diff --git a/main.sh b/main.sh
index c1f69ba0..b1d4c964 100755
--- a/main.sh
+++ b/main.sh
@@ -164,6 +164,9 @@ fi
 for tool in "${tools[@]}"; do
     if [[ "${tool}" == *"@"* ]]; then
         version="${tool#*@}"
+        if [[ ! "${version}" =~ ^([1-9][0-9]*(\.[0-9]+(\.[0-9]+)?)?|0\.[1-9][0-9]*(\.[0-9]+)?|^0\.0\.[0-9]+)(-[0-9A-Za-z\.-]+)?(\+[0-9A-Za-z\.-]+)?$|^latest$ ]]; then
+            bail "takie-e/install-action does not support semver operators"
+        fi
     else
         version="latest"
     fi