diff --git a/profiles/package.mask b/profiles/package.mask
index 7213c5eba1447..e800e2cd368f8 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -36,6 +36,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Eli Schwartz <eschwartz@gentoo.org> (2025-11-30)
+# Abandoned and unmaintained. It existed solely as a test dep for
+# dev-python/sphinx-rtd-theme, which no longer uses it, so nobody should
+# have it installed anyway.
+# Removal on 2025-12-30.  Bugs #966396, #963998.
+dev-python/readthedocs-sphinx-ext
+
 # Andreas Sturmlechner <asturm@gentoo.org> (2025-11-27)
 # Depends on Qt5, upstream needs help with porting. Bug #956453
 # Removal on 2025-12-27.