diff --git a/pyproject.toml b/pyproject.toml
index 3f290ba..b3dccfe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ dependencies = [
 	"pytest-flakes",
 	"pytest-ruff",
 	"pytidylib",
-	"dc-design-system @ https://github.com/DemocracyClub/design-system/archive/refs/tags/0.4.6.zip", 
+	"dc-design-system @ https://github.com/DemocracyClub/design-system/archive/refs/tags/0.4.6.zip#sha1=c2c9b5b45ce51e0be38156fffbe04cb8f886c43d", 
 	"whitenoise",
 	"pysass",
 	"jsmin<3.1",