diff --git a/spdmlib/src/protocol/version.rs b/spdmlib/src/protocol/version.rs
index e42d487..b49e17e 100644
--- a/spdmlib/src/protocol/version.rs
+++ b/spdmlib/src/protocol/version.rs
@@ -10,6 +10,7 @@ pub enum SpdmVersion {
     SpdmVersion10,
     SpdmVersion11,
     SpdmVersion12,
+    SpdmVersion13,
 }
 
 impl Default for SpdmVersion {
@@ -27,6 +28,8 @@ impl TryFrom<u8> for SpdmVersion {
             Ok(SpdmVersion::SpdmVersion11)
         } else if untrusted_spdm_version == 0x12 {
             Ok(SpdmVersion::SpdmVersion12)
+        } else if untrusted_spdm_version == 0x13 {
+            Ok(SpdmVersion::SpdmVersion13)
         } else {
             Err(())
         }
@@ -39,6 +42,7 @@ impl From<SpdmVersion> for u8 {
             SpdmVersion::SpdmVersion10 => 0x10,
             SpdmVersion::SpdmVersion11 => 0x11,
             SpdmVersion::SpdmVersion12 => 0x12,
+            SpdmVersion::SpdmVersion13 => 0x13,
         }
     }
 }
@@ -60,7 +64,7 @@ impl Codec for SpdmVersion {
     }
 }
 
-pub const MAX_SPDM_VERSION_COUNT: usize = 3;
+pub const MAX_SPDM_VERSION_COUNT: usize = 4;
 
 //SPDM V1.2 signing prefix context
 pub const SPDM_VERSION_1_2_SIGNING_PREFIX_CONTEXT: [u8; 64] = [
diff --git a/test/spdm-requester-emu/src/main.rs b/test/spdm-requester-emu/src/main.rs
index 853406f..fd2a934 100644
--- a/test/spdm-requester-emu/src/main.rs
+++ b/test/spdm-requester-emu/src/main.rs
@@ -121,6 +121,7 @@ async fn test_spdm(
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            None,
         ],
         req_capabilities,
         req_ct_exponent: 0,
@@ -609,6 +610,7 @@ async fn test_idekm_tdisp(
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            None,
         ],
         req_capabilities,
         req_ct_exponent: 0,
diff --git a/test/spdm-responder-emu/src/main.rs b/test/spdm-responder-emu/src/main.rs
index d41289f..481a865 100644
--- a/test/spdm-responder-emu/src/main.rs
+++ b/test/spdm-responder-emu/src/main.rs
@@ -285,6 +285,7 @@ async fn handle_message(
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            None,
         ],
         rsp_capabilities,
         rsp_ct_exponent: 0,
diff --git a/test/spdmlib-test/src/common/util.rs b/test/spdmlib-test/src/common/util.rs
index d846db1..02148b3 100644
--- a/test/spdmlib-test/src/common/util.rs
+++ b/test/spdmlib-test/src/common/util.rs
@@ -37,6 +37,7 @@ pub fn create_info() -> (SpdmConfigInfo, SpdmProvisionInfo) {
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            Some(SpdmVersion::SpdmVersion13),
         ],
         rsp_capabilities: SpdmResponseCapabilityFlags::CERT_CAP
             | SpdmResponseCapabilityFlags::CHAL_CAP
@@ -176,6 +177,7 @@ pub fn req_create_info() -> (SpdmConfigInfo, SpdmProvisionInfo) {
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            None,
         ],
         req_capabilities: req_capabilities,
         req_ct_exponent: 0,
@@ -305,6 +307,7 @@ pub fn rsp_create_info() -> (SpdmConfigInfo, SpdmProvisionInfo) {
             Some(SpdmVersion::SpdmVersion10),
             Some(SpdmVersion::SpdmVersion11),
             Some(SpdmVersion::SpdmVersion12),
+            Some(SpdmVersion::SpdmVersion13),
         ],
         rsp_capabilities: rsp_capabilities,
         rsp_ct_exponent: 0,
diff --git a/test/spdmlib-test/src/responder_tests/version_rsp.rs b/test/spdmlib-test/src/responder_tests/version_rsp.rs
index 0000a1f..d6fb6fa 100644
--- a/test/spdmlib-test/src/responder_tests/version_rsp.rs
+++ b/test/spdmlib-test/src/responder_tests/version_rsp.rs
@@ -73,7 +73,7 @@ fn test_case0_handle_spdm_version() {
             SpdmRequestResponseCode::SpdmResponseVersion
         );
         if let SpdmMessagePayload::SpdmVersionResponse(payload) = &spdm_message.payload {
-            assert_eq!(payload.version_number_entry_count, 0x03);
+            assert_eq!(payload.version_number_entry_count, 0x04);
             assert_eq!(payload.versions[0].update, 0);
             assert_eq!(payload.versions[0].version, SpdmVersion::SpdmVersion10);
             assert_eq!(payload.versions[1].update, 0);