diff --git a/itn/chinese/data/measure/units_zh.tsv b/itn/chinese/data/measure/units_zh.tsv
index 767307f..b227173 100644
--- a/itn/chinese/data/measure/units_zh.tsv
+++ b/itn/chinese/data/measure/units_zh.tsv
@@ -12,7 +12,6 @@
 艘
 套
 段
-号
 匹
 张
 座
diff --git a/itn/chinese/rules/cardinal.py b/itn/chinese/rules/cardinal.py
index 811cebc..0a5c683 100644
--- a/itn/chinese/rules/cardinal.py
+++ b/itn/chinese/rules/cardinal.py
@@ -116,7 +116,7 @@ def build_tagger(self):
         # float number like 1.11
         cardinal |= (number + dot + digits.plus)
         # cardinal string like 110 or 12306 or 13125617878, used in phone
-        cardinal |= (digits**3 | digits**5 | digits**11)
+        cardinal |= (digits**3 | digits**4 | digits**5 | digits**11)
         # cardinal string like 23
         if self.enable_standalone_number:
             if self.enable_0_to_9:
diff --git a/requirements.txt b/requirements.txt
index 8fb727c..9adbf8f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 flake8
 importlib_resources
-pynini
+pynini==2.1.5
 pytest