diff --git a/pyproject.toml b/pyproject.toml
index b283eca6..191c841a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
     "packaging",
 ]
 
-[optional-dependencies]
+[project.optional-dependencies]
 snappy = ["cramjam"]
 lz4 = ["lz4 >=3.1.3"]
 zstd = ["cramjam"]