diff --git a/packages/core/src/vcdm/abi/ABIContract.ts b/packages/core/src/vcdm/abi/ABIContract.ts
index a00082c2e..9e2b8bb1a 100644
--- a/packages/core/src/vcdm/abi/ABIContract.ts
+++ b/packages/core/src/vcdm/abi/ABIContract.ts
@@ -211,10 +211,10 @@ class ABIContract extends ABI {
      * @returns {DecodeEventLogReturnType} The decoded data of the event log.
      * @throws {InvalidAbiDataToEncodeOrDecode}
      */
-    public decodeEventLog(
+    public decodeEventLog<TAbi extends ViemABI>(
         eventName: string,
         eventToDecode: ABIEventData
-    ): DecodeEventLogReturnType {
+    ): DecodeEventLogReturnType<TAbi, undefined> {
         try {
             const eventAbiItem = getAbiItem({
                 abi: this.abi,
@@ -245,7 +245,10 @@ class ABIContract extends ABI {
      * @returns {DecodeEventLogReturnType} - A log object representing the decoded log or null if decoding fails.
      * @throws {InvalidAbiDataToEncodeOrDecode}
      */
-    public parseLog(data: Hex, topics: Hex[]): DecodeEventLogReturnType {
+    public parseLog<TAbi extends ViemABI>(
+        data: Hex,
+        topics: Hex[]
+    ): DecodeEventLogReturnType<TAbi, undefined> {
         try {
             return ABIEvent.parseLog(this.abi, { data, topics });
         } catch (e) {
diff --git a/packages/core/src/vcdm/abi/ABIEvent.ts b/packages/core/src/vcdm/abi/ABIEvent.ts
index af221f80d..8906f3aa2 100644
--- a/packages/core/src/vcdm/abi/ABIEvent.ts
+++ b/packages/core/src/vcdm/abi/ABIEvent.ts
@@ -55,10 +55,10 @@ class ABIEvent extends ABIItem {
      * @returns Decoding results.
      * @throws {InvalidAbiDataToEncodeOrDecode}
      */
-    public static parseLog(
-        abi: ViemABI,
+    public static parseLog<TAbi extends ViemABI>(
+        abi: TAbi,
         eventData: ABIEventData
-    ): DecodeEventLogReturnType {
+    ): DecodeEventLogReturnType<TAbi, undefined> {
         try {
             return viemDecodeEventLog({
                 abi,
@@ -95,9 +95,11 @@ class ABIEvent extends ABIItem {
      * @returns Decoding results.
      * @throws {InvalidAbiDataToEncodeOrDecode}
      */
-    public decodeEventLog(event: ABIEventData): DecodeEventLogReturnType {
+    public decodeEventLog<TAbi extends ViemABI>(
+        event: ABIEventData
+    ): DecodeEventLogReturnType<TAbi, undefined> {
         try {
-            return ABIEvent.parseLog([this.abiEvent], event);
+            return ABIEvent.parseLog([this.abiEvent] as ViemABI, event);
         } catch (error) {
             throw new InvalidAbiDataToEncodeOrDecode(
                 'ABIEvent.decodeEventLog',