diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index 4fa6f914..27da2721 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -1783,6 +1783,7 @@ class HttpCli(object):
                 open_ka["fun"] = gzip.GzipFile
                 open_a = ["wb", lv[alg], None, 0x5FEE6600]  # 2021-01-01
             elif alg == "xz":
+                assert lzma  # type: ignore  # !rm
                 open_ka = {"fun": lzma.open, "preset": lv[alg]}
                 open_a = ["wb"]
             else:
@@ -4128,6 +4129,8 @@ class HttpCli(object):
                 "dbwt": None,
             }
 
+        assert vstate and vs  # type: ignore  # !rm
+
         fmt = self.uparam.get("ls", "")
         if not fmt and (self.ua.startswith("curl/") or self.ua.startswith("fetch")):
             fmt = "v"
diff --git a/copyparty/httpconn.py b/copyparty/httpconn.py
index 09366742..1d76001e 100644
--- a/copyparty/httpconn.py
+++ b/copyparty/httpconn.py
@@ -162,6 +162,7 @@ class HttpConn(object):
 
             self.log_src = self.log_src.replace("[36m", "[35m")
             try:
+                assert ssl  # type: ignore  # !rm
                 ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
                 ctx.load_cert_chain(self.args.cert)
                 if self.args.ssl_ver:
diff --git a/copyparty/httpsrv.py b/copyparty/httpsrv.py
index bdec07c5..f89523fb 100644
--- a/copyparty/httpsrv.py
+++ b/copyparty/httpsrv.py
@@ -157,6 +157,7 @@ class HttpSrv(object):
         self.u2idx_free: dict[str, U2idx] = {}
         self.u2idx_n = 0
 
+        assert jinja2  # type: ignore  # !rm
         env = jinja2.Environment()
         env.loader = jinja2.FunctionLoader(lambda f: load_jinja2_resource(self.E, f))
         jn = [
diff --git a/copyparty/u2idx.py b/copyparty/u2idx.py
index 483e4e6e..c65ffab2 100644
--- a/copyparty/u2idx.py
+++ b/copyparty/u2idx.py
@@ -53,6 +53,8 @@ class U2idx(object):
             self.log("your python does not have sqlite3; searching will be disabled")
             return
 
+        assert sqlite3  # type: ignore  # !rm
+
         self.active_id = ""
         self.active_cur: Optional["sqlite3.Cursor"] = None
         self.cur: dict[str, "sqlite3.Cursor"] = {}
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index 7d5c6e62..0f87b4e8 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -176,6 +176,7 @@ class Up2k(object):
         self.spools: set[tempfile.SpooledTemporaryFile[bytes]] = set()
         if HAVE_SQLITE3:
             # mojibake detector
+            assert sqlite3  # type: ignore  # !rm
             self.mem_cur = self._orz(":memory:")
             self.mem_cur.execute(r"create table a (b text)")
             self.sqlite_ver = tuple([int(x) for x in sqlite3.sqlite_version.split(".")])
@@ -2477,6 +2478,7 @@ class Up2k(object):
             raise Exception("%s\n%s\n%s" % (t, txt, t))
 
     def _orz(self, db_path: str) -> "sqlite3.Cursor":
+        assert sqlite3  # type: ignore  # !rm
         c = sqlite3.connect(
             db_path, timeout=self.timeout, check_same_thread=False
         ).cursor()
@@ -2539,6 +2541,7 @@ class Up2k(object):
     def _backup_db(
         self, db_path: str, cur: "sqlite3.Cursor", ver: Optional[int], msg: str
     ) -> "sqlite3.Cursor":
+        assert sqlite3  # type: ignore  # !rm
         bak = "{}.bak.{:x}.v{}".format(db_path, int(time.time()), ver)
         self.log(msg + bak)
         try:
diff --git a/copyparty/util.py b/copyparty/util.py
index aa00d693..08f78a66 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -134,7 +134,7 @@ if True:  # pylint: disable=using-constant-test
     from collections.abc import Callable, Iterable
 
     import typing
-    from typing import Any, Generator, IO, Optional, Pattern, Protocol, Union
+    from typing import IO, Any, Generator, Optional, Pattern, Protocol, Union
 
     try:
         from typing import LiteralString