compare operator

Using one compare operator is better in shell.
In bash it seems to doesn't matter, but shell throws a error here
scripts/update.sh: 14: [: 2.5.5: unexpected operator

scripts/update.sh

@@ -11,7 +11,7 @@ echo "Searching for updates..."
 git fetch --tags origin
 latestTag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
 
-if [ "$currentVersion" == "$latestTag" ]; then
+if [ "$currentVersion" = "$latestTag" ]; then
   echo "\nYou already have the latest version."
 else
   echo "\nUpdating $currentVersion to $latestTag..."