diff --git a/cores/common/arduino/libraries/common/MD5/MD5.h b/cores/common/arduino/libraries/common/MD5/MD5.h
index 2971867..75805d6 100644
--- a/cores/common/arduino/libraries/common/MD5/MD5.h
+++ b/cores/common/arduino/libraries/common/MD5/MD5.h
@@ -5,9 +5,6 @@
 #include <Arduino.h>
 
 // available built-in implementations
-#if LT_ARD_MD5_POLARSSL
-#include "MD5PolarSSLImpl.h"
-#endif
 #if LT_ARD_MD5_MBEDTLS
 #include "MD5MbedTLSImpl.h"
 #endif
diff --git a/cores/common/arduino/libraries/common/MD5/MD5PolarSSLImpl.cpp b/cores/common/arduino/libraries/common/MD5/MD5PolarSSLImpl.cpp
deleted file mode 100644
index 18f9d2c..0000000
--- a/cores/common/arduino/libraries/common/MD5/MD5PolarSSLImpl.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/* Copyright (c) Kuba Szczodrzyński 2022-06-03. */
-
-#if LT_ARD_MD5_POLARSSL
-
-extern "C" {
-
-#include <polarssl/md5.h>
-
-void MD5Init(md5_context *context) {
-	md5_init(context);
-	md5_starts(context);
-}
-
-void MD5Update(md5_context *context, const unsigned char *buf, unsigned len) {
-	md5_update(context, buf, len);
-}
-
-void MD5Final(unsigned char digest[16], md5_context *context) {
-	md5_finish(context, digest);
-}
-
-} // extern "C"
-
-#endif // LT_ARD_MD5_POLARSSL
diff --git a/cores/realtek-ambz/arduino/src/lt_defs.h b/cores/realtek-ambz/arduino/src/lt_defs.h
index 39692e0..a3ea2d6 100644
--- a/cores/realtek-ambz/arduino/src/lt_defs.h
+++ b/cores/realtek-ambz/arduino/src/lt_defs.h
@@ -2,5 +2,5 @@
 
 #error "Don't include this file directly"
 
-#define LT_ARD_HAS_SERIAL	1
-#define LT_ARD_MD5_POLARSSL 1
+#define LT_ARD_HAS_SERIAL  1
+#define LT_ARD_MD5_MBEDTLS 1
diff --git a/docs/dev/config.md b/docs/dev/config.md
index 1a976f3..bc668db 100644
--- a/docs/dev/config.md
+++ b/docs/dev/config.md
@@ -152,7 +152,6 @@ Checking for option value should be done with `#if` (not with `#ifdef`!) - if it
 	- `LT_ARD_HAS_WIFI` - WiFi library implemented
 	- `LT_ARD_HAS_WIRE` - Wire (I²C) library implemented
 	- `LT_ARD_HAS_SPI` - SPI library implemented
-	- `LT_ARD_MD5_POLARSSL` - use PolarSSL for MD5 library
 	- `LT_ARD_MD5_MBEDTLS` - use mbedTLS for MD5 library
 	- `LT_ARD_MD5_HOSTAPD` - use hostapd for MD5 library
 - misc options