diff --git a/pypi/setup.py b/pypi/setup.py
index b76723b..6cebe77 100644
--- a/pypi/setup.py
+++ b/pypi/setup.py
@@ -37,7 +37,7 @@ def long_description():
     install_requires=[
         "importlib_resources; python_version<'3.9'",
         "appdirs~=1.4",
-        "wasmtime>=0.28,<0.29"
+        "wasmtime>=0.30,<0.31"
     ],
     packages=["yowasp_yosys"],
     package_data={"yowasp_yosys": [
diff --git a/pypi/yowasp_yosys/__init__.py b/pypi/yowasp_yosys/__init__.py
index e1a3f50..95a81a2 100644
--- a/pypi/yowasp_yosys/__init__.py
+++ b/pypi/yowasp_yosys/__init__.py
@@ -44,8 +44,7 @@ def _run_wasm_app(wasm_filename, argv):
         with digest_filename.open("rb") as digest_file:
             if digest_file.read() != module_digest:
                 raise Exception("cache miss")
-        with cache_filename.open("rb") as cache_file:
-            module = wasmtime.Module.deserialize(engine, cache_file.read())
+        module = wasmtime.Module.deserialize_file(engine, str(cache_filename))
     except:
         print("Preparing to run {}. This might take a while...".format(argv[0]), file=sys.stderr)
         module = wasmtime.Module(engine, module_binary)