diff --git a/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/OS.kt b/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/OS.kt
index 0c275e7365..aa8fdc8e76 100644
--- a/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/OS.kt
+++ b/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/OS.kt
@@ -7,7 +7,7 @@ enum class OS {
 }
 
 fun getOS(): OS {
-    val osName = System.getProperty("os.name").lowercase(Locale.US)
+    val osName = System.getProperty("os.name").toLowerCase(Locale.US)
     if (isLinux(osName)) {
         return OS.LINUX
     } else if (isMacOs(osName)) {
diff --git a/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/PgpFingerprint.kt b/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/PgpFingerprint.kt
index c50594032c..3c08588cf6 100644
--- a/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/PgpFingerprint.kt
+++ b/wallets/bitcoind/build-logic/gradle-tasks/src/main/kotlin/bisq/gradle/tasks/PgpFingerprint.kt
@@ -3,5 +3,5 @@ package bisq.gradle.tasks
 object PgpFingerprint {
     fun normalize(fingerprint: String): String =
         fingerprint.filterNot { it.isWhitespace() }  // Remove all spaces
-                .lowercase()
+                .toLowerCase()
 }
\ No newline at end of file