diff --git a/.github/actions/merge/entrypoint.py b/.github/actions/merge/entrypoint.py
index 71de188..79192ae 100755
--- a/.github/actions/merge/entrypoint.py
+++ b/.github/actions/merge/entrypoint.py
@@ -9,12 +9,16 @@ import sys
 import tempfile
 import time
 
+import gi
 import github
 import pygit2
 import yaml
 from gql import Client, gql
 from gql.transport.requests import RequestsHTTPTransport
 
+gi.require_version("Json", "1.0")
+from gi.repository import Json
+
 
 def set_protected_branch(token, repo, branch):
     transport = RequestsHTTPTransport(
@@ -74,6 +78,7 @@ def set_protected_branch(token, repo, branch):
 def detect_appid(dirname):
     files = []
     ret = (None, None)
+    appid = None
 
     for ext in ("yml", "yaml", "json"):
         files.extend(glob.glob(f"{dirname}/*.{ext}"))
@@ -86,32 +91,26 @@ def detect_appid(dirname):
             with open(filename) as f:
                 if ext in ("yml", "yaml"):
                     manifest = yaml.safe_load(f)
+                    if "app-id" in manifest:
+                        appid = manifest["app-id"]
+                    elif "id" in manifest:
+                        appid = manifest["id"]
                 else:
-                    result = subprocess.run(
-                        ["flatpak-builder", "--show-manifest", filename],
-                        stdout=subprocess.PIPE,
-                    )
-                    if result.returncode == 0:
-                        manifest = json.loads(result.stdout.decode("utf-8"))
-                    else:
-                        print(
-                            "flatpak-builder failed to print manifest, falling back to json Python module"
-                        )
-                        try:
-                            with open(filename) as f:
-                                manifest = json.load(f)
-                        except json.decoder.JSONDecodeError:
-                            ("Manifest is not a valid JSON")
-                            break
+                    parser = Json.Parser()
+                    if parser.load_from_file(parser, filename):
+                        root_node = parser.get_root()
+                        if root_node.get_node_type() == Json.NodeType.OBJECT:
+                            json_object = root_node.get_object()
+                            if json_object.has_member("id"):
+                                appid = json_object.get_string_member("id")
+                            elif json_object.has_member("app-id"):
+                                appid = json_object.get_string_member("app-id")
 
-            if manifest:
+            if not appid:
+                continue
+
+            if appid:
                 manifest_file = os.path.basename(filename)
-                if "app-id" in manifest:
-                    appid = manifest["app-id"]
-                elif "id" in manifest:
-                    appid = manifest["id"]
-                else:
-                    continue
                 if os.path.splitext(manifest_file)[0] != appid:
                     print(f"Skipping {manifest_file}, does not match appid {appid}")
                     continue