diff --git a/crates/plotnik-lib/Cargo.toml b/crates/plotnik-lib/Cargo.toml
index 4a9b9722..a3ad8465 100644
--- a/crates/plotnik-lib/Cargo.toml
+++ b/crates/plotnik-lib/Cargo.toml
@@ -13,4 +13,4 @@ serde = { version = "1.0.228", features = ["derive"] }
 [dev-dependencies]
 insta = { version = "=1.44.3", features = ["yaml"] }
 indoc = "=2.0.7"
-serde_json = "1.0"
+serde_json = "=1.0.145"