diff --git a/build.gradle.kts b/build.gradle.kts
index 6c1b59163..2ade9a6ee 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,8 +12,8 @@ plugins {
 }
 
 fun isNonStable(version: String): Boolean {
-  val stableKeyword = listOf("RELEASE", "FINAL", "GA").any { version.toUpperCase().contains(it) }
-  val unstableKeyword = listOf("ALPHA", "RC").any { version.toUpperCase().contains(it) }
+  val stableKeyword = listOf("RELEASE", "FINAL", "GA").any { version.uppercase().contains(it) }
+  val unstableKeyword = listOf("ALPHA", "RC").any { version.uppercase().contains(it) }
   val regex = "^[0-9,.v-]+(-r)?$".toRegex()
   val isStable = stableKeyword || regex.matches(version)
   return unstableKeyword || !isStable