diff --git a/src/wikitextprocessor/core.py b/src/wikitextprocessor/core.py
index 5c3e4cd..741abe5 100644
--- a/src/wikitextprocessor/core.py
+++ b/src/wikitextprocessor/core.py
@@ -1332,7 +1332,7 @@ def expand_args(coded: str, argmap: TemplateArgs) -> str:
                             expand_args(args[0], argmap), parent, True
                         ).strip()
                         self.expand_stack.pop()
-                        if k.isdigit() and int(k) > 0:
+                        if k.isdecimal() and int(k) > 0:
                             k = int(k)
                         else:
                             k = re.sub(r"\s+", " ", k).strip()
@@ -1550,7 +1550,7 @@ def expander(arg: str) -> str:
                             # https://en.wikipedia.org/wiki/Help:Template
                             # (but not around unnamed parameters)
                             k, arg = m2.groups()
-                            if k.isdigit() and int(k) > 0:
+                            if k.isdecimal() and int(k) > 0:
                                 k = int(k)
                             else:
                                 self.expand_stack.append("ARGNAME")
diff --git a/src/wikitextprocessor/luaexec.py b/src/wikitextprocessor/luaexec.py
index 9ab9366..736abe9 100644
--- a/src/wikitextprocessor/luaexec.py
+++ b/src/wikitextprocessor/luaexec.py
@@ -135,7 +135,7 @@ def recurse(x: Union[list, tuple, dict]) -> Any:
         # Convert numeric keys to integers and see if we can make it a
         # table with sequential integer keys.
         for k, v in list(x.items()):
-            if k.isdigit() and int(k) > 0:
+            if k.isdecimal() and int(k) > 0:
                 del x[k]
                 x[int(k)] = recurse(v)
             else:
@@ -440,7 +440,7 @@ def make_frame(
                 if m is not None:
                     # named parameter
                     k, arg = m.groups()
-                    if k.isdigit() and int(k) > 0:
+                    if k.isdecimal() and int(k) > 0:
                         # Greek wiktionary uses '0', '00' and '000' as
                         # parameter names...
                         k = int(k)
diff --git a/src/wikitextprocessor/parser.py b/src/wikitextprocessor/parser.py
index a8fac10..b7a169b 100644
--- a/src/wikitextprocessor/parser.py
+++ b/src/wikitextprocessor/parser.py
@@ -651,7 +651,7 @@ def template_parameters(self) -> TemplateParameters:
                                 equal_sign_index + 1 :
                             ].lstrip()
                             if (
-                                parameter_name.isdigit()
+                                parameter_name.isdecimal()
                                 and int(parameter_name) > 0
                             ):  # value contains "="
                                 parameter_name = int(parameter_name)
@@ -1997,7 +1997,7 @@ def tag_fn(ctx: "Wtp", token: str) -> None:
         # Give a warning on unsupported HTML tags.  WikiText limits the set of
         # tags that are allowed.
         if name not in ctx.allowed_html_tags:
-            if not name.isdigit() and not SILENT_HTML_LIKE:
+            if not name.isdecimal() and not SILENT_HTML_LIKE:
                 ctx.debug(
                     "html tag <{}{}> not allowed in WikiText".format(
                         name, "/" if also_end else ""
diff --git a/src/wikitextprocessor/parserfns.py b/src/wikitextprocessor/parserfns.py
index 99b0a62..3ca62fa 100644
--- a/src/wikitextprocessor/parserfns.py
+++ b/src/wikitextprocessor/parserfns.py
@@ -835,7 +835,7 @@ def ns_fn(
         return ""
     lc_arg = arg.lower()
     for key, ns in wtp.NAMESPACE_DATA.items():
-        if arg.isdigit() and ns["id"] == int(arg):
+        if arg.isdecimal() and ns["id"] == int(arg):
             return ns["name"]
         if ns["name"].lower() == lc_arg or lc_arg == key.lower():
             return ns["name"]
@@ -1122,8 +1122,8 @@ def padleft_fn(
     v = expander(args[0]) if args else ""
     cntstr = expander(args[1]).strip() if len(args) >= 2 else "0"
     pad = expander(args[2]) if len(args) >= 3 else "0"
-    if not cntstr.isdigit():
-        if cntstr.startswith("-") and cntstr[1:].isdigit():
+    if not cntstr.isdecimal():
+        if cntstr.startswith("-") and cntstr[1:].isdecimal():
             pass
         else:
             ctx.warning(
@@ -1147,9 +1147,9 @@ def padright_fn(
     v = expander(args[0]) if args else ""
     cntstr = expander(args[1]).strip() if len(args) >= 2 else "0"
     pad = expander(args[2]) if len(args) >= 3 else "0"
-    if not cntstr.isdigit():
+    if not cntstr.isdecimal():
         cnt = 0
-        if cntstr.startswith("-") and cntstr[1:].isdigit():
+        if cntstr.startswith("-") and cntstr[1:].isdecimal():
             pass
         else:
             ctx.warning(
@@ -1385,7 +1385,7 @@ def pos_fn(
     arg0 = expander(args[0]).strip() if args else ""
     arg1 = expander(args[1]) or " " if len(args) >= 2 else " "
     offsetstr = expander(args[2]).strip() if len(args) >= 3 else ""
-    if not offsetstr or not offsetstr.isdigit():
+    if not offsetstr or not offsetstr.isdecimal():
         offset = 0
     else:
         offset = int(offsetstr)
@@ -1402,7 +1402,7 @@ def rpos_fn(
     arg0 = expander(args[0]).strip() if args else ""
     arg1 = expander(args[1]) or " " if len(args) >= 2 else " "
     offsetstr = expander(args[2]).strip() if len(args) >= 3 else ""
-    if not offsetstr or not offsetstr.isdigit():
+    if not offsetstr or not offsetstr.isdecimal():
         offset = 0
     else:
         offset = int(offsetstr)
@@ -1445,7 +1445,7 @@ def pad_fn(
     cntstr = expander(args[1]).strip() if len(args) >= 2 else ""
     pad = expander(args[2]) if len(args) >= 3 and args[2] else "0"
     direction = expander(args[3]) if len(args) >= 4 else ""
-    if not cntstr.isdigit():
+    if not cntstr.isdecimal():
         ctx.warning(
             "pad length is not integer: {!r}".format(cntstr),
             sortid="parserfns/1133",
@@ -1973,7 +1973,7 @@ def call_parser_function(
             ofs = arg.find("=")
             if ofs >= 0:
                 k = arg[:ofs]
-                if k.isdigit():
+                if k.isdecimal():
                     k = int(k)
                 arg = arg[ofs + 1 :]
             else: