diff --git a/ruby-sdk/Cargo.lock b/ruby-sdk/Cargo.lock
index 36956aef..66cdb73a 100644
--- a/ruby-sdk/Cargo.lock
+++ b/ruby-sdk/Cargo.lock
@@ -1439,10 +1439,11 @@ checksum = "a3f0bf26fd526d2a95683cd0f87bf103b8539e2ca1ef48ce002d67aad59aa0b4"
 
 [[package]]
 name = "serde"
-version = "1.0.215"
+version = "1.0.224"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6513c1ad0b11a9376da888e3e0baa0077f1aed55c17f50e7b2397136129fb88f"
+checksum = "6aaeb1e94f53b16384af593c71e20b095e958dab1d26939c1b70645c5cfbcc0b"
 dependencies = [
+ "serde_core",
  "serde_derive",
 ]
 
@@ -1455,11 +1456,20 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_core"
+version = "1.0.224"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32f39390fa6346e24defbcdd3d9544ba8a19985d0af74df8501fbfe9a64341ab"
+dependencies = [
+ "serde_derive",
+]
+
 [[package]]
 name = "serde_derive"
-version = "1.0.215"
+version = "1.0.224"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad1e866f866923f252f05c889987993144fb74e722403468a4ebd70c3cd756c0"
+checksum = "87ff78ab5e8561c9a675bfc1785cb07ae721f0ee53329a595cefd8c04c2ac4e0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1477,14 +1487,15 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.133"
+version = "1.0.145"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c7fceb2473b9166b2294ef05efcb65a3db80803f0b03ef86a5fc88a2b85ee377"
+checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
 dependencies = [
  "itoa",
  "memchr",
  "ryu",
  "serde",
+ "serde_core",
 ]
 
 [[package]]
diff --git a/ruby-sdk/ext/eppo_client/Cargo.toml b/ruby-sdk/ext/eppo_client/Cargo.toml
index 981114b4..85a6c92e 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 = "1.0.145"
 tokio = { version = "1.44.1", default-features = false, features = ["time"] }