diff --git a/libafl/Cargo.toml b/libafl/Cargo.toml
index a091524598..12c79f9405 100644
--- a/libafl/Cargo.toml
+++ b/libafl/Cargo.toml
@@ -56,7 +56,7 @@ serde = { version = "1.0", default-features = false, features = ["alloc"] } # se
 erased-serde = "0.3.12"
 postcard = { version = "0.5.1", features = ["alloc"] } # no_std compatible serde serialization fromat
 static_assertions = "1.1.0"
-ctor = "*"
+ctor = "0.1.20"
 libafl_derive = { version = "0.1.0", optional = true, path = "../libafl_derive" }
 serde_json = { version = "1.0", optional = true, default-features = false, features = ["alloc"] } # an easy way to debug print SerdeAnyMap
 compression = { version = "0.1.5" }