diff --git a/sci-electronics/sby/Manifest b/sci-electronics/sby/Manifest
index 93ca970da9..f7ea2b28e2 100644
--- a/sci-electronics/sby/Manifest
+++ b/sci-electronics/sby/Manifest
@@ -1,2 +1 @@
-DIST sby-0.64.tar.gz 178460 BLAKE2B 3cdda81a75f8a5921162c74a3e425af1e9d5f5cdabf704a27e50ca65fee4dd01d39cd68886051d608e7e4d9e8380b4ad2235b77f58654335e623bf2cb0049968 SHA512 566c87cf2d30a293d318fc1fe6ea25cdea6c0d3f1eb95df438d26875dba87466f23b70d9a3a7aab60322a75c228cc07a4d65f0cfdc5c8c87726f2947c20a2c41
 DIST sby-0.66.tar.gz 178479 BLAKE2B dddb67985bb35d64d77847d793d9c283eac90fe4ab75e2bb00b693709d3fea7d04cd5a7c0c39ec2e874bd896910e89b60dcca039d81471cbba3b3d2407b3c46a SHA512 1a1c7e4bdc8dbe66b6cd5ff2d9ed846ef196e26773f6e98f6088df753c0f49e4408ae1ddb3a0b244ad596fd2d2119a98d1026e12343f16238847f6802eb12835
diff --git a/sci-electronics/sby/sby-0.64.ebuild b/sci-electronics/sby/sby-0.64.ebuild
deleted file mode 100644
index a73356ea4b..0000000000
--- a/sci-electronics/sby/sby-0.64.ebuild
+++ /dev/null
@@ -1,64 +0,0 @@
-# Copyright 2025 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-PYTHON_COMPAT=( python3_{11..14} )
-
-inherit python-single-r1
-
-DESCRIPTION="Front-end for Yosys-based formal hardware verification flows"
-HOMEPAGE="https://github.com/YosysHQ/sby"
-SRC_URI="https://github.com/YosysHQ/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
-
-LICENSE="ISC"
-SLOT="0"
-KEYWORDS="~amd64"
-IUSE="test yices2"
-REQUIRED_USE="${PYTHON_REQUIRED_USE}"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	${PYTHON_DEPS}
-	$(python_gen_cond_dep '
-		dev-python/click[${PYTHON_USEDEP}]
-	')
-	sci-electronics/yosys
-	sci-mathematics/z3
-	yices2? ( sci-mathematics/yices2 )
-"
-DEPEND="${RDEPEND}"
-BDEPEND="
-	test? (
-		$(python_gen_cond_dep '
-			dev-python/xmlschema[${PYTHON_USEDEP}]
-		')
-	)
-"
-
-src_test() {
-	# Upstream tests race under parallel make (concurrent sqlite WAL access
-	# to shared status_db). Force serial execution.
-	emake -j1 -C tests test
-}
-
-src_install() {
-	# Install Python modules to yosys shared directory
-	insinto /usr/share/yosys/python3
-	doins sbysrc/sby_*.py
-
-	# Install sby_core.py with program prefix substitution
-	sed -e 's|##yosys-program-prefix##|""|' \
-		sbysrc/sby_core.py > "${T}/sby_core.py" || die
-	doins "${T}/sby_core.py"
-
-	# Create the sby launcher script with path and version substitutions
-	# Use absolute path with EPREFIX because python-exec wrapper changes script location
-	local syspath="sys.path += [\"${EPREFIX}/usr/share/yosys/python3\"]"
-	sed -e "s|##yosys-sys-path##|${syspath}|" \
-		-e "s|##yosys-release-version##|release_version = 'SBY ${PV}'|" \
-		sbysrc/sby.py > "${T}/sby" || die
-	python_newscript "${T}/sby" sby
-
-	dodoc README.md
-}