diff --git a/pyproject.toml b/pyproject.toml
index 9c630f6..b389c28 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ dependencies = [
     "snakemake-storage-plugin-http ~= 0.3",
     "tqdm-loggable ~= 0.2",
     "typing-extensions ~= 4.15",
+    "zstandard ~=0.25.0",
 ]
 classifiers = [
     "Development Status :: 4 - Beta",