diff --git a/scripts/bump.sh b/scripts/bump.sh
index 1e19c83..04a9616 100755
--- a/scripts/bump.sh
+++ b/scripts/bump.sh
@@ -9,7 +9,7 @@ fi
 
 VERSION=$1
 
-if ! echo $VERSION | grep "^[0-9.]"; then
+if ! echo $VERSION | grep -q "^[0-9.]-?.*?$"; then
     echo "invalid version";
     exit 1
 fi