diff --git a/capnp/Cargo.toml b/capnp/Cargo.toml
index 79435d8f3..f245cb6ec 100644
--- a/capnp/Cargo.toml
+++ b/capnp/Cargo.toml
@@ -17,7 +17,7 @@ keywords = ["encoding", "protocol", "serialization"]
 [dependencies]
 quickcheck = { version = "1", optional = true }
 
-embedded-io = { version = "0.5.0", default-features = false, optional = true }
+embedded-io = { version = "0.6.0", default-features = false, optional = true }
 
 [dev-dependencies]
 quickcheck = "1"