diff --git a/src/uu/stdbuf/src/libstdbuf/Cargo.toml b/src/uu/stdbuf/src/libstdbuf/Cargo.toml
index ee71c07d5..f6fc9964f 100644
--- a/src/uu/stdbuf/src/libstdbuf/Cargo.toml
+++ b/src/uu/stdbuf/src/libstdbuf/Cargo.toml
@@ -20,7 +20,7 @@ crate-type = [
 ] # XXX: note: the rlib is just to prevent Cargo from spitting out a warning
 
 [dependencies]
-cpp = "0.5"
+cpp = "0.5.9"
 libc = { workspace = true }
 
 [build-dependencies]