diff --git a/hashes/Cargo.toml b/hashes/Cargo.toml
index f1d67003a..99caab0b0 100644
--- a/hashes/Cargo.toml
+++ b/hashes/Cargo.toml
@@ -24,7 +24,7 @@ small-hash = []
 [dependencies]
 internals = { package = "bitcoin-internals", path = "../internals" }
 hex = { package = "hex-conservative", version = "0.3.0", default-features = false, optional = true }
-serde = { version = "1.0", default-features = false, optional = true }
+serde = { version = "1.0.103", default-features = false, optional = true }
 
 [dev-dependencies]
 serde_test = "1.0"