diff --git a/chain-impl-mockchain/Cargo.toml b/chain-impl-mockchain/Cargo.toml
index 36ba487fd..2b966d841 100644
--- a/chain-impl-mockchain/Cargo.toml
+++ b/chain-impl-mockchain/Cargo.toml
@@ -17,7 +17,7 @@ typed-bytes = { path = "../typed-bytes" }
 rand_core = "0.6"
 imhamt = { path = "../imhamt" }
 sparse-array = { path = "../sparse-array" }
-strum = "0.21.0"
+strum = "0.22.0"
 strum_macros = "0.21.0"
 hex = { version = "0.4.2", default-features = false, features = [ "std" ] }
 quickcheck = { version = "0.9", optional = true }