diff --git a/tools/release.sh b/tools/release.sh
index dc08c1c4d9736c2530cd9f906aa452e82aabb80e..0b78246c95979361be61c37adc7c4be8d4ea51db 100755
--- a/tools/release.sh
+++ b/tools/release.sh
@@ -6,7 +6,7 @@ cd "$(dirname $0)/.."
 
 function set_version {
 	echo -n "Replacing version in source files to $1... "
-	sed -i "s/^\(\s*\)\(VERSION\|version\|release\|__version__\)\( *\)=\( *\)[\"'][0-9]\+\..\+[\"']\(,\?\)$/\1\2\3=\4'$1'\5/g" $(git ls-files -x contrib | grep -v "\.svg$")
+	 sed -i "s/^\(\s*\)\(VERSION\|version\|release\|__version__\)\( *\)=\( *\)\([\"']\?\)[0-9]\+\.[0-9a-z]\+\([\"']\?\)\(,\?\)$/\1\2\3=\4\5$1\6\7/g" $(git ls-files -x contrib | grep -v "\.svg$")
 	echo -e "done.\n"
 }