diff --git a/pyproject.toml b/pyproject.toml
index 3aa7528ca..6bc15d3c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,6 +68,7 @@ dependencies = [
     "GitPython>=3.1.41", # for logging
     "datasets>=4.0.0",
     "pydantic",
+    "pillow",
     "numpy>=2",  # pinned to avoid incompatibilities
     "hf-xet>=1.1.8",  # pinned to avoid failing test suite
     # Prettiness