diff --git a/pyproject.toml b/pyproject.toml
index 8404869..e22a983 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,6 +39,7 @@ repository = "https://github.com/fox-it/dissect.hypervisor"
 [project.optional-dependencies]
 full = [
     "pycryptodome",
+    "zstandard",
 ]
 dev = [
     "dissect.hypervisor[full]",