diff --git a/mitmproxy/proxy/mode_servers.py b/mitmproxy/proxy/mode_servers.py
index a8ff78d70..855b21d54 100644
--- a/mitmproxy/proxy/mode_servers.py
+++ b/mitmproxy/proxy/mode_servers.py
@@ -465,10 +465,8 @@ class LocalRedirectorInstance(ServerInstance[mode_specs.LocalMode]):
         if self._instance:
             raise RuntimeError("Cannot spawn more than one local redirector.")
 
-        if self.mode.data.startswith("!"):
-            spec = f"{self.mode.data},{os.getpid()}"
-        elif self.mode.data:
-            spec = self.mode.data
+        if self.mode.data:
+            spec = f"{self.mode.data},!{os.getpid()}"
         else:
             spec = f"!{os.getpid()}"
 
diff --git a/pyproject.toml b/pyproject.toml
index c86752863..e5e59ea17 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
     "hyperframe>=6.0,<=6.0.1",
     "kaitaistruct>=0.10,<=0.10",
     "ldap3>=2.8,<=2.9.1",
-    "mitmproxy_rs>=0.5.1,<0.6",  # relaxed upper bound here: we control this
+    "mitmproxy_rs>=0.6.0,<0.7",  # relaxed upper bound here: we control this
     "msgpack>=1.0.0,<=1.0.8",
     "passlib>=1.6.5,<=1.7.4",
     "protobuf<=5.27.2,>=5.27.2",