diff --git a/examples/rust/Cargo.lock b/examples/rust/Cargo.lock
index cd9b02c171..7a505c392e 100644
--- a/examples/rust/Cargo.lock
+++ b/examples/rust/Cargo.lock
@@ -576,7 +576,7 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.4.2"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
 dependencies = [