1diff --git b/rules.mk a/rules.mk
2index 25bd083..bd3edb9 100644
3--- b/rules.mk
4+++ a/rules.mk
5@@ -12,8 +12,6 @@ MODULE_RUSTFLAGS += \
6 	--cfg 'feature="alloc"' \
7
8 MODULE_LIBRARY_DEPS := \
9-	external/rust/crates/base64ct \
10 	external/rust/crates/der \
11-	external/rust/crates/sha2 \
12
13 include make/library.mk
14