diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index c781f85e..588c1d5d 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 9.0.0
+current_version = 9.1.0
 commit = False
 tag = False
 tag_name = {new_version}
diff --git a/CITATION.cff b/CITATION.cff
index 06dbb01e..1335dd9e 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -5,6 +5,6 @@ authors:
   given-names: "Sep"
   orcid: "https://orcid.org/0009-0009-5828-4345"
 title: "DeepDiff"
-version: 9.0.0
+version: 9.1.0
 date-released: 2026
 url: "https://github.com/seperman/deepdiff"
diff --git a/deepdiff/__init__.py b/deepdiff/__init__.py
index 312b0e35..80349365 100644
--- a/deepdiff/__init__.py
+++ b/deepdiff/__init__.py
@@ -1,6 +1,6 @@
 """This module offers the DeepDiff, DeepSearch, grep, Delta and DeepHash classes."""
 # flake8: noqa
-__version__ = '9.0.0'
+__version__ = '9.1.0'
 import logging
 
 if __name__ == '__main__':
diff --git a/deepdiff/docstrings/index.rst b/deepdiff/docstrings/index.rst
index a374150f..b295e97e 100644
--- a/deepdiff/docstrings/index.rst
+++ b/deepdiff/docstrings/index.rst
@@ -4,7 +4,7 @@
    contain the root `toctree` directive.
 
 
-DeepDiff 9.0.0 documentation!
+DeepDiff 9.1.0 documentation!
 =============================
 
 .. |qluster_link| raw:: html
diff --git a/deepdiff/helper.py b/deepdiff/helper.py
index 3fc61183..18d7e55a 100644
--- a/deepdiff/helper.py
+++ b/deepdiff/helper.py
@@ -1,6 +1,7 @@
 import sys
 import re
 import os
+import math
 import datetime
 import uuid
 import logging
@@ -513,7 +514,7 @@ def number_to_string(number: Any, significant_digits: int, number_format_notatio
     else:
         number = round(number=number, ndigits=significant_digits)  # type: ignore
 
-        if significant_digits == 0:
+        if significant_digits == 0 and math.isfinite(number):  # type: ignore
             number = int(number)  # type: ignore
 
     if number == 0.0:
diff --git a/docs/conf.py b/docs/conf.py
index deb7dd41..83eb1ac0 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -64,9 +64,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '9.0.0'
+version = '9.1.0'
 # The full version, including alpha/beta/rc tags.
-release = '9.0.0'
+release = '9.1.0'
 
 load_dotenv(override=True)
 DOC_VERSION = os.environ.get('DOC_VERSION', version)
diff --git a/pyproject.toml b/pyproject.toml
index 8d9cb691..980cb6f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "flit_core.buildapi"
 
 [project]
 name = "deepdiff"
-version = "9.0.0"
+version = "9.1.0"
 dependencies = [
   "cachebox>=5.2,<6",
   "orderly-set>=5.5.0,<6",
diff --git a/tests/test_diff_text.py b/tests/test_diff_text.py
index fb0087be..c93d185b 100755
--- a/tests/test_diff_text.py
+++ b/tests/test_diff_text.py
@@ -1877,6 +1877,29 @@ def gen2():
     def test_ignore_nan_inequality(self, t1, t2, params, expected_result):
         assert expected_result == list(DeepDiff(t1, t2, **params).keys())
 
+    @pytest.mark.parametrize('t1, t2, params', [
+        (float('nan'), float('nan'), {'significant_digits': 0}),
+        (float('nan'), float('nan'), {'significant_digits': 2}),
+        (float('inf'), float('inf'), {'significant_digits': 0}),
+        (float('inf'), float('inf'), {'significant_digits': 2}),
+        (float('-inf'), float('-inf'), {'significant_digits': 0}),
+        (float('-inf'), float('-inf'), {'significant_digits': 2}),
+        ({'a': float('nan'), 'b': 1.5}, {'a': float('nan'), 'b': 2.7},
+         {'significant_digits': 0}),
+        ({'a': float('inf')}, {'a': float('inf')},
+         {'significant_digits': 0}),
+    ])
+    def test_significant_digits_with_nan_inf(self, t1, t2, params):
+        """
+        Test that significant_digits does not crash with NaN or Inf values.
+        Regression test for ValueError/OverflowError when converting NaN/Inf
+        to int in number_to_string with significant_digits=0.
+        """
+        try:
+            DeepDiff(t1, t2, **params)
+        except (ValueError, OverflowError) as e:
+            pytest.fail(f"DeepDiff with {params} on {t1!r} raised {type(e).__name__}: {e}")
+
     @pytest.mark.parametrize('ignore_order, ignore_private_variables, expected', [
         (True, True, {}),
         (False, True, {}),