diff --git a/misc/upload-pypi.py b/misc/upload-pypi.py
index be8da9e44f86..38c772cc5183 100644
--- a/misc/upload-pypi.py
+++ b/misc/upload-pypi.py
@@ -75,7 +75,7 @@ def check_sdist(dist: Path, version: str) -> None:
 
 
 def spot_check_dist(dist: Path, version: str) -> None:
-    items = [item for item in dist.iterdir() if is_whl_or_tar(item.name)]
+    items = [item for item in dist.iterdir() if is_whl_or_tar(item.name) and 'wasm' not in item.name]
     assert len(items) > 10
     assert all(version in item.name for item in items)
     assert any(item.name.endswith("py3-none-any.whl") for item in items)
@@ -93,7 +93,7 @@ def tmp_twine() -> Iterator[Path]:
 
 def upload_dist(dist: Path, dry_run: bool = True) -> None:
     with tmp_twine() as twine:
-        files = [item for item in dist.iterdir() if is_whl_or_tar(item.name)]
+        files = [item for item in dist.iterdir() if is_whl_or_tar(item.name) and 'wasm' not in item.name]
         cmd: list[Any] = [twine, "upload"]
         cmd += files
         if dry_run:
diff --git a/mypy/version.py b/mypy/version.py
index fa4e0c0cc58f..fe89c3e5e78d 100644
--- a/mypy/version.py
+++ b/mypy/version.py
@@ -8,7 +8,7 @@
 # - Release versions have the form "0.NNN".
 # - Dev versions have the form "0.NNN+dev" (PLUS sign to conform to PEP 440).
 # - For 1.0 we'll switch back to 1.2.3 form.
-__version__ = "0.990"
+__version__ = "0.991+dev"
 base_version = __version__
 
 mypy_dir = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))