diff --git a/Cargo.lock b/Cargo.lock
index 79f96aa4..3578df8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -499,13 +499,22 @@ dependencies = [
  "embedded-io",
 ]
 
+[[package]]
+name = "capnp"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ebfc0da565e747b1640e029bfbda72f61f39fcddfc8b465b4ae3f3e8b649f78"
+dependencies = [
+ "embedded-io",
+]
+
 [[package]]
 name = "capnpc"
-version = "0.26.0"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13aea06b902f885cb0313b11e900e96cd57fef775e9e601a96e14e1d655f3cd3"
+checksum = "82ca16312ddb64529d31c8dc46148671c22e57b80134fa5f17811ad5a6a79492"
 dependencies = [
- "capnp",
+ "capnp 0.27.0",
 ]
 
 [[package]]
@@ -1181,7 +1190,7 @@ dependencies = [
 name = "echidna-wire"
 version = "0.1.0"
 dependencies = [
- "capnp",
+ "capnp 0.26.0",
  "capnpc",
 ]
 
diff --git a/crates/echidna-wire/Cargo.toml b/crates/echidna-wire/Cargo.toml
index 20000256..2196fb74 100644
--- a/crates/echidna-wire/Cargo.toml
+++ b/crates/echidna-wire/Cargo.toml
@@ -14,4 +14,4 @@ build       = "build.rs"
 capnp = "0.26"
 
 [build-dependencies]
-capnpc = "0.26"
+capnpc = "0.27"