diff --git a/pyodide-build/pyodide_build/buildall.py b/pyodide-build/pyodide_build/buildall.py
index d4c08193a..60ca6b2a6 100755
--- a/pyodide-build/pyodide_build/buildall.py
+++ b/pyodide-build/pyodide_build/buildall.py
@@ -457,9 +457,16 @@ def generate_packages_json(
     output_dir: Path, pkg_map: dict[str, BasePackage]
 ) -> dict[str, dict[str, Any]]:
     """Generate the package.json file"""
+
+    import sys
+
+    sys.path.append(str(common.get_pyodide_root() / "src/py"))
+    from pyodide import __version__
+
     # Build package.json data.
+    [platform, _, arch] = common.platform().rpartition("_")
     package_data: dict[str, dict[str, Any]] = {
-        "info": {"arch": "wasm32", "platform": "Emscripten-1.0"},
+        "info": {"arch": arch, "platform": platform, "version": __version__},
         "packages": {},
     }
 
diff --git a/pyodide-build/pyodide_build/tests/test_buildall.py b/pyodide-build/pyodide_build/tests/test_buildall.py
index 947d52862..6767aa763 100644
--- a/pyodide-build/pyodide_build/tests/test_buildall.py
+++ b/pyodide-build/pyodide_build/tests/test_buildall.py
@@ -33,7 +33,10 @@ def test_generate_packages_json(tmp_path):
 
     package_data = buildall.generate_packages_json(tmp_path, pkg_map)
     assert set(package_data.keys()) == {"info", "packages"}
-    assert package_data["info"] == {"arch": "wasm32", "platform": "Emscripten-1.0"}
+    assert set(package_data["info"].keys()) == {"arch", "platform", "version"}
+    assert package_data["info"]["arch"] == "wasm32"
+    assert package_data["info"]["platform"].startswith("emscripten")
+
     assert set(package_data["packages"]) == {
         "pkg_1",
         "pkg_1_1",