diff --git a/tools/sdk/lib/liblwip2-1460-feat.a b/tools/sdk/lib/liblwip2-1460-feat.a
index a3cde8ecb..077150b28 100644
Binary files a/tools/sdk/lib/liblwip2-1460-feat.a and b/tools/sdk/lib/liblwip2-1460-feat.a differ
diff --git a/tools/sdk/lib/liblwip2-1460.a b/tools/sdk/lib/liblwip2-1460.a
index ecca46f77..a0f62e0d4 100644
Binary files a/tools/sdk/lib/liblwip2-1460.a and b/tools/sdk/lib/liblwip2-1460.a differ
diff --git a/tools/sdk/lib/liblwip2-536-feat.a b/tools/sdk/lib/liblwip2-536-feat.a
index 906c51f5b..fe232ac23 100644
Binary files a/tools/sdk/lib/liblwip2-536-feat.a and b/tools/sdk/lib/liblwip2-536-feat.a differ
diff --git a/tools/sdk/lib/liblwip2-536.a b/tools/sdk/lib/liblwip2-536.a
index f3f2c21aa..eef7e0242 100644
Binary files a/tools/sdk/lib/liblwip2-536.a and b/tools/sdk/lib/liblwip2-536.a differ
diff --git a/tools/sdk/lib/liblwip6-1460-feat.a b/tools/sdk/lib/liblwip6-1460-feat.a
index 5b03c292c..0ca9133d4 100644
Binary files a/tools/sdk/lib/liblwip6-1460-feat.a and b/tools/sdk/lib/liblwip6-1460-feat.a differ
diff --git a/tools/sdk/lib/liblwip6-536-feat.a b/tools/sdk/lib/liblwip6-536-feat.a
index f30d0bd99..b2373eb22 100644
Binary files a/tools/sdk/lib/liblwip6-536-feat.a and b/tools/sdk/lib/liblwip6-536-feat.a differ
diff --git a/tools/sdk/lwip2/builder b/tools/sdk/lwip2/builder
index 7d498d9d3..742125823 160000
--- a/tools/sdk/lwip2/builder
+++ b/tools/sdk/lwip2/builder
@@ -1 +1 @@
-Subproject commit 7d498d9d39998c9eafb575609a0803d78893c8c3
+Subproject commit 7421258237b7c8f61629226961af498a0a6e0096
diff --git a/tools/sdk/lwip2/include/lwip-git-hash.h b/tools/sdk/lwip2/include/lwip-git-hash.h
index d2f2682f6..146c0d311 100644
--- a/tools/sdk/lwip2/include/lwip-git-hash.h
+++ b/tools/sdk/lwip2/include/lwip-git-hash.h
@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.2-46-g7d498d9"
+#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.2-48-g7421258"
 #endif // LWIP_HASH_H
diff --git a/tools/sdk/lwip2/include/lwipopts.h b/tools/sdk/lwip2/include/lwipopts.h
index 91b41fdeb..d4dc17955 100644
--- a/tools/sdk/lwip2/include/lwipopts.h
+++ b/tools/sdk/lwip2/include/lwipopts.h
@@ -3676,6 +3676,16 @@ void tcp_kill_timewait (void);
 #define MEMP_NUM_TCP_PCB_TIME_WAIT       5
 #endif
 
+/*
+   --------------------------------------------------
+   ----------------- Alloc functions ----------------
+   --------------------------------------------------
+*/
+
+#define mem_clib_free(p)      vPortFree(p, NULL, -1)
+#define mem_clib_malloc(s)   pvPortMalloc(s, NULL, -1)
+#define mem_clib_calloc(n,s) pvPortZalloc(n*s, NULL, -1)
+
 #ifdef __cplusplus
 } // extern "C"
 #endif