diff --git a/requirements.txt b/requirements.txt
index 851fec1..8f863cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 click
 jinja2
 lxml
-uniseg >= 0.7.2
+uniseg >= 0.8.0
 numpy
 colorama
 MarkupSafe
diff --git a/src/dinglehopper/word_error_rate.py b/src/dinglehopper/word_error_rate.py
index b6e0a3a..b759a69 100644
--- a/src/dinglehopper/word_error_rate.py
+++ b/src/dinglehopper/word_error_rate.py
@@ -24,7 +24,7 @@ def patch_word_break():
 
     def new_word_break(c, index=0):
         if 0xE000 <= ord(c) <= 0xF8FF:  # Private Use Area
-            return "ALetter"
+            return uniseg.wordbreak.WordBreak.ALETTER
         else:
             return old_word_break(c, index)