diff --git a/requirements.txt b/requirements.txt
index 6741fa2..0b3d819 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 click
 jinja2
 lxml
-uniseg >= 0.8.0
+uniseg >= 0.9.1
 numpy
 colorama
 MarkupSafe
diff --git a/src/dinglehopper/word_error_rate.py b/src/dinglehopper/word_error_rate.py
index 578850f..ec039b3 100644
--- a/src/dinglehopper/word_error_rate.py
+++ b/src/dinglehopper/word_error_rate.py
@@ -22,11 +22,11 @@ def patch_word_break():
     """
     old_word_break = uniseg.wordbreak.word_break
 
-    def new_word_break(c, index=0):
+    def new_word_break(c):
         if 0xE000 <= ord(c) <= 0xF8FF:  # Private Use Area
-            return uniseg.wordbreak.WordBreak.ALETTER
+            return uniseg.wordbreak.Word_Break.ALetter
         else:
-            return old_word_break(c, index)
+            return old_word_break(c)
 
     uniseg.wordbreak.word_break = new_word_break
     global word_break_patched