diff --git a/bypy/linux/__main__.py b/bypy/linux/__main__.py
index 1d14ecf326..0662a3fb49 100644
--- a/bypy/linux/__main__.py
+++ b/bypy/linux/__main__.py
@@ -13,13 +13,14 @@ import time
 from functools import partial
 
 from bypy.constants import (
-    OUTPUT_DIR, PREFIX, SRC as CALIBRE_DIR, python_major_minor_version
+    OUTPUT_DIR, PREFIX, SRC as CALIBRE_DIR, python_major_minor_version,
 )
 from bypy.freeze import (
-    extract_extension_modules, fix_pycryptodome, freeze_python, path_to_freeze_dir
+    extract_extension_modules, fix_pycryptodome, freeze_python, is_package_dir,
+    path_to_freeze_dir,
 )
 from bypy.utils import (
-    create_job, get_dll_path, mkdtemp, parallel_build, py_compile, run, walk
+    create_job, get_dll_path, mkdtemp, parallel_build, py_compile, run, walk,
 )
 
 j = os.path.join
@@ -90,9 +91,8 @@ def ignore_in_lib(base, items, ignored_dirs=None):
     for name in items:
         path = j(base, name)
         if os.path.isdir(path):
-            if name in ignored_dirs or not os.path.exists(j(path, '__init__.py')):
-                if name != 'plugins':
-                    ans.append(name)
+            if name != 'plugins' and (name in ignored_dirs or not is_package_dir(path)):
+                ans.append(name)
         else:
             if name.rpartition('.')[-1] not in ('so', 'py'):
                 ans.append(name)
@@ -112,7 +112,7 @@ def import_site_packages(srcdir, dest):
                 src = os.path.abspath(j(srcdir, line))
                 if os.path.exists(src) and os.path.isdir(src):
                     import_site_packages(src, dest)
-        elif os.path.exists(j(f, '__init__.py')):
+        elif is_package_dir(f):
             shutil.copytree(f, j(dest, x), ignore=ignore_in_lib)
 
 
diff --git a/bypy/macos/__main__.py b/bypy/macos/__main__.py
index 2058af9450..125dc3957c 100644
--- a/bypy/macos/__main__.py
+++ b/bypy/macos/__main__.py
@@ -20,13 +20,14 @@ from functools import partial, reduce
 from itertools import repeat
 
 from bypy.constants import (
-    OUTPUT_DIR, PREFIX, PYTHON, SRC as CALIBRE_DIR, python_major_minor_version
+    OUTPUT_DIR, PREFIX, PYTHON, SRC as CALIBRE_DIR, python_major_minor_version,
 )
 from bypy.freeze import (
-    extract_extension_modules, fix_pycryptodome, freeze_python, path_to_freeze_dir
+    extract_extension_modules, fix_pycryptodome, freeze_python, is_package_dir,
+    path_to_freeze_dir,
 )
 from bypy.utils import (
-    current_dir, get_arches_in_binary, mkdtemp, py_compile, timeit, walk
+    current_dir, get_arches_in_binary, mkdtemp, py_compile, timeit, walk,
 )
 
 abspath, join, basename, dirname = os.path.abspath, os.path.join, os.path.basename, os.path.dirname
@@ -584,7 +585,7 @@ class Freeze:
     def add_packages_from_dir(self, src):
         for x in os.listdir(src):
             x = join(src, x)
-            if os.path.isdir(x) and os.path.exists(join(x, '__init__.py')):
+            if os.path.isdir(x) and is_package_dir(x):
                 if self.filter_package(basename(x)):
                     continue
                 self.add_package_dir(x)
diff --git a/bypy/sources.json b/bypy/sources.json
index b779fdb80d..49ffce9727 100644
--- a/bypy/sources.json
+++ b/bypy/sources.json
@@ -767,9 +767,9 @@
     {
         "name": "apsw",
         "unix": {
-            "filename": "apsw-3.36.0-r1.zip",
-            "hash": "sha256:17355c39a8cdb9b9cd75b76d883b624c0dd05f80a6677c693b67c343c2381871",
-            "urls": ["https://github.com/rogerbinns/apsw/releases/download/3.36.0-r1/{filename}"]
+            "filename": "apsw-3.43.0.0.zip",
+            "hash": "sha256:7440d5f976a369ab87477e064545a8a62a93e413ead7bfe0be4efc75b1f30bb0",
+            "urls": ["https://github.com/rogerbinns/apsw/releases/download/3.43.0.0/{filename}"]
         }
     },