diff --git a/testbed/pyproject.toml b/testbed/pyproject.toml
index d5200b8457..35d5dc313f 100644
--- a/testbed/pyproject.toml
+++ b/testbed/pyproject.toml
@@ -9,7 +9,7 @@ test = [
     # fonttools is only needed by Android, but we need to use
     # sys.platform == 'linux' as there's no dependency identifier
     # that can target Android exclusively until 3.13 lands.
-    "fonttools==4.55.5 ; sys.platform == 'linux'",
+    "fonttools==4.55.6 ; sys.platform == 'linux'",
     "pillow==11.0.0",
     "pytest==8.3.4",
     "pytest-asyncio==0.25.2",