diff --git a/RedPandaIDE/compiler/compiler.cpp b/RedPandaIDE/compiler/compiler.cpp
index 97234fb2..2f7151fb 100644
--- a/RedPandaIDE/compiler/compiler.cpp
+++ b/RedPandaIDE/compiler/compiler.cpp
@@ -148,7 +148,7 @@ int Compiler::getLineNumberFromOutputLine(QString &line)
         pos = line.indexOf(',');
     }
     if (pos>=0) {
-        result = line.midRef(0,pos).toInt();
+        result = QStringView(line.data(), pos).toInt();
         if (result > 0)
             line.remove(0,pos+1);
     } else {
@@ -168,7 +168,7 @@ int Compiler::getColunmnFromOutputLine(QString &line)
         pos = line.indexOf(',');
     }
     if (pos>=0) {
-        result = line.midRef(0,pos).toInt();
+        result = QStringView(line.data(), pos).toInt();
         if (result > 0)
             line.remove(0,pos+1);
     }
diff --git a/RedPandaIDE/parser/cppparser.cpp b/RedPandaIDE/parser/cppparser.cpp
index 887f2844..aed6dee4 100644
--- a/RedPandaIDE/parser/cppparser.cpp
+++ b/RedPandaIDE/parser/cppparser.cpp
@@ -3449,7 +3449,7 @@ void CppParser::handlePreprocessor()
 
             // Mention progress to user if we enter a NEW file
             bool ok;
-            int line = s.midRef(delimPos+1).toInt(&ok);
+            int line = QStringView(s.begin() + delimPos + 1, s.end()).toInt(&ok);
             if (line == 1) {
                 mFilesScannedCount++;
                 mFilesToScanCount++;
diff --git a/RedPandaIDE/parser/cpppreprocessor.cpp b/RedPandaIDE/parser/cpppreprocessor.cpp
index 2feac9d9..97c2c8e4 100644
--- a/RedPandaIDE/parser/cpppreprocessor.cpp
+++ b/RedPandaIDE/parser/cpppreprocessor.cpp
@@ -1037,7 +1037,7 @@ QStringList CppPreprocessor::removeComments(const QStringList &text)
                     currentType=ContentType::Other;
                     break;
                 case ContentType::RawString:
-                    if (line.midRef(0,pos).endsWith(')'+delimiter))
+                    if (QStringView(line.data(), pos).endsWith(')'+delimiter))
                         currentType = ContentType::Other;
                     break;
                 case ContentType::Other:
diff --git a/RedPandaIDE/parser/cpptokenizer.cpp b/RedPandaIDE/parser/cpptokenizer.cpp
index 9adf1284..f317ef7c 100644
--- a/RedPandaIDE/parser/cpptokenizer.cpp
+++ b/RedPandaIDE/parser/cpptokenizer.cpp
@@ -194,7 +194,7 @@ QString CppTokenizer::getNextToken(TokenType *pTokenType)
                 int delimPos = result.lastIndexOf(':');
                 if (delimPos >= 0) {
                     bool ok;
-                    mCurrentLine = result.midRef(delimPos+1).toInt(&ok)-1; // fCurrLine is 0 based
+                    mCurrentLine = QStringView(result.begin() + delimPos + 1, result.end()).toInt(&ok)-1; // fCurrLine is 0 based
                 }
             }
             done = (result != "");
diff --git a/RedPandaIDE/widgets/qconsole.cpp b/RedPandaIDE/widgets/qconsole.cpp
index 0e0a9a4f..ce2399eb 100644
--- a/RedPandaIDE/widgets/qconsole.cpp
+++ b/RedPandaIDE/widgets/qconsole.cpp
@@ -252,7 +252,7 @@ QString QConsole::selText()
         QString s = mContents.getLine(Last);
         if (Last == mContents.lines())
             s+= this->mCommand;
-        result += s.leftRef(ColTo);
+        result.append(s.data(), ColTo);
         return result;
     }
 }
diff --git a/libs/qsynedit/qsynedit/qsynedit.cpp b/libs/qsynedit/qsynedit/qsynedit.cpp
index fbec9aa5..d76d3386 100644
--- a/libs/qsynedit/qsynedit/qsynedit.cpp
+++ b/libs/qsynedit/qsynedit/qsynedit.cpp
@@ -4497,7 +4497,8 @@ QString QSynEdit::selText() const
                     result += mDocument->getLine(i);
                     result+=lineBreak();
                 }
-                result += mDocument->getLine(lastLine).leftRef(charTo-1);
+                const QString &line = mDocument->getLine(lastLine);
+                result.append(line.data(), charTo-1);
                 return result;
             }
         }