diff --git a/kalk_cli/Cargo.lock b/kalk_cli/Cargo.lock
index c59223c..225806a 100644
--- a/kalk_cli/Cargo.lock
+++ b/kalk_cli/Cargo.lock
@@ -141,6 +141,7 @@ name = "kalk"
 version = "0.1.0"
 dependencies = [
  "phf",
+ "regex",
  "rug",
  "test-case",
 ]