diff --git a/Lib/test/test_robotparser.py b/Lib/test/test_robotparser.py
index 725c6e3b09e1d0..44cd67f268c688 100644
--- a/Lib/test/test_robotparser.py
+++ b/Lib/test/test_robotparser.py
@@ -246,6 +246,28 @@ class InvalidCrawlDelayTest(BaseRobotTest, unittest.TestCase):
     bad = []
 
 
+class NonDecimalCrawlDelayTest(BaseRequestRateTest, unittest.TestCase):
+    # Non-decimal Unicode digits pass str.isdigit() but int() rejects
+    # them, so the directive must be silently ignored, not raise.
+    robots_txt = """\
+User-Agent: *
+Disallow: /.
+Crawl-delay: ²
+    """
+    good = ['/foo.html']
+    bad = []
+
+
+class NonDecimalRequestRateTest(BaseRequestRateTest, unittest.TestCase):
+    robots_txt = """\
+User-agent: *
+Disallow: /tmp/
+Request-rate: ²/5
+    """
+    good = ['/foo.html']
+    bad = ['/tmp/']
+
+
 class AnotherInvalidRequestRateTest(BaseRobotTest, unittest.TestCase):
     # also test that Allow and Diasallow works well with each other
     robots_txt = """\
diff --git a/Lib/urllib/robotparser.py b/Lib/urllib/robotparser.py
index 61772d90e2d53b..8d0311d96f5e0b 100644
--- a/Lib/urllib/robotparser.py
+++ b/Lib/urllib/robotparser.py
@@ -148,15 +148,15 @@ def parse(self, lines):
                         # before trying to convert to int we need to make
                         # sure that robots.txt has valid syntax otherwise
                         # it will crash
-                        if line[1].strip().isdigit():
+                        if line[1].strip().isdecimal():
                             entry.delay = int(line[1])
                         state = 2
                 elif line[0] == "request-rate":
                     if state != 0:
                         numbers = line[1].split('/')
                         # check if all values are sane
-                        if (len(numbers) == 2 and numbers[0].strip().isdigit()
-                            and numbers[1].strip().isdigit()):
+                        if (len(numbers) == 2 and numbers[0].strip().isdecimal()
+                            and numbers[1].strip().isdecimal()):
                             entry.req_rate = RequestRate(int(numbers[0]), int(numbers[1]))
                         state = 2
                 elif line[0] == "sitemap":
diff --git a/Misc/NEWS.d/next/Library/2026-07-09-16-35-47.gh-issue-153404.daRkes.rst b/Misc/NEWS.d/next/Library/2026-07-09-16-35-47.gh-issue-153404.daRkes.rst
new file mode 100644
index 00000000000000..0746d3f12149d5
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-09-16-35-47.gh-issue-153404.daRkes.rst
@@ -0,0 +1,4 @@
+:class:`urllib.robotparser.RobotFileParser` now silently ignores a
+``Crawl-delay`` or ``Request-rate`` value written with non-decimal digits
+(such as ``U+00B2 SUPERSCRIPT TWO``) instead of raising :exc:`ValueError`
+and aborting the parse of the whole ``robots.txt`` file.