diff --git b/rules.mk a/rules.mk
index 4e31c7c..17355aa 100644
--- b/rules.mk
+++ a/rules.mk
@@ -15,9 +15,8 @@ MODULE_RUSTFLAGS += \
 	--cfg 'feature="zeroize"' \
 
 MODULE_LIBRARY_DEPS := \
-	external/rust/crates/base16ct \
-	external/rust/crates/generic-array \
-	external/rust/crates/serdect \
-	external/rust/crates/subtle \
+	external/rust/crates/der \
+	external/rust/crates/pkcs8 \
+	external/rust/crates/zeroize \
 
 include make/library.mk