diff --git b/rules.mk a/rules.mk
index ccb9711..8005071 100644
--- b/rules.mk
+++ a/rules.mk
@@ -9,8 +9,6 @@ MODULE_SRCS := \
 
 MODULE_RUST_EDITION := 2021
 MODULE_LIBRARY_DEPS := \
-	external/rust/crates/arbitrary \
-	external/rust/crates/bytemuck \
 	trusty/user/base/lib/libcompiler_builtins-rust \
 	trusty/user/base/lib/libcore-rust \
 	external/rust/crates/serde \