diff --git a/doc/2.Capabilities.md b/doc/2.Capabilities.md
index 3be2d70..2cbb770 100644
--- a/doc/2.Capabilities.md
+++ b/doc/2.Capabilities.md
@@ -136,7 +136,7 @@ TestSetup:
 TestTeardown: None
 
 Steps:
-1. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|MUT_AUTH_CAP|KEY_EX_CAP|PSK_CAP=1|ENCAP_CAP|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1+
+1. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|MUT_AUTH_CAP|KEY_EX_CAP|PSK_CAP=1|ENCAP_CAP|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1+ (It is invalid because ENCRYPT_CAP and MAC_CAP are clear, when KEY_EX_CAP or PSK_CAP is set.)
 2. SpdmMessage <- Responder
 
 Assertion 2.4.1:
@@ -154,12 +154,12 @@ Assertion 2.4.4:
 Assertion 2.4.5:
     SpdmMessage.Param2 == 0.
 
-3. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|ENCRYPT_CAP|MAC_CAP|MUT_AUTH_CAP|ENCAP_CAP|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1+
+3. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|ENCRYPT_CAP|MAC_CAP|MUT_AUTH_CAP|ENCAP_CAP|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1+ (It is invalid because KEY_EX_CAP and PSK_CAP are clear, when ENCRYPT_CAP or MAC_CAP is set.)
 4. SpdmMessage <- Responder
 
 Assertion 2.4.*.
 
-5. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|ENCRYPT_CAP|MAC_CAP|MUT_AUTH_CAP|KEY_EX_CAP|PSK_CAP=1|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1 only
+5. Requester -> GET_CAPABILITIES {SPDMVersion=NegotiatedVersion, Flags=CERT_CAP|CHAL_CAP|ENCRYPT_CAP|MAC_CAP|MUT_AUTH_CAP|KEY_EX_CAP|PSK_CAP=1|HBEAT_CAP|KEY_UPD_CAP} -- if NegotiatedVersion=1.1 only (It is invalid because ENCAP_CAP is clear, when MUT_AUTH_CAP is set.)
 6. SpdmMessage <- Responder
 
 Assertion 2.4.*.
diff --git a/library/spdm_responder_conformance_test_lib/spdm_responder_test_2_capabilities.c b/library/spdm_responder_conformance_test_lib/spdm_responder_test_2_capabilities.c
index 86d991b..9d88bbc 100644
--- a/library/spdm_responder_conformance_test_lib/spdm_responder_test_2_capabilities.c
+++ b/library/spdm_responder_conformance_test_lib/spdm_responder_test_2_capabilities.c
@@ -1,6 +1,6 @@
 /**
  *  Copyright Notice:
- *  Copyright 2021 DMTF. All rights reserved.
+ *  Copyright 2021-2025 DMTF. All rights reserved.
  *  License: BSD 3-Clause License. For full text see link: https://github.com/DMTF/spdm-emu/blob/main/LICENSE.md
  **/
 
@@ -576,6 +576,7 @@ void spdm_test_case_capabilities_invalid_request (void *test_context)
          * SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MAC_CAP |*/
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MUT_AUTH_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_EX_CAP |
+        SPDM_GET_CAPABILITIES_REQUEST_FLAGS_PSK_CAP_REQUESTER |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_ENCAP_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_HBEAT_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_UPD_CAP,
@@ -584,7 +585,8 @@ void spdm_test_case_capabilities_invalid_request (void *test_context)
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_ENCRYPT_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MAC_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MUT_AUTH_CAP |
-        /* SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_EX_CAP | */
+        /* SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_EX_CAP |
+         * SPDM_GET_CAPABILITIES_REQUEST_FLAGS_PSK_CAP_REQUESTER | */
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_ENCAP_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_HBEAT_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_UPD_CAP,
@@ -594,6 +596,7 @@ void spdm_test_case_capabilities_invalid_request (void *test_context)
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MAC_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_MUT_AUTH_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_EX_CAP |
+        SPDM_GET_CAPABILITIES_REQUEST_FLAGS_PSK_CAP_REQUESTER |
         /* SPDM_GET_CAPABILITIES_REQUEST_FLAGS_ENCAP_CAP | */
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_HBEAT_CAP |
         SPDM_GET_CAPABILITIES_REQUEST_FLAGS_KEY_UPD_CAP,