diff --git a/Cargo.toml b/Cargo.toml
index fd4766c..d53328a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ all-mcus = []
 
 [dependencies]
 avr-config = { version = "2.0", features = ["cpu-frequency"] }
-avr_delay = { git = "https://github.com/avr-rust/delay", version = "0.4" }
+avr_delay = { git = "https://github.com/avr-rust/delay", version = "0.4.0" }
 avr-std-stub = { version = "1.0", optional = true }
 const_env--value = "0.1"
 target-cpu-macro = "0.1"