diff --git a/dkarm-eabi/patches/newlib-3.0.0.patch b/dkarm-eabi/patches/newlib-3.1.0.patch
similarity index 99%
rename from dkarm-eabi/patches/newlib-3.0.0.patch
rename to dkarm-eabi/patches/newlib-3.1.0.patch
index 8c2315c..b6454d1 100644
--- a/dkarm-eabi/patches/newlib-3.0.0.patch
+++ b/dkarm-eabi/patches/newlib-3.1.0.patch
@@ -1,8 +1,8 @@
 diff --git a/libgloss/configure b/libgloss/configure
-index aa6f8f834..0e8579890 100755
+index 1a4033dce..ba7aea7b0 100755
 --- a/libgloss/configure
 +++ b/libgloss/configure
-@@ -2594,6 +2594,8 @@ if test "${config_libnosys}" = "true"; then
+@@ -2599,6 +2599,8 @@ if test "${config_libnosys}" = "true"; then
  
  fi
  
@@ -12,7 +12,7 @@ index aa6f8f834..0e8579890 100755
  
  ac_config_commands="$ac_config_commands depfiles"
 diff --git a/libgloss/configure.in b/libgloss/configure.in
-index 6da164352..f18f17447 100644
+index 41843eed1..dc0e2a5fd 100644
 --- a/libgloss/configure.in
 +++ b/libgloss/configure.in
 @@ -2,6 +2,7 @@ dnl Process this file with autoconf to produce a configure script.
@@ -23,7 +23,7 @@ index 6da164352..f18f17447 100644
  
  if test "${enable_shared}" = "yes" ; then
      echo "Shared libraries not supported for cross compiling, ignored"
-@@ -187,6 +188,7 @@ dnl fi
+@@ -190,6 +191,7 @@ dnl fi
  if test "${config_libnosys}" = "true"; then
    AC_CONFIG_SUBDIRS([libnosys])
  fi
@@ -7404,10 +7404,10 @@ index 000000000..61de918bc
 +	return ret;
 +}
 diff --git a/newlib/configure.host b/newlib/configure.host
-index eb645868b..9cb69fde9 100644
+index 6c49cb750..6a5e1c78d 100644
 --- a/newlib/configure.host
 +++ b/newlib/configure.host
-@@ -631,6 +631,14 @@ newlib_cflags="${newlib_cflags} -DCLOCK_PROVIDED -DMALLOC_PROVIDED -DEXIT_PROVID
+@@ -666,6 +666,14 @@ newlib_cflags="${newlib_cflags} -DCLOCK_PROVIDED -DMALLOC_PROVIDED -DEXIT_PROVID
  	syscall_dir=syscalls
  	default_newlib_io_long_long="yes"
  	;;
@@ -7423,7 +7423,7 @@ index eb645868b..9cb69fde9 100644
  	syscall_dir=syscalls
  	;;
 diff --git a/newlib/libc/include/stdio.h b/newlib/libc/include/stdio.h
-index cbc0fa989..10960f912 100644
+index 164d95bca..083e48758 100644
 --- a/newlib/libc/include/stdio.h
 +++ b/newlib/libc/include/stdio.h
 @@ -233,7 +233,7 @@ int	fsetpos (FILE *, const _fpos_t *);
@@ -7436,7 +7436,7 @@ index cbc0fa989..10960f912 100644
  void	clearerr (FILE *);
  int	feof (FILE *);
 diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
-index 2082dfdb1..e535f189b 100644
+index 49b62ebf6..d84ffaa59 100644
 --- a/newlib/libc/include/sys/config.h
 +++ b/newlib/libc/include/sys/config.h
 @@ -4,6 +4,9 @@
@@ -7516,7 +7516,7 @@ index a3fb5c02c..5debd1525 100644
 +
 +#endif // _dirent_h_
 diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
-index 2900b332f..6efb54eb3 100644
+index f28dd071b..96980676d 100644
 --- a/newlib/libc/include/sys/features.h
 +++ b/newlib/libc/include/sys/features.h
 @@ -330,6 +330,9 @@ extern "C" {
@@ -7531,7 +7531,7 @@ index 2900b332f..6efb54eb3 100644
  #ifdef __rtems__
 diff --git a/newlib/libc/include/sys/iosupport.h b/newlib/libc/include/sys/iosupport.h
 new file mode 100644
-index 000000000..dfed4107e
+index 000000000..c190fa37d
 --- /dev/null
 +++ b/newlib/libc/include/sys/iosupport.h
 @@ -0,0 +1,112 @@
@@ -7547,7 +7547,7 @@ index 000000000..dfed4107e
 +#include <reent.h>
 +#include <sys/stat.h>
 +#include <sys/statvfs.h>
-+#include <time.h>
++#include <sys/time.h>
 +
 +enum	{
 +	STD_IN,
@@ -7648,7 +7648,7 @@ index 000000000..dfed4107e
 +#endif // __iosupp_h__
 +//---------------------------------------------------------------------------------
 diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
-index 1ef226194..ce3721a14 100644
+index 6e55e1c1f..6e0c1c9cf 100644
 --- a/newlib/libc/include/sys/reent.h
 +++ b/newlib/libc/include/sys/reent.h
 @@ -416,6 +416,8 @@ struct _reent
@@ -7659,8 +7659,8 @@ index 1ef226194..ce3721a14 100644
 +  void *deviceData;
  };
  
