diff --git a/02-topgrade.sh b/02-topgrade.sh
index e81e524..2a39c57 100644
--- a/02-topgrade.sh
+++ b/02-topgrade.sh
@@ -29,7 +29,7 @@ fi
 if [ ! -f "$topgrade_binary" ]; then
   echo "** topgrade binary not present at $topgrade_binary"
 else
-  current_version=$($topgrade_binary --version | sed 's/[^0-9]*//g')
+  current_version=$($topgrade_binary --version | sed 's/[A-Za-z]*//g')
   echo $current_version
   newest_release=$(curl -sL https://api.github.com/repos/$topgrade_git_owner/$topgrade_git_repo/releases/latest | jq -r ".tag_name" | sed 's/[A-Za-z]*//g')
   echo $newest_release