diff --git a/Cargo.toml b/Cargo.toml
index b92e563..d31db31 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -50,4 +50,4 @@ walkdir = "2.5"
 yansi = "1.0"
 # we need to pin to commit as the crate version doesn't allow us to detect local `z3` binary.
 z3 =  { git = "https://github.com/prove-rs/z3.rs.git", rev = "247d308f27d8b59152ad402e2d8b13d617a1a6a1" }
-derive_more = "0.99"
+derive_more = "1.0"