diff --git a/ruby-sdk/Cargo.lock b/ruby-sdk/Cargo.lock
index 24ba73c4..b6092d59 100644
--- a/ruby-sdk/Cargo.lock
+++ b/ruby-sdk/Cargo.lock
@@ -1477,9 +1477,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.133"
+version = "1.0.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c7fceb2473b9166b2294ef05efcb65a3db80803f0b03ef86a5fc88a2b85ee377"
+checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
 dependencies = [
  "itoa",
  "memchr",
diff --git a/ruby-sdk/ext/eppo_client/Cargo.toml b/ruby-sdk/ext/eppo_client/Cargo.toml
index 167b8f64..565a811b 100644
--- a/ruby-sdk/ext/eppo_client/Cargo.toml
+++ b/ruby-sdk/ext/eppo_client/Cargo.toml
@@ -18,5 +18,5 @@ magnus = { version = "0.7.1" }
 serde = { version = "1.0.203", features = ["derive"] }
 serde_magnus = "0.9.0"
 rb-sys = "0.9.105"
-serde_json = "1.0.128"
+serde_json = "1.0.140"
 tokio = { version = "1.44.1", default-features = false, features = ["time"] }