diff --git a/bench-cargo-miri/serde1/Cargo.toml b/bench-cargo-miri/serde1/Cargo.toml
index 29f0abff5d73..7cb863a7abf3 100644
--- a/bench-cargo-miri/serde1/Cargo.toml
+++ b/bench-cargo-miri/serde1/Cargo.toml
@@ -5,5 +5,5 @@ authors = ["Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de>"]
 edition = "2018"
 
 [dependencies]
-serde = { version = "*", features = ["derive"] }
-serde_json = "*"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
diff --git a/bench-cargo-miri/serde2/Cargo.toml b/bench-cargo-miri/serde2/Cargo.toml
index 29f0abff5d73..7cb863a7abf3 100644
--- a/bench-cargo-miri/serde2/Cargo.toml
+++ b/bench-cargo-miri/serde2/Cargo.toml
@@ -5,5 +5,5 @@ authors = ["Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de>"]
 edition = "2018"
 
 [dependencies]
-serde = { version = "*", features = ["derive"] }
-serde_json = "*"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"