diff --git a/Cargo.toml b/Cargo.toml
index ad1ee19..0fcde5b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,8 @@ panic-halt = "0.2.0"
 ufmt = "0.2.0"
 nb = "1"
 embedded-hal = "1"
+avr-device-macros = "0"
+avr-device = "0"
 
 [dependencies.avr-hal-generic]
 git = "https://github.com/rahix/avr-hal"
@@ -39,4 +41,4 @@ panic = "abort"
 codegen-units = 1
 debug = true
 lto = true
-opt-level = "s"
+opt-level = "z"