diff --git a/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetOTPDialogFragment.kt b/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetOTPDialogFragment.kt
index 77b18d107..26c769afb 100644
--- a/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetOTPDialogFragment.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetOTPDialogFragment.kt
@@ -309,7 +309,7 @@ class SetOTPDialogFragment : DatabaseDialogFragment() {
             override fun afterTextChanged(s: Editable?) {
                 s?.toString()?.let { userString ->
                     try {
-                        mOtpElement.setBase32Secret(userString.toUpperCase(Locale.ENGLISH))
+                        mOtpElement.setBase32Secret(userString.uppercase(Locale.ENGLISH))
                         otpSecretContainer?.error = null
                     } catch (exception: Exception) {
                         otpSecretContainer?.error = getString(R.string.error_otp_secret_key)
diff --git a/app/src/main/java/com/kunzisoft/keepass/autofill/StructureParser.kt b/app/src/main/java/com/kunzisoft/keepass/autofill/StructureParser.kt
index e10ebf9a3..760a09e92 100644
--- a/app/src/main/java/com/kunzisoft/keepass/autofill/StructureParser.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/autofill/StructureParser.kt
@@ -272,12 +272,12 @@ class StructureParser(private val structure: AssistStructure) {
     private fun parseNodeByHtmlAttributes(node: AssistStructure.ViewNode): Boolean {
         val autofillId = node.autofillId
         val nodHtml = node.htmlInfo
-        when (nodHtml?.tag?.toLowerCase(Locale.ENGLISH)) {
+        when (nodHtml?.tag?.lowercase(Locale.ENGLISH)) {
             "input" -> {
                 nodHtml.attributes?.forEach { pairAttribute ->
-                    when (pairAttribute.first.toLowerCase(Locale.ENGLISH)) {
+                    when (pairAttribute.first.lowercase(Locale.ENGLISH)) {
                         "type" -> {
-                            when (pairAttribute.second.toLowerCase(Locale.ENGLISH)) {
+                            when (pairAttribute.second.lowercase(Locale.ENGLISH)) {
                                 "tel", "email" -> {
                                     result?.usernameId = autofillId
                                     result?.usernameValue = node.autofillValue
diff --git a/app/src/main/java/com/kunzisoft/keepass/database/cursor/EntryCursor.kt b/app/src/main/java/com/kunzisoft/keepass/database/cursor/EntryCursor.kt
index 84c1eaffb..986802a02 100644
--- a/app/src/main/java/com/kunzisoft/keepass/database/cursor/EntryCursor.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/database/cursor/EntryCursor.kt
@@ -68,7 +68,7 @@ abstract class EntryCursor<EntryId, PwEntryV : EntryVersioned<*, EntryId, *, *>>
         pwEntry.notes = getString(getColumnIndex(COLUMN_INDEX_NOTES))
         pwEntry.expiryTime = DateInstant(getString(getColumnIndex(COLUMN_INDEX_EXPIRY_TIME)))
         pwEntry.expires = getString(getColumnIndex(COLUMN_INDEX_EXPIRES))
-                                        .toLowerCase(Locale.ENGLISH) != "false"
+                                        .lowercase(Locale.ENGLISH) != "false"
     }
 
     companion object {
diff --git a/app/src/main/java/com/kunzisoft/keepass/otp/OtpElement.kt b/app/src/main/java/com/kunzisoft/keepass/otp/OtpElement.kt
index d07ace49f..eef173567 100644
--- a/app/src/main/java/com/kunzisoft/keepass/otp/OtpElement.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/otp/OtpElement.kt
@@ -234,7 +234,7 @@ data class OtpElement(var otpModel: OtpModel = OtpModel()) {
 
         fun replaceBase32Chars(parameter: String): String {
             // Add padding '=' at end if not Base32 length
-            var parameterNewSize = parameter.toUpperCase(Locale.ENGLISH).removeSpaceChars()
+            var parameterNewSize = parameter.uppercase(Locale.ENGLISH).removeSpaceChars()
             while (parameterNewSize.length % 8 != 0) {
                 parameterNewSize += '='
             }
@@ -264,7 +264,7 @@ enum class OtpTokenType {
 
     companion object {
         fun getFromString(tokenType: String): OtpTokenType {
-            return when (tokenType.toLowerCase(Locale.ENGLISH)) {
+            return when (tokenType.lowercase(Locale.ENGLISH)) {
                 "s", "steam" -> STEAM
                 "hotp" -> RFC4226
                 else -> RFC6238
diff --git a/app/src/main/java/com/kunzisoft/keepass/otp/OtpEntryFields.kt b/app/src/main/java/com/kunzisoft/keepass/otp/OtpEntryFields.kt
index a4cd13279..ba8090cbd 100644
--- a/app/src/main/java/com/kunzisoft/keepass/otp/OtpEntryFields.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/otp/OtpEntryFields.kt
@@ -143,7 +143,7 @@ object OtpEntryFields {
         if (otpPlainText != null && otpPlainText.isNotEmpty() && isOTPUri(otpPlainText)) {
             val uri = Uri.parse(otpPlainText.removeSpaceChars())
 
-            if (uri.scheme == null || OTP_SCHEME != uri.scheme!!.toLowerCase(Locale.ENGLISH)) {
+            if (uri.scheme == null || OTP_SCHEME != uri.scheme!!.lowercase(Locale.ENGLISH)) {
                 Log.e(TAG, "Invalid or missing scheme in uri")
                 return false
             }
@@ -309,7 +309,7 @@ object OtpEntryFields {
             }
             if (algorithmField != null) {
                 otpElement.algorithm =
-                        when (algorithmField.toUpperCase(Locale.ENGLISH)) {
+                        when (algorithmField.uppercase(Locale.ENGLISH)) {
                             TIMEOTP_ALGORITHM_SHA1_VALUE -> HashAlgorithm.SHA1
                             TIMEOTP_ALGORITHM_SHA256_VALUE -> HashAlgorithm.SHA256
                             TIMEOTP_ALGORITHM_SHA512_VALUE -> HashAlgorithm.SHA512
@@ -417,7 +417,7 @@ object OtpEntryFields {
         val output = HashMap<String, String>()
         for (element in elements) {
             val pair = element.split("=".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
-            output[pair[0].toLowerCase(Locale.ENGLISH)] = pair[1]
+            output[pair[0].lowercase(Locale.ENGLISH)] = pair[1]
         }
         return output
     }
diff --git a/app/src/main/java/com/kunzisoft/keepass/utils/UriUtil.kt b/app/src/main/java/com/kunzisoft/keepass/utils/UriUtil.kt
index dada5bb1d..71e50ff3e 100644
--- a/app/src/main/java/com/kunzisoft/keepass/utils/UriUtil.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/utils/UriUtil.kt
@@ -86,7 +86,7 @@ object UriUtil {
 
     private fun isFileScheme(fileUri: Uri): Boolean {
         val scheme = fileUri.scheme
-        if (scheme == null || scheme.isEmpty() || scheme.toLowerCase(Locale.ENGLISH) == "file") {
+        if (scheme == null || scheme.isEmpty() || scheme.lowercase(Locale.ENGLISH) == "file") {
             return true
         }
         return false
@@ -94,7 +94,7 @@ object UriUtil {
 
     private fun isContentScheme(fileUri: Uri): Boolean {
         val scheme = fileUri.scheme
-        if (scheme != null && scheme.toLowerCase(Locale.ENGLISH) == "content") {
+        if (scheme != null && scheme.lowercase(Locale.ENGLISH) == "content") {
             return true
         }
         return false