diff --git a/tools/ci/check_artifacts_expire_time.py b/tools/ci/check_artifacts_expire_time.py
index 3eb06c177c..33ab6ce725 100644
--- a/tools/ci/check_artifacts_expire_time.py
+++ b/tools/ci/check_artifacts_expire_time.py
@@ -17,7 +17,7 @@ GITLAB_CONFIG_FILE = os.path.join(os.getenv("IDF_PATH"), ".gitlab-ci.yml")
 
 def check_artifacts_expire_time():
     with open(GITLAB_CONFIG_FILE, "r") as f:
-        config = yaml.load(f)
+        config = yaml.load(f, Loader=yaml.Loader)
 
     errors = []
 
diff --git a/tools/tiny-test-fw/CIAssignUnitTest.py b/tools/tiny-test-fw/CIAssignUnitTest.py
index 2ea32e53d8..95ef594512 100644
--- a/tools/tiny-test-fw/CIAssignUnitTest.py
+++ b/tools/tiny-test-fw/CIAssignUnitTest.py
@@ -110,7 +110,7 @@ class UnitTestAssignTest(CIAssignTest.AssignTest):
 
         try:
             with open(test_case_path, "r") as f:
-                raw_data = yaml.load(f)
+                raw_data = yaml.load(f, Loader=yaml.Loader)
             test_cases = raw_data["test cases"]
         except IOError:
             print("Test case path is invalid. Should only happen when use @bot to skip unit test.")
diff --git a/tools/tiny-test-fw/EnvConfig.py b/tools/tiny-test-fw/EnvConfig.py
index 9e6c355517..32bd54c5c5 100644
--- a/tools/tiny-test-fw/EnvConfig.py
+++ b/tools/tiny-test-fw/EnvConfig.py
@@ -52,7 +52,7 @@ class Config(object):
         """
         try:
             with open(config_file) as f:
-                configs = yaml.load(f)[env_name]
+                configs = yaml.load(f, Loader=yaml.Loader)[env_name]
         except (OSError, TypeError, IOError):
             configs = dict()
         return configs
diff --git a/tools/tiny-test-fw/TestCase.py b/tools/tiny-test-fw/TestCase.py
index 80b5485309..ab0798e443 100644
--- a/tools/tiny-test-fw/TestCase.py
+++ b/tools/tiny-test-fw/TestCase.py
@@ -45,7 +45,7 @@ class TestCase(object):
         """
         doc_string = self.test_method.__doc__
         try:
-            doc = yaml.load(doc_string)
+            doc = yaml.load(doc_string, Loader=yaml.Loader)
         except (AttributeError, OSError, UnicodeDecodeError):
             doc = self.DEFAULT_CASE_DOC
         doc.update(self.test_method.env_args)
diff --git a/tools/tiny-test-fw/Utility/CIAssignTest.py b/tools/tiny-test-fw/Utility/CIAssignTest.py
index 6a93f9a885..d47913a9ee 100644
--- a/tools/tiny-test-fw/Utility/CIAssignTest.py
+++ b/tools/tiny-test-fw/Utility/CIAssignTest.py
@@ -150,7 +150,7 @@ class AssignTest(object):
     def _parse_gitlab_ci_config(self, ci_config_file):
 
         with open(ci_config_file, "r") as f:
-            ci_config = yaml.load(f)
+            ci_config = yaml.load(f, Loader=yaml.Loader)
 
         job_list = list()
         for job_name in ci_config:
diff --git a/tools/unit-test-app/tools/UnitTestParser.py b/tools/unit-test-app/tools/UnitTestParser.py
index dbf0613fbf..5cdb50088b 100644
--- a/tools/unit-test-app/tools/UnitTestParser.py
+++ b/tools/unit-test-app/tools/UnitTestParser.py
@@ -49,9 +49,9 @@ class Parser(object):
         self.unit_jobs = {}
         self.file_name_cache = {}
         self.idf_path = idf_path
-        self.tag_def = yaml.load(open(os.path.join(idf_path, self.TAG_DEF_FILE), "r"))
-        self.module_map = yaml.load(open(os.path.join(idf_path, self.MODULE_DEF_FILE), "r"))
-        self.config_dependencies = yaml.load(open(os.path.join(idf_path, self.CONFIG_DEPENDENCY_FILE), "r"))
+        self.tag_def = yaml.load(open(os.path.join(idf_path, self.TAG_DEF_FILE), "r"), Loader=yaml.Loader)
+        self.module_map = yaml.load(open(os.path.join(idf_path, self.MODULE_DEF_FILE), "r"), Loader=yaml.Loader)
+        self.config_dependencies = yaml.load(open(os.path.join(idf_path, self.CONFIG_DEPENDENCY_FILE), "r"), Loader=yaml.Loader)
         # used to check if duplicated test case names
         self.test_case_names = set()
         self.parsing_errors = []