diff --git a/CHANGELOG.md b/CHANGELOG.md
index 190b604cb..6cecf7f73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,9 @@ If you depend on these features, please raise your voice in
 * Remove all deprecated pathod and pathoc tools and modules (@Kriechi)
 * In reverse proxy mode, mitmproxy now does not assume TLS if no scheme
   is given but a custom port is provided (@mhils)
+* Remove the following options: `http2_priority`, `relax_http_form_validation`, `upstream_bind_address`,
+  `spoof_source_address`, and `stream_websockets`. If you depended on one of them please let us know. 
+  mitmproxy never phones home, which means we don't know how prominently these options were used. (@mhils)
 * --- TODO: add new PRs above this line ---
 * ... and various other fixes, documentation improvements, dependency version bumps, etc.
 
diff --git a/mitmproxy/addons/core.py b/mitmproxy/addons/core.py
index 6aa5856db..2034947aa 100644
--- a/mitmproxy/addons/core.py
+++ b/mitmproxy/addons/core.py
@@ -42,6 +42,10 @@ class Core:
                 "add_upstream_certs_to_client_chain requires the upstream_cert option to be enabled."
             )
         if "body_size_limit" in updated:
+            if opts.body_size_limit:  # pragma: no cover
+                ctx.log.warn(
+                    "body_size_limit is currently nonfunctioning, "
+                    "see https://github.com/mitmproxy/mitmproxy/issues/4348")
             try:
                 human.parse_size(opts.body_size_limit)
             except ValueError:
diff --git a/mitmproxy/addons/streambodies.py b/mitmproxy/addons/streambodies.py
index c568e944c..e0cd8d7a3 100644
--- a/mitmproxy/addons/streambodies.py
+++ b/mitmproxy/addons/streambodies.py
@@ -19,13 +19,6 @@ class StreamBodies:
             Understands k/m/g suffixes, i.e. 3m for 3 megabytes.
             """
         )
-        loader.add_option(
-            "stream_websockets", bool, False,
-            """
-            Stream WebSocket messages between client and server.
-            Messages are captured and cannot be modified.
-            """
-        )
 
     def configure(self, updated):
         if "stream_large_bodies" in updated and ctx.options.stream_large_bodies:
@@ -54,11 +47,3 @@ class StreamBodies:
 
     def responseheaders(self, f):
         self.run(f, False)
-
-    def websocket_start(self, f):
-        if ctx.options.stream_websockets:
-            f.stream = True
-            ctx.log.info("Streaming WebSocket messages between {client} and {server}".format(
-                client=human.format_address(f.client_conn.peername),
-                server=human.format_address(f.server_conn.address))
-            )
diff --git a/mitmproxy/addons/upstream_auth.py b/mitmproxy/addons/upstream_auth.py
index c0581e27c..dc1a64419 100644
--- a/mitmproxy/addons/upstream_auth.py
+++ b/mitmproxy/addons/upstream_auth.py
@@ -47,6 +47,9 @@ class UpstreamAuth():
             if ctx.options.upstream_auth is None:
                 self.auth = None
             else:
+                if ctx.options.upstream_auth:  # pragma: no cover
+                    ctx.log.warn("upstream_auth is currently nonfunctioning, "
+                                 "see https://github.com/mitmproxy/mitmproxy/issues/4348")
                 self.auth = parse_upstream_auth(ctx.options.upstream_auth)
 
     def http_connect(self, f):
diff --git a/mitmproxy/options.py b/mitmproxy/options.py
index a047358bb..b480045ec 100644
--- a/mitmproxy/options.py
+++ b/mitmproxy/options.py
@@ -83,10 +83,6 @@ class Options(optmanager.OptManager):
             "listen_port", int, LISTEN_PORT,
             "Proxy service port."
         )
-        self.add_option(
-            "upstream_bind_address", str, "",
-            "Address to bind upstream requests to."
-        )
         self.add_option(
             "mode", str, "regular",
             """
@@ -105,13 +101,6 @@ class Options(optmanager.OptManager):
             "Enable/disable HTTP/2 support. "
             "HTTP/2 support is enabled by default.",
         )
-        self.add_option(
-            "http2_priority", bool, False,
-            """
-            PRIORITY forwarding for HTTP/2 connections. Disabled by default to ensure compatibility
-            with misbehaving servers.
-            """
-        )
         self.add_option(
             "websocket", bool, True,
             "Enable/disable WebSocket support. "
@@ -122,14 +111,6 @@ class Options(optmanager.OptManager):
             "Enable/disable raw TCP connections. "
             "TCP connections are enabled by default. "
         )
-
-        self.add_option(
-            "spoof_source_address", bool, False,
-            """
-            Use the client's IP for server-side connections. Combine with
-            --upstream-bind-address to spoof a fixed source address.
-            """
-        )
         self.add_option(
             "ssl_insecure", bool, False,
             "Do not verify upstream server SSL/TLS certificates."
@@ -166,11 +147,5 @@ class Options(optmanager.OptManager):
             TLS key size for certificates and CA.
             """
         )
-        self.add_option(
-            "relax_http_form_validation", bool, False,
-            """
-            Disable HTTP form validation.
-            """
-        )
 
         self.update(**kwargs)
diff --git a/mitmproxy/utils/arg_check.py b/mitmproxy/utils/arg_check.py
index a0089ee63..44ef971ac 100644
--- a/mitmproxy/utils/arg_check.py
+++ b/mitmproxy/utils/arg_check.py
@@ -71,7 +71,6 @@ REPLACEMENTS = {
     "--order": "view_order",
     "--no-mouse": "console_mouse",
     "--reverse": "view_order_reversed",
-    "--no-http2-priority": "http2_priority",
     "--no-websocket": "websocket",
     "--no-upstream-cert": "upstream_cert",
     "--upstream-trusted-confdir": "ssl_verify_upstream_trusted_confdir",
diff --git a/test/mitmproxy/addons/test_streambodies.py b/test/mitmproxy/addons/test_streambodies.py
index b980ea0b7..d62f869f1 100644
--- a/test/mitmproxy/addons/test_streambodies.py
+++ b/test/mitmproxy/addons/test_streambodies.py
@@ -29,9 +29,3 @@ def test_simple():
         f = tflow.tflow(resp=True)
         f.response.headers["content-length"] = "invalid"
         tctx.cycle(sa, f)
-
-        tctx.configure(sa, stream_websockets = True)
-        f = tflow.twebsocketflow()
-        assert not f.stream
-        sa.websocket_start(f)
-        assert f.stream