diff --git a/dev-lang/dafny-bin/Manifest b/dev-lang/dafny-bin/Manifest
index f0abe75712adb..17700d8cc0028 100644
--- a/dev-lang/dafny-bin/Manifest
+++ b/dev-lang/dafny-bin/Manifest
@@ -1,2 +1 @@
 DIST dafny-4.10.0-x64-ubuntu-20.04.zip 61352501 BLAKE2B 68227a1566e49a52b9159ab0d7ceaa4369fe0a2a18d97495b865b5d25507399a1e9753244fba19035231e4e0dd130881b0854479944479b8bed32c959c38a4ed SHA512 51929386f27841b4302b1e00865986b4aeea6205852ce7c90398a71a820dd334d3f71cf26255daf3a9a75fb4cc1bb84491165c77fd10ffaa35a267942294fd4b
-DIST dafny-4.9.1-x64-ubuntu-20.04.zip 60815385 BLAKE2B 76e4b7cf6bfea6f97bb04b77c034cf62732cc9fcadf1893f4783cf9e44cffc81f4067bbc001474b3b0a92f699b329f87ec77a2e34747a945d7786a33e6fff5b6 SHA512 37fdc7ab2f3feab6cce86103d57248e671daca91aead6588cb9f8de34e4b229178cb2da8bcc5bc26a45b85b76bb445c4c87c440d6e6a84409e2a3fdf7d34765f
diff --git a/dev-lang/dafny-bin/dafny-bin-4.9.1.ebuild b/dev-lang/dafny-bin/dafny-bin-4.9.1.ebuild
deleted file mode 100644
index 2e67e92be0df7..0000000000000
--- a/dev-lang/dafny-bin/dafny-bin-4.9.1.ebuild
+++ /dev/null
@@ -1,56 +0,0 @@
-# Copyright 1999-2025 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-DESCRIPTION="Verification-aware programming language"
-HOMEPAGE="https://dafny.org/
-	https://github.com/dafny-lang/dafny/"
-SRC_URI="https://github.com/dafny-lang/dafny/releases/download/v${PV}/dafny-${PV}-x64-ubuntu-20.04.zip"
-S="${WORKDIR}/dafny"
-
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="-* amd64"
-REQUIRED_USE="elibc_glibc"
-RESTRICT="strip"
-
-RDEPEND="
-	!dev-lang/dafny
-	dev-libs/userspace-rcu
-	dev-util/lttng-ust:0/2.12
-	sci-mathematics/z3
-"
-BDEPEND="
-	app-arch/unzip
-"
-
-QA_PREBUILT="*"
-
-src_prepare() {
-	default
-
-	# Remove bundled z3.
-	# NOTICE: New versions do not need the bundled one but older versions
-	# hardcoded the path relative to "dafny" binary.
-	# While bumping make sure to verify that system's "z3" is used
-	# by, for example, compiling/verifying a simple dafny program.
-	rm -r z3 || die
-}
-
-src_install() {
-	local dest="/opt/dafny"
-
-	insinto "${dest}"
-	# Maybe too general, but this installation mode matched how it arrives.
-	insopts -m0755
-	doins "${S}"/*
-
-	local bin
-	for bin in DafnyServer dafny ; do
-		dosym "../../${dest}/${bin}" "/usr/bin/${bin}"
-	done
-
-	# Make "dafny-server" clients happy.
-	dosym -r "/${dest}/DafnyServer" /usr/bin/dafny-server
-}