diff --git a/run b/run
index 9094ed3..bd7c761 100755
--- a/run
+++ b/run
@@ -566,6 +566,26 @@ step24() {
   }
 }
 
+# commit a5c910adb610ae530db99f10aa77aaed3e85e830
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   Thu Apr 13 21:44:40 2023 -0700
+#
+#     change semantics of `@memcpy` and `@memset`
+#
+STEP25=a5c910adb610ae530db99f10aa77aaed3e85e830
+STEP25_=0.10.0-2825-ga5c910adb6
+step25() {
+  rm -fr "../zig-$STEP25_"
+  git archive --prefix=zig-$STEP25_/ $STEP25 | tar -C .. -x
+  git archive --prefix=zig-$STEP25_/ $STEP25~1 lib | tar -C .. -x
+  {
+    pushd "../zig-$STEP25_"
+    cp ../zig-$STEP24_/stage1/zig1.wasm stage1/zig1.wasm
+    halfbuild 16
+    popd
+  }
+}
+
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   set -xeuo pipefail
   step=${1:-step00}
@@ -597,4 +617,5 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   if [[ "$step" -le 22 ]]; then step22; fi
   if [[ "$step" -le 23 ]]; then step23; fi
   if [[ "$step" -le 24 ]]; then step24; fi
+  if [[ "$step" -le 25 ]]; then step25; fi
 fi