diff --git a/pyproject.toml b/pyproject.toml
index dcb4ddf1f4..84f3458867 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dependencies = [
   "celery==5.6.*",
   "chardet==5.2.*",
   "cryptography>=49.0.0",
-  "css-inline==0.20.*",
+  "css-inline==0.21.*",
   "defusedcsv>=3.0.0",
   "dnspython==2.*",
   "Django[argon2]==5.2.*",