diff --git a/testgres/api.py b/testgres/api.py
index e4b1cdd5..6a96ee84 100644
--- a/testgres/api.py
+++ b/testgres/api.py
@@ -47,8 +47,6 @@ def get_remote_node(name=None, conn_params=None):
     Simply a wrapper around :class:`.PostgresNode` constructor for remote node.
     See :meth:`.PostgresNode.__init__` for details.
     For remote connection you can add the next parameter:
-    conn_params = ConnectionParams(host='127.0.0.1',
-                                   ssh_key=None,
-                                   username=default_username())
+    conn_params = ConnectionParams(host='127.0.0.1', ssh_key=None, username=default_username())
     """
     return get_new_node(name=name, conn_params=conn_params)
diff --git a/testgres/node.py b/testgres/node.py
index b85a62f2..8a712753 100644
--- a/testgres/node.py
+++ b/testgres/node.py
@@ -1939,6 +1939,7 @@ def make_simple(
 
         return node
 
+    @staticmethod
     def _gettempdir_for_socket():
         platform_system_name = platform.system().lower()
 
@@ -1966,6 +1967,7 @@ def _gettempdir_for_socket():
 
         return "/tmp"
 
+    @staticmethod
     def _gettempdir():
         v = tempfile.gettempdir()
 
@@ -1984,6 +1986,7 @@ def _gettempdir():
         # OK
         return v
 
+    @staticmethod
     def _raise_bugcheck(msg):
         assert type(msg) == str  # noqa: E721
         assert msg != ""
diff --git a/testgres/operations/helpers.py b/testgres/operations/helpers.py
index b50f0baa..03e97edc 100644
--- a/testgres/operations/helpers.py
+++ b/testgres/operations/helpers.py
@@ -2,6 +2,7 @@
 
 
 class Helpers:
+    @staticmethod
     def _make_get_default_encoding_func():
         # locale.getencoding is added in Python 3.11
         if hasattr(locale, 'getencoding'):
@@ -13,6 +14,7 @@ def _make_get_default_encoding_func():
     # Prepared pointer on function to get a name of system codepage
     _get_default_encoding_func = _make_get_default_encoding_func()
 
+    @staticmethod
     def GetDefaultEncoding():
         #
         #   Original idea/source was:
@@ -36,6 +38,7 @@ def GetDefaultEncoding():
         # Is it an unexpected situation?
         return 'UTF-8'
 
+    @staticmethod
     def PrepareProcessInput(input, encoding):
         if not input:
             return None
diff --git a/testgres/operations/local_ops.py b/testgres/operations/local_ops.py
index 5c79bb7e..91070fe7 100644
--- a/testgres/operations/local_ops.py
+++ b/testgres/operations/local_ops.py
@@ -265,6 +265,7 @@ def write(self, filename, data, truncate=False, binary=False, read_and_write=Fal
                 data2 = __class__._prepare_data_to_write(data, binary)
                 file.write(data2)
 
+    @staticmethod
     def _prepare_line_to_write(data, binary):
         data = __class__._prepare_data_to_write(data, binary)
 
@@ -275,6 +276,7 @@ def _prepare_line_to_write(data, binary):
         assert type(data) == str  # noqa: E721
         return data.rstrip('\n') + '\n'
 
+    @staticmethod
     def _prepare_data_to_write(data, binary):
         if isinstance(data, bytes):
             return data if binary else data.decode()
diff --git a/testgres/operations/raise_error.py b/testgres/operations/raise_error.py
index 0e760e74..6031b238 100644
--- a/testgres/operations/raise_error.py
+++ b/testgres/operations/raise_error.py
@@ -3,6 +3,7 @@
 
 
 class RaiseError:
+    @staticmethod
     def UtilityExitedWithNonZeroCode(cmd, exit_code, msg_arg, error, out):
         assert type(exit_code) == int  # noqa: E721
 
@@ -20,12 +21,14 @@ def UtilityExitedWithNonZeroCode(cmd, exit_code, msg_arg, error, out):
             out=out,
             error=error)
 
+    @staticmethod
     def _TranslateDataIntoString(data):
         if type(data) == bytes:  # noqa: E721
             return __class__._TranslateDataIntoString__FromBinary(data)
 
         return str(data)
 
+    @staticmethod
     def _TranslateDataIntoString__FromBinary(data):
         assert type(data) == bytes  # noqa: E721
 
@@ -36,6 +39,7 @@ def _TranslateDataIntoString__FromBinary(data):
 
         return "#cannot_decode_text"
 
+    @staticmethod
     def _BinaryIsASCII(data):
         assert type(data) == bytes  # noqa: E721
 
diff --git a/testgres/operations/remote_ops.py b/testgres/operations/remote_ops.py
index af4c59f9..51f5b2e8 100644
--- a/testgres/operations/remote_ops.py
+++ b/testgres/operations/remote_ops.py
@@ -313,6 +313,7 @@ def write(self, filename, data, truncate=False, binary=False, read_and_write=Fal
 
             os.remove(tmp_file.name)
 
+    @staticmethod
     def _prepare_line_to_write(data, binary, encoding):
         data = __class__._prepare_data_to_write(data, binary, encoding)
 
@@ -323,6 +324,7 @@ def _prepare_line_to_write(data, binary, encoding):
         assert type(data) == str  # noqa: E721
         return data.rstrip('\n') + '\n'
 
+    @staticmethod
     def _prepare_data_to_write(data, binary, encoding):
         if isinstance(data, bytes):
             return data if binary else data.decode(encoding)
diff --git a/tests/test_simple.py b/tests/test_simple.py
index 4e6fb573..a751f0a3 100644
--- a/tests/test_simple.py
+++ b/tests/test_simple.py
@@ -1125,6 +1125,7 @@ def __exit__(self, type, value, traceback):
             __class__.sm_prev_testgres_reserve_port = None
             __class__.sm_prev_testgres_release_port = None
 
+        @staticmethod
         def _proxy__reserve_port():
             assert type(__class__.sm_DummyPortMaxUsage) == int  # noqa: E721
             assert type(__class__.sm_DummyPortTotalUsage) == int  # noqa: E721
@@ -1144,6 +1145,7 @@ def _proxy__reserve_port():
             __class__.sm_DummyPortCurrentUsage += 1
             return __class__.sm_DummyPortNumber
 
+        @staticmethod
         def _proxy__release_port(dummyPortNumber):
             assert type(dummyPortNumber) == int  # noqa: E721