diff --git a/Cargo.toml b/Cargo.toml
index c906326..34151da 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,7 +45,10 @@ build = "build.rs"
 [dependencies]
 abomonation = { version = "=0.7.3", optional = true }
 abomonation_derive = { version = "=0.5.0", optional = true }
-alkahest = { version = "=0.3.0", optional = true, features = ["derive"] }
+alkahest = { version = "=0.1.5", optional = true, features = [
+  "derive",
+  "nightly",
+] }
 bebop = { version = "=2.8.7", optional = true }
 bilrost = { version = "=0.1009.0", optional = true }
 bincode1 = { package = "bincode", version = "=1.3.3", optional = true }