diff --git a/profiles/package.mask b/profiles/package.mask
index c64250eca9..ffa1ad2c83 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -18,6 +18,20 @@
 
 # New entries go on top.
 
+# Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in> (2025-11-06)
+# Unmaintained Crystal library with no revdeps left.
+# Removal on 2025-12-06.
+dev-crystal/kilt
+dev-crystal/crikey
+dev-crystal/crustache
+dev-crystal/inflector
+dev-crystal/jbuilder
+dev-crystal/json_mapping
+dev-crystal/liquid
+dev-crystal/slang
+dev-crystal/temel
+dev-crystal/water
+
 # Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in> (2025-10-27)
 # Depends on masked dev-python/rst2ansi.
 app-backup/b2