diff --git a/sci-libs/proj/proj-8.1.0.ebuild b/sci-libs/proj/proj-8.1.0-r1.ebuild
similarity index 99%
rename from sci-libs/proj/proj-8.1.0.ebuild
rename to sci-libs/proj/proj-8.1.0-r1.ebuild
index 2cc1d671a0068..501de56a4e628 100644
--- a/sci-libs/proj/proj-8.1.0.ebuild
+++ b/sci-libs/proj/proj-8.1.0-r1.ebuild
@@ -17,7 +17,7 @@ SRC_URI="
 "
 
 LICENSE="MIT"
-SLOT="0/22"
+SLOT="0/23"
 KEYWORDS="~amd64 ~arm ~arm64 ~ia64 ~ppc ~ppc64 ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos"
 IUSE="curl europe test +tiff"
 REQUIRED_USE="test? ( !europe )"