diff --git a/tools/update-simplecpp.sh b/tools/update-simplecpp.sh
new file mode 100755
index 00000000000..08d291f203b
--- /dev/null
+++ b/tools/update-simplecpp.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+
+set -e
+
+files=(simplecpp.cpp simplecpp.h)
+simplecpp_url="git@github.com:danmar/simplecpp.git"
+commit_message_format="simplecpp: bump to %s"
+cppcheck_dir="$(dirname "$(realpath --no-symlinks "${BASH_SOURCE[@]}")")/.."
+
+tag="$1"
+simplecpp_dir="$2"
+
+[ -z "$tag" ] && {
+	>&2 echo "Usage: $0 <tag> [checked out simplecpp repo]"
+	exit 1
+}
+
+# Clone simplecpp if checked out repo was not provided
+[ -z "$simplecpp_dir" ] && {
+	simplecpp_dir="$(mktemp -d)"
+	git clone "$simplecpp_url" "$simplecpp_dir"
+}
+
+# Checkout tag
+git -C "$simplecpp_dir" -c advice.detachedHead=false checkout "$tag"
+
+# Make sure tag is on the master branch
+git -C "$simplecpp_dir" merge-base --is-ancestor "$tag" master || {
+	>&2 echo "Tag $tag is not on the master branch"
+	exit 1
+}
+
+# Make sure we don't commit any other files
+git -C "$cppcheck_dir" reset --mixed
+
+# Copy and stage files
+for file in "${files[@]}"; do
+	source="$simplecpp_dir/$file"
+	dest="$cppcheck_dir/externals/simplecpp/$file"
+	cp "$source" "$dest"
+	git -C "$cppcheck_dir" add "$dest"
+done
+
+# Create commit
+commit_message="$(printf "$commit_message_format" "$tag")"
+git -C "$cppcheck_dir" commit -m "$commit_message"