diff --git a/profiles/package.mask b/profiles/package.mask
index 81f90dccaf..ae939713cb 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -18,6 +18,11 @@
 
 # New entries go on top.
 
+# Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in> (2025-05-01)
+# Unmaintained in GURU, no revdeps left. Open bugs: #856874.
+# Removal on 2025-06-01.
+dev-python/sse-starlette
+
 # Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in> (2025-05-01)
 # Unmaintained in GURU, no revdeps left. Open bugs: #928254.
 # Removal on 2025-06-01.