diff --git a/Cargo.toml b/Cargo.toml
index 06683a7..089929f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ default = ["avr-std-stub"]
 all-mcus = []
 
 [dependencies]
-avr-config = "1.0"
+avr-config = { version = "2.0", features = ["cpu-frequency"] }
 avr_delay = "0.3"
 avr-std-stub = { version = "1.0", optional = true }
 const_env--value = "0.1"