- extern const struct __sFILE_fake __sf_fake_stdin;
-@@ -647,6 +649,7 @@ struct _reent
+ #ifdef _REENT_GLOBAL_STDIO_STREAMS
+@@ -686,6 +688,7 @@ struct _reent
  # ifndef _REENT_GLOBAL_STDIO_STREAMS
    __FILE __sf[3];  		/* first three file descriptors */
  # endif
@@ -7752,10 +7752,10 @@ index 5e937f103..635a7a6b8 100644
  };
  #endif
 diff --git a/newlib/libc/locale/locale.c b/newlib/libc/locale/locale.c
-index baa5451a6..a11f89473 100644
+index 4c343e462..c04493460 100644
 --- a/newlib/libc/locale/locale.c
 +++ b/newlib/libc/locale/locale.c
-@@ -91,7 +91,7 @@ beginning with <<"LC_">>.
+@@ -92,7 +92,7 @@ beginning with <<"LC_">>.
  
  <<localeconv>> returns a pointer to a structure (also defined in
  `<<locale.h>>') describing the locale-specific conventions currently
@@ -7764,7 +7764,7 @@ index baa5451a6..a11f89473 100644
  
  <<_localeconv_r>> and <<_setlocale_r>> are reentrant versions of
  <<localeconv>> and <<setlocale>> respectively.  The extra argument
-@@ -165,15 +165,18 @@ No supporting OS subroutines are required.
+@@ -166,15 +166,18 @@ No supporting OS subroutines are required.
  #include "../ctype/ctype_.h"
  #include "../stdlib/local.h"
  
@@ -7783,7 +7783,7 @@ index baa5451a6..a11f89473 100644
  #ifdef _MB_CAPABLE
  /*
   * Category names for getenv()
-@@ -193,7 +196,11 @@ static char *categories[_LC_LAST] = {
+@@ -194,7 +197,11 @@ static char *categories[_LC_LAST] = {
   * Default locale per POSIX.  Can be overridden on a per-target base.
   */
  #ifndef DEFAULT_LOCALE
@@ -7796,7 +7796,7 @@ index baa5451a6..a11f89473 100644
  #endif
  
  #ifdef _MB_CAPABLE
-@@ -206,8 +213,13 @@ char __default_locale[ENCODING_LEN + 1] = DEFAULT_LOCALE;
+@@ -207,8 +214,13 @@ char __default_locale[ENCODING_LEN + 1] = DEFAULT_LOCALE;
  const struct __locale_t __C_locale =
  {
    { "C", "C", "C", "C", "C", "C", "C", },
@@ -7810,7 +7810,7 @@ index baa5451a6..a11f89473 100644
    0,
    DEFAULT_CTYPE_PTR,
    {
-@@ -218,9 +230,15 @@ const struct __locale_t __C_locale =
+@@ -219,9 +231,15 @@ const struct __locale_t __C_locale =
      CHAR_MAX, CHAR_MAX
    },
  #ifndef __HAVE_LOCALE_INFO__
@@ -7826,7 +7826,7 @@ index baa5451a6..a11f89473 100644
  #else /* __HAVE_LOCALE_INFO__ */
    {
      { NULL, NULL },			/* LC_ALL */
-@@ -239,10 +257,11 @@ const struct __locale_t __C_locale =
+@@ -240,10 +258,11 @@ const struct __locale_t __C_locale =
  };
  #endif /* _MB_CAPABLE */
  
