diff --git a/NEWS.md b/NEWS.md
index 5ad22440..94b8d5b0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -25,10 +25,11 @@ Red Panda C++ Version 2.4
   - fix: &operator= functions are not correctly parsed;
   - fix: Code Formatter's "add indent to continueous lines" option is not correctly saved.
   - fix: _Pragma is not correctly handled;
+  - enhancement: improve parse result for STL <random>
   - change:  the default value for UI font size : 11
   - change:  the default value for add leading zeros to line numbers : false
-
-
+  - upgrade integrated libturtle. fix: nothing is drawed when set background color to BLACK
+  - upgrade integrate fmtlib. fix: imcompatible with GBK encoding
 
 Red Panda C++ Version 2.3
 
diff --git a/RedPandaIDE/parser/cppparser.cpp b/RedPandaIDE/parser/cppparser.cpp
index c0caf747..4388a23a 100644
--- a/RedPandaIDE/parser/cppparser.cpp
+++ b/RedPandaIDE/parser/cppparser.cpp
@@ -1457,7 +1457,7 @@ void CppParser::addSoloScopeLevel(PStatement& statement, int line, bool shouldRe
         mClassScope = StatementClassScope::Public; // structs are public by default
     mCurrentClassScope.append(mClassScope);
 #ifdef QT_DEBUG
-    //if (mCurrentClassScope.count()==1)
+//    if (mCurrentClassScope.count()==1)
 //        qDebug()<<"++add scope"<<mCurrentFile<<line<<mCurrentClassScope.count();
 #endif
 }
@@ -1468,7 +1468,7 @@ void CppParser::removeScopeLevel(int line)
     if (mCurrentScope.isEmpty())
         return; // TODO: should be an exception
 #ifdef QT_DEBUG
-    //if (mCurrentClassScope.count()==1)
+//    if (mCurrentClassScope.count()==1)
 //        qDebug()<<"--remove scope"<<mCurrentFile<<line<<mCurrentClassScope.count();
 #endif
     PStatement currentScope = getCurrentScope();
@@ -3618,7 +3618,7 @@ void CppParser::handleVar(const QString& typePrefix,bool isExtern,bool isStatic)
             break;
         } else if (isWordChar(mTokenizer[mIndex]->text[0])) {
             QString cmd=mTokenizer[mIndex]->text;
-            if (mTokenizer[mIndex+1]->text=='('
+            if (mIndex+1< mTokenizer.tokenCount() && mTokenizer[mIndex+1]->text=='('
                     && mTokenizer[mIndex+1]->matchIndex+1<mTokenizer.tokenCount()
                     && mTokenizer[mTokenizer[mIndex+1]->matchIndex+1]->text=='(') {
                         //function pointer
diff --git a/RedPandaIDE/parser/cpptokenizer.cpp b/RedPandaIDE/parser/cpptokenizer.cpp
index 5dbbf90c..755b3394 100644
--- a/RedPandaIDE/parser/cpptokenizer.cpp
+++ b/RedPandaIDE/parser/cpptokenizer.cpp
@@ -201,7 +201,6 @@ QString CppTokenizer::getForInit()
 QString CppTokenizer::getNextToken(TokenType *pTokenType, bool bSkipArray, bool bSkipBlock)
 {
     QString result;
-    int backupIndex;
     bool done = false;
     *pTokenType=TokenType::Normal;
     while (true) {
@@ -759,7 +758,28 @@ void CppTokenizer::skipTemplateArgs()
     if (*mCurrent != '<')
         return;
 
-    skipPair('<', '>');
+    if (skipAngleBracketPair())
+        return;
+    QChar* lastBracketPos = mCurrent;
+    bool shouldExit=false;
+    while (true) {
+        switch(mCurrent->unicode()) {
+        case '\0':
+        case ';':
+        case '}':
+        case '{':
+            shouldExit=true;
+            break;
+        case '>':
+            lastBracketPos = mCurrent;
+            break;
+        }
+        if (shouldExit)
+            break;
+        mCurrent++;
+    }
+    if (*lastBracketPos=='>')
+        mCurrent = lastBracketPos+1; //skip '>';
 }
 
 void CppTokenizer::skipToEOL()
diff --git a/RedPandaIDE/parser/cpptokenizer.h b/RedPandaIDE/parser/cpptokenizer.h
index de3d3f5c..4bcab3a4 100644
--- a/RedPandaIDE/parser/cpptokenizer.h
+++ b/RedPandaIDE/parser/cpptokenizer.h
@@ -82,6 +82,7 @@ private:
     void skipAssignment();
     void skipDoubleQuotes();
     void skipPair(const QChar& cStart, const QChar cEnd);
+    void skipParenthesis();
     bool skipAngleBracketPair();
     void skipRawString();
     void skipSingleQuote();