diff --git a/include/json/reader.h b/include/json/reader.h
index c07ce19..9a8a4e3 100644
--- a/include/json/reader.h
+++ b/include/json/reader.h
@@ -333,9 +333,9 @@ public:
   Json::Value settings_;
 
   CharReaderBuilder();
-  virtual ~CharReaderBuilder();
+  ~CharReaderBuilder() override;
 
-  virtual CharReader* newCharReader() const;
+  CharReader* newCharReader() const override;
 
   /** \return true if 'settings' are legal and consistent;
    *   otherwise, indicate bad settings via 'invalid'.
diff --git a/include/json/value.h b/include/json/value.h
index 8e996ae..1ab22ef 100644
--- a/include/json/value.h
+++ b/include/json/value.h
@@ -40,8 +40,8 @@ namespace Json {
 class JSON_API Exception : public std::exception {
 public:
   Exception(std::string const& msg);
-  virtual ~Exception() throw();
-  virtual char const* what() const throw();
+  ~Exception() throw() override;
+  char const* what() const throw() override;
 protected:
   std::string const msg_;
 };
diff --git a/include/json/writer.h b/include/json/writer.h
index 39bfa9b..f94aa1f 100644
--- a/include/json/writer.h
+++ b/include/json/writer.h
@@ -112,12 +112,12 @@ public:
   Json::Value settings_;
 
   StreamWriterBuilder();
-  virtual ~StreamWriterBuilder();
+  ~StreamWriterBuilder() override;
 
   /**
    * \throw std::exception if something goes wrong (e.g. invalid settings)
    */
-  virtual StreamWriter* newStreamWriter() const;
+  StreamWriter* newStreamWriter() const override;
 
   /** \return true if 'settings' are legal and consistent;
    *   otherwise, indicate bad settings via 'invalid'.
@@ -158,7 +158,7 @@ class JSON_API FastWriter : public Writer {
 
 public:
   FastWriter();
-  virtual ~FastWriter() {}
+  ~FastWriter() override {}
 
   void enableYAMLCompatibility();
 
@@ -172,7 +172,7 @@ public:
   void omitEndingLineFeed();
 
 public: // overridden from Writer
-  virtual std::string write(const Value& root);
+  std::string write(const Value& root) override;
 
 private:
   void writeValue(const Value& value);
@@ -210,14 +210,14 @@ private:
 class JSON_API StyledWriter : public Writer {
 public:
   StyledWriter();
-  virtual ~StyledWriter() {}
+  ~StyledWriter() override {}
 
 public: // overridden from Writer
   /** \brief Serialize a Value in <a HREF="http://www.json.org">JSON</a> format.
    * \param root Value to serialize.
    * \return String containing the JSON document that represents the root value.
    */
-  virtual std::string write(const Value& root);
+  std::string write(const Value& root) override;
 
 private:
   void writeValue(const Value& value);
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 5b2f7b6..e0ba863 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -1903,9 +1903,9 @@ public:
   : collectComments_(collectComments)
   , reader_(features)
   {}
-  virtual bool parse(
+  bool parse(
       char const* beginDoc, char const* endDoc,
-      Value* root, std::string* errs) {
+      Value* root, std::string* errs) override {
     bool ok = reader_.parse(beginDoc, endDoc, *root, collectComments_);
     if (errs) {
       *errs = reader_.getFormattedErrorMessages();
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index a38a5f2..aaeda7a 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -816,7 +816,7 @@ struct BuiltStyledStreamWriter : public StreamWriter
       std::string const& nullSymbol,
       std::string const& endingLineFeedSymbol,
       bool useSpecialFloats);
-  virtual int write(Value const& root, std::ostream* sout);
+  int write(Value const& root, std::ostream* sout) override;
 private:
   void writeValue(Value const& value);
   void writeArrayValue(Value const& value);
diff --git a/src/test_lib_json/jsontest.h b/src/test_lib_json/jsontest.h
index d6b7cf3..01b9c40 100644
--- a/src/test_lib_json/jsontest.h
+++ b/src/test_lib_json/jsontest.h
@@ -265,8 +265,8 @@ TestResult& checkStringEqual(TestResult& result,
     }                                                                          \
                                                                                \
   public: /* overidden from TestCase */                                        \
-    virtual const char* testName() const { return #FixtureType "/" #name; }    \
-    virtual void runTestCase();                                                \
+    const char* testName() const override { return #FixtureType "/" #name; }    \
+    void runTestCase() override;                                                \
   };                                                                           \
                                                                                \
   void Test##FixtureType##name::runTestCase()