@@ -7839,7 +7839,7 @@ index baa5451a6..a11f89473 100644
    __utf8_wctomb,
    __utf8_mbtowc,
  #else
-@@ -259,9 +278,15 @@ struct __locale_t __global_locale =
+@@ -260,9 +279,15 @@ struct __locale_t __global_locale =
      CHAR_MAX, CHAR_MAX
    },
  #ifndef __HAVE_LOCALE_INFO__
@@ -7855,7 +7855,7 @@ index baa5451a6..a11f89473 100644
  #else /* __HAVE_LOCALE_INFO__ */
    {
      { NULL, NULL },			/* LC_ALL */
-@@ -295,7 +320,7 @@ _setlocale_r (struct _reent *p,
+@@ -296,7 +321,7 @@ _setlocale_r (struct _reent *p,
  {
  #ifndef _MB_CAPABLE
    if (locale)
@@ -7864,7 +7864,7 @@ index baa5451a6..a11f89473 100644
        if (strcmp (locale, "POSIX") && strcmp (locale, "C")
  	  && strcmp (locale, ""))
          return NULL;
-@@ -982,6 +1007,7 @@ __locale_ctype_ptr_l (struct __locale_t *locale)
+@@ -990,6 +1015,7 @@ __locale_ctype_ptr_l (struct __locale_t *locale)
  
  const char *
  __locale_ctype_ptr (void)
@@ -7932,17 +7932,15 @@ index d9dbcd5c3..43712f813 100644
  
 diff --git a/newlib/libc/machine/arm/sync_synchronize.c b/newlib/libc/machine/arm/sync_synchronize.c
 new file mode 100644
-index 000000000..3acc9e094
+index 000000000..f5a85c3a8
 --- /dev/null
 +++ b/newlib/libc/machine/arm/sync_synchronize.c
-@@ -0,0 +1,10 @@
+@@ -0,0 +1,8 @@
 +#if __ARM_ARCH < 6
 +#include <sys/cdefs.h>
 +void __attribute__((weak))
 +__sync_synchronize (void)
 +{
-+  __warn_references (__sync_synchronize,
-+		     "legacy compatible __sync_synchronize used. Not suitable for multi-threaded applications");
 +  return;
 +}
 +#endif
@@ -8093,7 +8091,7 @@ index c4bf2dbe3..d756df37d 100644
  			if (ch == 'S' || (flags & LONGINT)) {
  				mbstate_t ps;
 diff --git a/newlib/libc/stdio/vfscanf.c b/newlib/libc/stdio/vfscanf.c
-index b97235559..298f68a9c 100644
+index 9c38eebf4..fbc8d877d 100644
 --- a/newlib/libc/stdio/vfscanf.c
 +++ b/newlib/libc/stdio/vfscanf.c
 @@ -74,6 +74,8 @@ These are GNU extensions.
@@ -8120,7 +8118,7 @@ index 980b31e3b..722be905e 100644
  
  #ifdef INTEGER_ONLY
 diff --git a/newlib/libc/stdio/vfwscanf.c b/newlib/libc/stdio/vfwscanf.c
-index c3470a15c..626f13723 100644
+index 0464b0837..435fc0142 100644
 --- a/newlib/libc/stdio/vfwscanf.c
 +++ b/newlib/libc/stdio/vfwscanf.c
 @@ -74,6 +74,9 @@ PORTABILITY
diff --git a/select_toolchain.sh b/select_toolchain.sh
index 847982b..e90374a 100755
--- a/select_toolchain.sh
+++ b/select_toolchain.sh
@@ -32,7 +32,7 @@ case "$VERSION" in
   "1" )
     GCC_VER=8.2.0
     BINUTILS_VER=2.32
-    NEWLIB_VER=3.0.0
+    NEWLIB_VER=3.1.0
     GDB_VER=8.2.1
     basedir='dkarm-eabi'
     package=devkitARM