diff --git a/run b/run
index 4e2a58a..9094ed3 100755
--- a/run
+++ b/run
@@ -540,6 +540,28 @@ step23() {
     pushd "../zig-$STEP23_"
     cp ../zig-$STEP22_/stage1/zig1.wasm stage1/zig1.wasm
     halfbuild 16
+    build/zig2 build update-zig1
+    popd
+  }
+}
+
+# commit 35d82d31be3d2f2611049f41dc2616f898d70871
+# Author: Matthew Lugg <mlugg@mlugg.co.uk>
+# Date:   2023-04-15T00:32:31+03:00
+#
+#     Add `@inComptime` builtin
+#
+STEP24=35d82d31be3d2f2611049f41dc2616f898d70871
+STEP24_=0.10.0-2797-g35d82d31be
+step24() {
+  rm -fr "../zig-$STEP24_"
+  git archive --prefix=zig-$STEP24_/ $STEP24 | tar -C .. -x
+  git archive --prefix=zig-$STEP24_/ $STEP24~1 lib | tar -C .. -x
+  {
+    pushd "../zig-$STEP24_"
+    cp ../zig-$STEP23_/stage1/zig1.wasm stage1/zig1.wasm
+    halfbuild 16
+    build/zig2 build update-zig1
     popd
   }
 }
@@ -574,4 +596,5 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   if [[ "$step" -le 21 ]]; then step21; fi
   if [[ "$step" -le 22 ]]; then step22; fi
   if [[ "$step" -le 23 ]]; then step23; fi
+  if [[ "$step" -le 24 ]]; then step24; fi
 fi