path
@@ -103,15 +117,15 @@ then
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir=$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/client/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/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"
@@ -149,9 +163,13 @@ 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 "$final_path/ghost/core/config.production.json"
+
+touch "$final_path/.yarnrc.yml"
+chmod 400 "$final_path/.yarnrc.yml"
+chown $app:$app "$final_path/.yarnrc.yml"
 
 #==============================================
 # BUILD GHOST
@@ -162,10 +180,11 @@ then
 	ynh_script_progression --message="Building Ghost... (this will take some time and resources!)"
 
 	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 $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
+		# Longer network timeouts for slow systems; see https://github.com/yarnpkg/yarn/issues/8242
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn config set network-timeout 600000
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn install --non-interactive
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn add knex-migrator ember-cli --dev --ignore-workspace-root-check --non-interactive
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH HOME="$final_path" yarn setup
 	popd
 fi