diff --git a/go.mod b/go.mod
index 50ec0b56..714b5b97 100644
--- a/go.mod
+++ b/go.mod
@@ -25,6 +25,6 @@ require (
 	golang.org/x/sync v0.6.0 // indirect
 )
 
-replace github.com/notaryproject/notation-core-go => github.com/Two-Hearts/notation-core-go v0.0.0-20240408053347-db08071e1dba
+replace github.com/notaryproject/notation-core-go => github.com/Two-Hearts/notation-core-go v0.0.0-20240408061121-8c59a124c1ff
 
 replace github.com/notaryproject/tspclient-go => github.com/Two-Hearts/tspclient-go v0.0.0-20240327080830-9d2a35b7f3f0
diff --git a/go.sum b/go.sum
index 8f7b780c..4da3fd58 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 h1:mFRzDkZVAjdal+s7s0MwaRv9igoPqLRdzOLzw/8Xvq8=
 github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
-github.com/Two-Hearts/notation-core-go v0.0.0-20240408053347-db08071e1dba h1:NkrPabtr/MVAsD2NZVkJGkbvnOjoG6wCQPvXIPluyqw=
-github.com/Two-Hearts/notation-core-go v0.0.0-20240408053347-db08071e1dba/go.mod h1:GsHR/83xmdubOk+77PlzIilthZNt+qCY4I9BxMKXbxg=
+github.com/Two-Hearts/notation-core-go v0.0.0-20240408061121-8c59a124c1ff h1:FiCD0T10oRjvO3ADmrkpaiYBZA1U91SfYEK8UTDqDbQ=
+github.com/Two-Hearts/notation-core-go v0.0.0-20240408061121-8c59a124c1ff/go.mod h1:GsHR/83xmdubOk+77PlzIilthZNt+qCY4I9BxMKXbxg=
 github.com/Two-Hearts/tspclient-go v0.0.0-20240327080830-9d2a35b7f3f0 h1:EbUo6vzeco2sq3ipHCL7JtsgAwOXNiM7BRRRLVp2o3U=
 github.com/Two-Hearts/tspclient-go v0.0.0-20240327080830-9d2a35b7f3f0/go.mod h1:LGyA/6Kwd2FlM0uk8Vc5il3j0CddbWSHBj/4kxQDbjs=
 github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74 h1:Kk6a4nehpJ3UuJRqlA3JxYxBZEqCeOmATOvrbT4p9RA=
diff --git a/verifier/verifier.go b/verifier/verifier.go
index 5e58994a..ed27cb03 100644
--- a/verifier/verifier.go
+++ b/verifier/verifier.go
@@ -612,15 +612,7 @@ func verifyAuthenticTimestamp(ctx context.Context, trustPolicy *trustpolicy.Trus
 		timeStampUpperLimit := ts.Add(accuracy)
 		fmt.Printf("timestamp token time range: [%v, %v]\n", timeStampLowerLimit, timeStampUpperLimit)
 		// TSA certificate chain revocation check
-		revocationClient, err := revocation.New(&http.Client{Timeout: 2 * time.Second})
-		if err != nil {
-			return &notation.ValidationResult{
-				Error:  err,
-				Type:   trustpolicy.TypeAuthenticTimestamp,
-				Action: outcome.VerificationLevel.Enforcement[trustpolicy.TypeAuthenticTimestamp],
-			}
-		}
-		certResults, err := revocationClient.Validate(tsaCertChain, timeStampUpperLimit)
+		certResults, err := revocation.ValidateTimestampCertChain(tsaCertChain, timeStampUpperLimit)
 		if err != nil {
 			logger.Debug("error while checking revocation status, err: %s", err.Error())
 			return &notation.ValidationResult{