diff --git a/Cargo.toml b/Cargo.toml
index f7c74267..436f2b12 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,4 +13,4 @@ repository = "https://github.com/rust-embedded/panic-itm"
 version = "0.4.0"
 
 [dependencies]
-cortex-m = "0.5.6"
+cortex-m = ">=0.5.6,<0.7"