diff --git a/opensmtpd-derive/Cargo.toml b/opensmtpd-derive/Cargo.toml
index 641ccbf..b212300 100644
--- a/opensmtpd-derive/Cargo.toml
+++ b/opensmtpd-derive/Cargo.toml
@@ -17,4 +17,4 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = { version = "1.0", features = ["full", "extra-traits"] }
+syn = { version = "1.0", default-features = false, features = ["full", "parsing", "printing", "proc-macro"] }
diff --git a/opensmtpd/Cargo.toml b/opensmtpd/Cargo.toml
index e32dd37..ffb49c2 100644
--- a/opensmtpd/Cargo.toml
+++ b/opensmtpd/Cargo.toml
@@ -14,7 +14,7 @@ include = ["src/**/*", "Cargo.toml", "../LICENSE-*.txt"]
 [dependencies]
 log = "0.4"
 nom = "6.0"
-opensmtpd_derive = { path = "../opensmtpd-derive" }
+opensmtpd_derive = { version = "0.3", path = "../opensmtpd-derive" }
 pretty-hex = "0.2"
 
 [dev-dependencies]