diff --git a/.gitignore b/.gitignore
index 0d6b022..428343e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@ docs/_build
 
 capnp/lib/capnp.cpp
 capnp/lib/capnp.h
+capnp/lib/capnp_api.h
 bundled/
 example
 *.iml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92e8d58..e0367e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## v2.0.0b1 (2023-10-03)
 - Update to bundled capnproto-1.0.1
-- Remove explicit support for Python 3.7 (though wheels are still built for now)
+- Remove support for Python 3.7
 - Use custom build backend to support build args (#328)
 - Update Cython version and Python to 3.12 (#320)
 - Wrap all capnp code in a context-manager to avoid segfaults (#317)
diff --git a/capnp/lib/capnp.pyx b/capnp/lib/capnp.pyx
index ff775a2..dbb92b7 100644
--- a/capnp/lib/capnp.pyx
+++ b/capnp/lib/capnp.pyx
@@ -42,6 +42,7 @@ from types import ModuleType as _ModuleType
 from operator import attrgetter as _attrgetter
 from functools import partial as _partial
 from contextlib import asynccontextmanager as _asynccontextmanager
+from importlib.machinery import ModuleSpec
 
 _CAPNP_VERSION_MAJOR = capnp.CAPNP_VERSION_MAJOR
 _CAPNP_VERSION_MINOR = capnp.CAPNP_VERSION_MINOR
@@ -2423,7 +2424,7 @@ cdef class _PyAsyncIoStreamProtocol(DummyBaseClass, asyncio.BufferedProtocol):
 
     # State for reading data from the transport
     cdef char* read_buffer
-    cdef size_t read_min_bytes
+    cdef int32_t read_min_bytes
     cdef size_t read_max_bytes
     cdef size_t read_already_read
     cdef PromiseFulfiller[size_t]* read_fulfiller
@@ -4322,7 +4323,7 @@ class _Importer:
         self.extension = '.capnp'
         self.additional_paths = additional_paths
 
-    def find_module(self, fullname, package_path=None):
+    def find_spec(self, fullname, package_path, target=None):
         if fullname in _sys.modules: # Don't allow re-imports
             return None
 
@@ -4363,12 +4364,12 @@ class _Importer:
                 path = abspath(path)
 
             if is_file(path+sep+capnp_module_name):
-                return _Loader(fullname, join_path(path, capnp_module_name), self.additional_paths)
+                return ModuleSpec(fullname, _Loader(fullname, join_path(path, capnp_module_name), self.additional_paths))
             if has_underscores:
                 if is_file(path+sep+capnp_module_name_dashes):
-                    return _Loader(fullname, join_path(path, capnp_module_name_dashes), self.additional_paths)
+                    return ModuleSpec(fullname, _Loader(fullname, join_path(path, capnp_module_name_dashes), self.additional_paths))
                 if is_file(path+sep+capnp_module_name_spaces):
-                    return _Loader(fullname, join_path(path, capnp_module_name_spaces), self.additional_paths)
+                    return ModuleSpec(fullname, _Loader(fullname, join_path(path, capnp_module_name_spaces), self.additional_paths))
 
 
 _importer = None
diff --git a/setup.py b/setup.py
index b263a96..31e7781 100644
--- a/setup.py
+++ b/setup.py
@@ -210,7 +210,7 @@ def run(self):  # noqa: C901
 ]
 
 setup(
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     name="pycapnp",
     packages=["capnp"],
     version=VERSION,
diff --git a/test/test_load.py b/test/test_load.py
index 0fde0c9..34b2830 100644
--- a/test/test_load.py
+++ b/test/test_load.py
@@ -144,6 +144,7 @@ async def wrapped(self, object, **kwargs):
     baz_.text = "test"
     baz_.qux.id = 2
 
-    wrapper = foo.Wrapper._new_client(Wrapper())
-    remote = wrapper.wrapped(baz_)
-    await remote
+    async with capnp.kj_loop():
+        wrapper = foo.Wrapper._new_client(Wrapper())
+        remote = wrapper.wrapped(baz_)
+        await remote