diff --git a/commit.sh b/commit.sh
index ab4f3b2..38fe7ba 100644
--- a/commit.sh
+++ b/commit.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # usage ./commit.sh https://username:password@git.domain.tld/username/repo.git
 git clone $1 target
@@ -8,7 +8,7 @@ git config user.email "10000@daihan.me"
 git config user.name "Han Dai"
 
 wget https://gitea.dennx.com/api/v1/users/dennydai/heatmap -O heatmap
-heatmap=$(cat heatmap | grep -Po [0-9]+)
+heatmap=$(cat heatmap | grep -Eo [0-9]+)
 
 mkdir -p history