diff --git a/.github/workflows/update_omada.yml b/.github/workflows/update_omada.yml
index df1e902..9fb8fcc 100644
--- a/.github/workflows/update_omada.yml
+++ b/.github/workflows/update_omada.yml
@@ -18,12 +18,12 @@ jobs:
           TARGET="https://static.tp-link.com/upload/software/.*.gz"
 
           latest_url=$(curl -s $URL | grep -om1 "${TARGET}")
-          latest_version=$(echo $latest_url | grep -o "[0-9]\.[0-9]\.[0-9][0-9]\?")
+          latest_version=$(echo $latest_url | grep -o "[0-9]\{1,2\}\.[0-9]\{1,2\}\.[0-9]\{1,2\}")
           echo "latest_url=$latest_url" >>$GITHUB_OUTPUT
           echo "latest_version=$latest_version" >>$GITHUB_OUTPUT
 
           current_url=$(<omada.url)
-          current_version=$(grep -o "[0-9]\.[0-9]\.[0-9][0-9]\?" omada.url)
+          current_version=$(grep -o "[0-9]\{1,2\}\.[0-9]\{1,2\}\.[0-9]\{1,2\}" omada.url)
           echo "current_url=$current_url" >>$GITHUB_OUTPUT
           echo "current_version=$current_version" >>$GITHUB_OUTPUT