diff --git a/Cargo.toml b/Cargo.toml
index 1865b1e..6d9789b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,6 @@ default = ["std", "legacy", "error-tracing"]
 # Require std environment.
 std = [
     "frame-metadata/std",
-    "hex/std",
     "parity-scale-codec/std",
     "scale-decode/std",
     "scale-info/std",
@@ -38,7 +37,6 @@ legacy = [
 
 [dependencies]
 frame-metadata = { version = "16.0.0", features = ["current"], default-features = false }
-hex = { version = "0.4.3", default-features = false }
 parity-scale-codec = { version = "3.6.12", default-features = false }
 scale-decode = { version = "0.13.1", default-features = false }
 scale-info = { version = "2.11.3", default-features = false }
@@ -48,6 +46,7 @@ scale-value = { version = "0.16.3", default-features = false, optional = true }
 sp-crypto-hashing = { version = "0.1.0", default-features = false }
 
 [dev-dependencies]
+hex = "0.4.3"
 serde_yaml = "0.9"
 serde_json = "1"
 scale-value = "0.16.2"