diff --git a/chain-impl-mockchain/Cargo.toml b/chain-impl-mockchain/Cargo.toml
index 9f75be8a0..d1dcd52ef 100644
--- a/chain-impl-mockchain/Cargo.toml
+++ b/chain-impl-mockchain/Cargo.toml
@@ -16,7 +16,7 @@ rand_core = "0.5"
 imhamt = { path = "../imhamt" }
 sparse-array = { path = "../sparse-array" }
 strum = "0.18.0"
-strum_macros = "0.18.0"
+strum_macros = "0.19.1"
 cfg-if = "0.1"
 hex = { version = "0.4.2", default-features = false, features = [ "std" ] }
 quickcheck = { version = "0.9", optional = true }