diff --git a/sha1collisiondetection.changes b/sha1collisiondetection.changes
index d83d332..4e54dc5 100644
--- a/sha1collisiondetection.changes
+++ b/sha1collisiondetection.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Feb 26 13:08:29 UTC 2024 - Dominique Leuenberger <dimstar@opensuse.org>
+
+- Use %patch -P N instead of deprecated %patchN.
+
 -------------------------------------------------------------------
 Wed Jan 31 17:48:45 CET 2018 - ro@suse.de
 
diff --git a/sha1collisiondetection.spec b/sha1collisiondetection.spec
index 6c6177a..148a711 100644
--- a/sha1collisiondetection.spec
+++ b/sha1collisiondetection.spec
@@ -59,8 +59,8 @@ It is very fast and takes less than twice the amount of time as regular SHA-1.
 
 %prep
 %setup -q -n %{name}-stable-v%{version}
-%patch0 -p1
-%patch1
+%patch -P 0 -p1
+%patch -P 1
 
 %build
 export TARGETCFLAGS="%{optflags}"