diff --git a/Cargo.toml b/Cargo.toml
index e0a0cfc..5b6ba65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ repository.workspace = true
 
 [features]
 default = ["ledger", "specter", "coldcard", "bitbox", "jade"]
-bitbox = ["tokio", "hidapi", "bitbox-api", "regex"]
+bitbox = ["tokio", "hidapi", "bitbox-api", "regex", "prost"]
 coldcard = ["dep:coldcard", "regex"]
 specter = ["tokio", "tokio-serial", "serialport"]
 jade = ["tokio", "tokio-serial", "serde", "serde_bytes", "serde_cbor", "serialport", "reqwest"]
@@ -44,6 +44,8 @@ reqwest = { version = "0.11", default-features = false, features = ["json", "rus
 
 # bitbox
 bitbox-api = { version = "0.2.3", default-features = false, features = ["usb", "tokio", "multithreaded"], optional = true }
+# pin the dep to satisfy msrv 1.65
+prost = { version = "=0.12.2", optional = true }
 
 # coldcard
 coldcard = { version = "0.12.1", optional = true }