diff --git a/lib/src/HttpMessageBody.h b/lib/src/HttpMessageBody.h
index 249e3139..023bcdef 100644
--- a/lib/src/HttpMessageBody.h
+++ b/lib/src/HttpMessageBody.h
@@ -48,6 +48,9 @@ class HttpMessageBody
     virtual void append(const char *buf, size_t len)
     {
     }
+    virtual ~HttpMessageBody()
+    {
+    }
 
   protected:
     BodyType type_{BodyType::kNone};
diff --git a/lib/src/SharedLibManager.cc b/lib/src/SharedLibManager.cc
index fd8b642b..78b5ca06 100644
--- a/lib/src/SharedLibManager.cc
+++ b/lib/src/SharedLibManager.cc
@@ -217,7 +217,6 @@ void *SharedLibManager::compileAndLoadLib(const std::string &sourceFile,
     auto soFile = sourceFile.substr(0, pos);
     soFile.append(".so");
     cmd.append(soFile);
-    void *Handle = nullptr;
     LOG_TRACE << cmd;
 
     if (system(cmd.c_str()) == 0)
diff --git a/lib/src/StaticFileRouter.cc b/lib/src/StaticFileRouter.cc
index cee3cad9..06c8d287 100644
--- a/lib/src/StaticFileRouter.cc
+++ b/lib/src/StaticFileRouter.cc
@@ -72,7 +72,6 @@ void StaticFileRouter::route(
     for (auto &location : **ioLocationsPtr_)
     {
         auto &URI = location.uriPrefix_;
-        auto &defaultContentType = location.defaultContentType_;
         if (location.realLocation_.empty())
         {
             if (!location.alias_.empty())
diff --git a/lib/src/Utilities.cc b/lib/src/Utilities.cc
index e523c201..c8e5f063 100644
--- a/lib/src/Utilities.cc
+++ b/lib/src/Utilities.cc
@@ -63,25 +63,27 @@ class Base64CharMap
     Base64CharMap()
     {
         char index = 0;
-        for (char c = 'A'; c <= 'Z'; ++c)
+        for (int c = 'A'; c <= 'Z'; ++c)
         {
             charMap_[c] = index++;
         }
-        for (char c = 'a'; c <= 'z'; ++c)
+        for (int c = 'a'; c <= 'z'; ++c)
         {
             charMap_[c] = index++;
         }
-        for (char c = '0'; c <= '9'; ++c)
+        for (int c = '0'; c <= '9'; ++c)
         {
             charMap_[c] = index++;
         }
-        charMap_['+'] = charMap_['-'] = index++;
-        charMap_['/'] = charMap_['_'] = index;
+        charMap_[static_cast<int>('+')] = charMap_[static_cast<int>('-')] =
+            index++;
+        charMap_[static_cast<int>('/')] = charMap_[static_cast<int>('_')] =
+            index;
         charMap_[0] = 0xff;
     }
     char getIndex(const char c) const noexcept
     {
-        return charMap_[c];
+        return charMap_[static_cast<int>(c)];
     }
 
   private:
@@ -120,7 +122,7 @@ std::string genRandomString(int length)
         "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
     static std::once_flag once;
     static const size_t len = strlen(char_space);
-    static const size_t randMax = RAND_MAX - (RAND_MAX % len);
+    static const int randMax = RAND_MAX - (RAND_MAX % len);
     std::call_once(once, []() {
         std::srand(static_cast<unsigned int>(time(nullptr)));
     });
diff --git a/orm_lib/inc/drogon/orm/SqlBinder.h b/orm_lib/inc/drogon/orm/SqlBinder.h
index 1c97726e..67e7c8b0 100644
--- a/orm_lib/inc/drogon/orm/SqlBinder.h
+++ b/orm_lib/inc/drogon/orm/SqlBinder.h
@@ -254,18 +254,18 @@ class SqlBinder
 
     SqlBinder(const std::string &sql, DbClient &client, ClientType type)
         : sqlPtr_(std::make_shared<std::string>(sql)),
-          client_(client),
-          type_(type),
           sqlViewPtr_(sqlPtr_->data()),
-          sqlViewLength_(sqlPtr_->length())
+          sqlViewLength_(sqlPtr_->length()),
+          client_(client),
+          type_(type)
     {
     }
     SqlBinder(std::string &&sql, DbClient &client, ClientType type)
         : sqlPtr_(std::make_shared<std::string>(std::move(sql))),
-          client_(client),
-          type_(type),
           sqlViewPtr_(sqlPtr_->data()),
-          sqlViewLength_(sqlPtr_->length())
+          sqlViewLength_(sqlPtr_->length()),
+          client_(client),
+          type_(type)
     {
     }
     SqlBinder(const char *sql,
diff --git a/trantor b/trantor
index bb48ddfc..5ab4a4c8 160000
--- a/trantor
+++ b/trantor
@@ -1 +1 @@
-Subproject commit bb48ddfcf106874f5b4db9abbd13b9392eba9a23
+Subproject commit 5ab4a4c85eb119fae96541d7f6723ba4ecef4791