diff --git a/Cargo.toml b/Cargo.toml
index df0158c6..949bdadc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ r0 = "0.2.2"
 cortex-m-rt-macros = { path = "macros", version = "0.1.5" }
 
 [dev-dependencies]
-cortex-m = "0.5.7"
+cortex-m = ">= 0.5.7, <0.7"
 panic-halt = "0.2.0"
 cortex-m-semihosting = "0.3.1"
 
@@ -39,4 +39,4 @@ required-features = ["device"]
 device = []
 
 [package.metadata.docs.rs]
-features = ["device"]
\ No newline at end of file
+features = ["device"]