diff --git a/requirements.txt b/requirements.txt
index 47f7b67..d29e09c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,8 @@ numba
 numpy
 pytest
 PyYAML
-swiftsimio
+swiftsimio>=6.0.0
 unyt
 tqdm
-p_tqdm
\ No newline at end of file
+p_tqdm
+velociraptor>=0.15.6