diff --git a/src/wormhole/_dilation/connection.py b/src/wormhole/_dilation/connection.py
index b8f3ec6..c53f036 100644
--- a/src/wormhole/_dilation/connection.py
+++ b/src/wormhole/_dilation/connection.py
@@ -393,7 +393,7 @@ class _Record(object):
         self._framer.send_frame(frame)
 
 
-@attrs
+@attrs(hash=True)
 class DilatedConnectionProtocol(Protocol, object):
     """I manage an L2 connection.
 
diff --git a/src/wormhole/_dilation/connector.py b/src/wormhole/_dilation/connector.py
index aa5f8e0..c9c6ee5 100644
--- a/src/wormhole/_dilation/connector.py
+++ b/src/wormhole/_dilation/connector.py
@@ -39,7 +39,7 @@ NOISEPROTO = b"Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s"
 def build_noise():
     return NoiseConnection.from_name(NOISEPROTO)
 
-@attrs
+@attrs(hash=True)
 @implementer(IDilationConnector)
 class Connector(object):
     _dilation_key = attrib(validator=instance_of(type(b"")))
diff --git a/src/wormhole/_dilation/manager.py b/src/wormhole/_dilation/manager.py
index 18d1770..8e2a0e0 100644
--- a/src/wormhole/_dilation/manager.py
+++ b/src/wormhole/_dilation/manager.py
@@ -87,7 +87,7 @@ def make_side():
 # * if follower calls w.dilate() but not leader, follower waits forever
 #   in "want", leader waits forever in "wanted"
 
-@attrs
+@attrs(hash=True)
 @implementer(IDilationManager)
 class Manager(object):
     _S = attrib(validator=provides(ISend))