diff --git a/src/frostfs_testlib/utils/string_utils.py b/src/frostfs_testlib/utils/string_utils.py
index 490217d6..a80192cf 100644
--- a/src/frostfs_testlib/utils/string_utils.py
+++ b/src/frostfs_testlib/utils/string_utils.py
@@ -4,6 +4,7 @@ import string
 
 ONLY_ASCII_LETTERS = string.ascii_letters
 DIGITS_AND_ASCII_LETTERS = string.ascii_letters + string.digits
+NON_DIGITS_AND_LETTERS = string.punctuation
 
 
 def random_string(length: int = 5, source: str = ONLY_ASCII_LETTERS):
@@ -17,7 +18,7 @@ def random_string(length: int = 5, source: str = ONLY_ASCII_LETTERS):
         (str): random string with len == length
     """
 
-    return "".join(random.choice(string.ascii_letters) for i in range(length))
+    return "".join(random.choice(source) for i in range(length))
 
 
 def is_str_match_pattern(error: Exception, status_pattern: str) -> bool: