diff --git a/include/spdlog/sinks/ansicolor_sink.h b/include/spdlog/sinks/ansicolor_sink.h
index c35b33ca..2a76ae4e 100644
--- a/include/spdlog/sinks/ansicolor_sink.h
+++ b/include/spdlog/sinks/ansicolor_sink.h
@@ -82,13 +82,13 @@ private:
 };
 
 template <typename Mutex>
-class ansicolor_stdout_sink : public ansicolor_sink<Mutex> {
+class ansicolor_stdout_sink final : public ansicolor_sink<Mutex> {
 public:
     explicit ansicolor_stdout_sink(color_mode mode = color_mode::automatic);
 };
 
 template <typename Mutex>
-class ansicolor_stderr_sink : public ansicolor_sink<Mutex> {
+class ansicolor_stderr_sink final : public ansicolor_sink<Mutex> {
 public:
     explicit ansicolor_stderr_sink(color_mode mode = color_mode::automatic);
 };
diff --git a/include/spdlog/sinks/msvc_sink.h b/include/spdlog/sinks/msvc_sink.h
index b1502400..7baf1dac 100644
--- a/include/spdlog/sinks/msvc_sink.h
+++ b/include/spdlog/sinks/msvc_sink.h
@@ -19,7 +19,7 @@ namespace sinks {
  * MSVC sink (logging using OutputDebugStringA)
  */
 template <typename Mutex>
-class msvc_sink : public base_sink<Mutex> {
+class msvc_sink final : public base_sink<Mutex> {
 public:
     msvc_sink() = default;
     msvc_sink(bool check_debugger_present)
diff --git a/include/spdlog/sinks/null_sink.h b/include/spdlog/sinks/null_sink.h
index 64e29d41..2d028b0b 100644
--- a/include/spdlog/sinks/null_sink.h
+++ b/include/spdlog/sinks/null_sink.h
@@ -13,7 +13,7 @@ namespace spdlog {
 namespace sinks {
 
 template <typename Mutex>
-class null_sink : public base_sink<Mutex> {
+class null_sink final : public base_sink<Mutex> {
 protected:
     void sink_it_(const details::log_msg &) override {}
     void flush_() override {}
diff --git a/include/spdlog/sinks/stdout_sinks.h b/include/spdlog/sinks/stdout_sinks.h
index 0d6325f5..aeb0b0ab 100644
--- a/include/spdlog/sinks/stdout_sinks.h
+++ b/include/spdlog/sinks/stdout_sinks.h
@@ -40,13 +40,13 @@ private:
 };
 
 template <typename Mutex>
-class stdout_sink : public stdout_sink_base<Mutex> {
+class stdout_sink final : public stdout_sink_base<Mutex> {
 public:
     stdout_sink();
 };
 
 template <typename Mutex>
-class stderr_sink : public stdout_sink_base<Mutex> {
+class stderr_sink final : public stdout_sink_base<Mutex> {
 public:
     stderr_sink();
 };
diff --git a/include/spdlog/sinks/syslog_sink.h b/include/spdlog/sinks/syslog_sink.h
index ec9130ee..ede10eb3 100644
--- a/include/spdlog/sinks/syslog_sink.h
+++ b/include/spdlog/sinks/syslog_sink.h
@@ -18,7 +18,7 @@ namespace sinks {
  * Sink that write to syslog using the `syscall()` library call.
  */
 template <typename Mutex>
-class syslog_sink : public base_sink<Mutex> {
+class syslog_sink final : public base_sink<Mutex> {
 public:
     syslog_sink(std::string ident, int syslog_option, int syslog_facility, bool enable_formatting)
         : enable_formatting_{enable_formatting},
diff --git a/include/spdlog/sinks/tcp_sink.h b/include/spdlog/sinks/tcp_sink.h
index 6f36737d..b2fb251a 100644
--- a/include/spdlog/sinks/tcp_sink.h
+++ b/include/spdlog/sinks/tcp_sink.h
@@ -39,7 +39,7 @@ struct tcp_sink_config {
 };
 
 template <typename Mutex>
-class tcp_sink : public spdlog::sinks::base_sink<Mutex> {
+class tcp_sink final : public spdlog::sinks::base_sink<Mutex> {
 public:
     // connect to tcp host/port or throw if failed
     // host can be hostname or ip address
diff --git a/include/spdlog/sinks/udp_sink.h b/include/spdlog/sinks/udp_sink.h
index 8701b82f..282f682f 100644
--- a/include/spdlog/sinks/udp_sink.h
+++ b/include/spdlog/sinks/udp_sink.h
@@ -33,7 +33,7 @@ struct udp_sink_config {
 };
 
 template <typename Mutex>
-class udp_sink : public spdlog::sinks::base_sink<Mutex> {
+class udp_sink final : public spdlog::sinks::base_sink<Mutex> {
 public:
     // host can be hostname or ip address
     explicit udp_sink(udp_sink_config sink_config)
diff --git a/src/pattern_formatter.cpp b/src/pattern_formatter.cpp
index 198791fb..89341dee 100644
--- a/src/pattern_formatter.cpp
+++ b/src/pattern_formatter.cpp
@@ -147,7 +147,7 @@ public:
 static std::array<const char *, 7> full_days{{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}};
 
 template <typename ScopedPadder>
-class A_formatter : public flag_formatter {
+class A_formatter final : public flag_formatter {
 public:
     explicit A_formatter(padding_info padinfo)
         : flag_formatter(padinfo) {}
@@ -741,7 +741,7 @@ private:
 // Class for formatting Mapped Diagnostic Context (MDC) in log messages.
 // Example: [logger-name] [info] [mdc_key_1:mdc_value_1 mdc_key_2:mdc_value_2] some message
 template <typename ScopedPadder>
-class mdc_formatter : public flag_formatter {
+class mdc_formatter final : public flag_formatter {
 public:
     explicit mdc_formatter(padding_info padinfo)
             : flag_formatter(padinfo) {}