diff --git a/Cargo.toml b/Cargo.toml
index 0ab4221..d1a2cbc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ num-bigint = "0.2.6"
 num-traits = "0.2.11"
 once_cell = "1.3.1"
 rand = { version = "0.7.3", optional = true }
+codemap = "0.1.2"
 
 [features]
 default = ["commandline", "random"]