diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
index f1b5097fa..aedf19dfd 100644
--- a/Cargo-minimal.lock
+++ b/Cargo-minimal.lock
@@ -149,7 +149,6 @@ dependencies = [
  "bitcoin-internals",
  "hex-conservative 0.3.0",
  "serde",
- "serde_json",
  "serde_test",
 ]
 
diff --git a/Cargo-recent.lock b/Cargo-recent.lock
index 558ade0a8..4d452dcd2 100644
--- a/Cargo-recent.lock
+++ b/Cargo-recent.lock
@@ -148,7 +148,6 @@ dependencies = [
  "bitcoin-internals",
  "hex-conservative 0.3.0",
  "serde",
- "serde_json",
  "serde_test",
 ]
 
diff --git a/hashes/Cargo.toml b/hashes/Cargo.toml
index 9a0f8d1a7..f1d67003a 100644
--- a/hashes/Cargo.toml
+++ b/hashes/Cargo.toml
@@ -28,7 +28,6 @@ serde = { version = "1.0", default-features = false, optional = true }
 
 [dev-dependencies]
 serde_test = "1.0"
-serde_json = "1.0"
 
 [package.metadata.docs.rs]
 all-features = true