diff --git a/update.sh b/update.sh
index aa3805a..d6e9a86 100755
--- a/update.sh
+++ b/update.sh
@@ -56,7 +56,6 @@ function create_variant() {
 	mkdir -p "$dir"
 
         template="Dockerfile-${base[$variant]}.template"
-        rm -f "$dir/Dockerfile"
         echo "# DO NOT EDIT: created by update.sh from $template" > "$dir/Dockerfile"
 	cat "$template" >> "$dir/Dockerfile"
 
@@ -74,8 +73,6 @@ function create_variant() {
 		s/%%MEMCACHED_VERSION%%/'"${pecl_versions[memcached]}"'/g;
 		s/%%REDIS_VERSION%%/'"${pecl_versions[redis]}"'/g;
 	' "$dir/Dockerfile"
-        # remove write permission as a reminder this file must be modified with this script
-        chmod -w "$dir/Dockerfile"
 
 	# Copy the shell scripts
 	for name in entrypoint cron; do