diff --git a/aqt/metadata.py b/aqt/metadata.py
index 11c9ec0..1321127 100644
--- a/aqt/metadata.py
+++ b/aqt/metadata.py
@@ -246,6 +246,8 @@ class ArchiveId:
     def all_extensions(self, version: Version) -> List[str]:
         if self.target == "desktop" and QtRepoProperty.is_in_wasm_range(self.host, version):
             return ["", "wasm"]
+        elif self.target == "desktop" and QtRepoProperty.is_in_wasm_threaded_range(version):
+            return ["", "wasm_singlethread", "wasm_multithread"]
         elif self.target == "android" and version >= Version("6.0.0"):
             return list(ArchiveId.EXTENSIONS_REQUIRED_ANDROID_QT6)
         else:
@@ -400,6 +402,10 @@ class QtRepoProperty:
     def extension_for_arch(architecture: str, is_version_ge_6: bool) -> str:
         if architecture == "wasm_32":
             return "wasm"
+        elif architecture == "wasm_singlethread":
+            return "wasm_singlethread"
+        elif architecture == "wasm_multithread":
+            return "wasm_multithread"
         elif architecture.startswith("android_") and is_version_ge_6:
             ext = architecture[len("android_") :]
             if ext in ArchiveId.EXTENSIONS_REQUIRED_ANDROID_QT6:
@@ -483,11 +489,15 @@ class QtRepoProperty:
     @staticmethod
     def is_in_wasm_range(host: str, version: Version) -> bool:
         return (
-            version in SimpleSpec(">=6.2.0")
+            version in SimpleSpec(">=6.2.0,<6.5.0")
             or (host == "linux" and version in SimpleSpec(">=5.13,<6"))
             or version in SimpleSpec(">=5.13.1,<6")
         )
 
+    @staticmethod
+    def is_in_wasm_threaded_range(version: Version) -> bool:
+        return version in SimpleSpec(">=6.5.0")
+
 
 class MetadataFactory:
     """Retrieve metadata of Qt variations, versions, and descriptions from Qt site."""
diff --git a/aqt/updater.py b/aqt/updater.py
index 4ccf3dc..1de647f 100644
--- a/aqt/updater.py
+++ b/aqt/updater.py
@@ -282,6 +282,8 @@ class Updater:
                 "ios",
                 "android",
                 "wasm_32",
+                "wasm_singlethread",
+                "wasm_multithread",
                 "android_x86_64",
                 "android_arm64_v8a",
                 "android_x86",