diff --git a/tests/scripts/thread-cert/Cert_5_8_02_KeyIncrement.py b/tests/scripts/thread-cert/Cert_5_8_02_KeyIncrement.py
index af305c613..230b3163d 100755
--- a/tests/scripts/thread-cert/Cert_5_8_02_KeyIncrement.py
+++ b/tests/scripts/thread-cert/Cert_5_8_02_KeyIncrement.py
@@ -42,13 +42,11 @@ class Cert_5_8_2_KeyIncrement(thread_cert.TestCase):
     TOPOLOGY = {
         LEADER: {
             'name': 'LEADER',
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [ROUTER]
         },
         ROUTER: {
             'name': 'ROUTER',
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [LEADER]
         },
diff --git a/tests/scripts/thread-cert/Cert_5_8_03_KeyIncrementRollOver.py b/tests/scripts/thread-cert/Cert_5_8_03_KeyIncrementRollOver.py
index 382c247aa..68a2bd7a4 100755
--- a/tests/scripts/thread-cert/Cert_5_8_03_KeyIncrementRollOver.py
+++ b/tests/scripts/thread-cert/Cert_5_8_03_KeyIncrementRollOver.py
@@ -43,13 +43,11 @@ class Cert_5_8_3_KeyIncrementRollOver(thread_cert.TestCase):
         LEADER: {
             'name': 'LEADER',
             'key_sequence_counter': 127,
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [ROUTER]
         },
         ROUTER: {
             'name': 'ROUTER',
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [LEADER]
         },
diff --git a/tests/scripts/thread-cert/Cert_6_6_01_KeyIncrement.py b/tests/scripts/thread-cert/Cert_6_6_01_KeyIncrement.py
index 6ad6e6ecc..b1a907188 100755
--- a/tests/scripts/thread-cert/Cert_6_6_01_KeyIncrement.py
+++ b/tests/scripts/thread-cert/Cert_6_6_01_KeyIncrement.py
@@ -42,14 +42,12 @@ class Cert_6_6_1_KeyIncrement(thread_cert.TestCase):
     TOPOLOGY = {
         LEADER: {
             'name': 'LEADER',
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [ED]
         },
         ED: {
             'name': 'ED',
             'is_mtd': True,
-            'key_switch_guardtime': 0,
             'mode': 'rn',
             'allowlist': [LEADER]
         },
diff --git a/tests/scripts/thread-cert/Cert_6_6_02_KeyIncrementRollOver.py b/tests/scripts/thread-cert/Cert_6_6_02_KeyIncrementRollOver.py
index d7e078537..812e7f3d8 100755
--- a/tests/scripts/thread-cert/Cert_6_6_02_KeyIncrementRollOver.py
+++ b/tests/scripts/thread-cert/Cert_6_6_02_KeyIncrementRollOver.py
@@ -43,14 +43,12 @@ class Cert_6_6_2_KeyIncrement1(thread_cert.TestCase):
         LEADER: {
             'name': 'LEADER',
             'key_sequence_counter': 127,
-            'key_switch_guardtime': 0,
             'mode': 'rdn',
             'allowlist': [ED]
         },
         ED: {
             'name': 'ED',
             'is_mtd': True,
-            'key_switch_guardtime': 0,
             'mode': 'rn',
             'allowlist': [LEADER]
         },
diff --git a/tests/scripts/thread-cert/thread_cert.py b/tests/scripts/thread-cert/thread_cert.py
index 9603309ba..6da6dc2cc 100644
--- a/tests/scripts/thread-cert/thread_cert.py
+++ b/tests/scripts/thread-cert/thread_cert.py
@@ -207,8 +207,6 @@ class TestCase(NcpSupportMixin, unittest.TestCase):
                                                   channel=params['pending_dataset'].get('channel'),
                                                   delay=params['pending_dataset'].get('delay'))
 
-            if 'key_switch_guardtime' in params:
-                self.nodes[i].set_key_switch_guardtime(params['key_switch_guardtime'])
             if 'key_sequence_counter' in params:
                 self.nodes[i].set_key_sequence_counter(params['key_sequence_counter'])