diff --git a/crates/rpc-types-engine/src/cancun.rs b/crates/rpc-types-engine/src/cancun.rs
index 28fc6ad0aa0..eddef715d67 100644
--- a/crates/rpc-types-engine/src/cancun.rs
+++ b/crates/rpc-types-engine/src/cancun.rs
@@ -22,6 +22,7 @@ pub struct CancunPayloadFields {
 
 /// A container type for [CancunPayloadFields] that may or may not be present.
 #[derive(Clone, Debug, Default, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct MaybeCancunPayloadFields {
     fields: Option<CancunPayloadFields>,
 }
diff --git a/crates/rpc-types-engine/src/sidecar.rs b/crates/rpc-types-engine/src/sidecar.rs
index a911c62f421..a640508bcd8 100644
--- a/crates/rpc-types-engine/src/sidecar.rs
+++ b/crates/rpc-types-engine/src/sidecar.rs
@@ -8,6 +8,7 @@ use alloy_primitives::B256;
 /// Container type for all available additional `newPayload` request parameters that are not present
 /// in the `ExecutionPayload` object itself.
 #[derive(Debug, Clone, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ExecutionPayloadSidecar {
     /// Cancun request params introduced in `engine_newPayloadV3` that are not present in the
     /// `ExecutionPayload`.