diff --git a/mingw-w64-mpfr/PKGBUILD b/mingw-w64-mpfr/PKGBUILD
index b67d041077..d86a143f2f 100644
--- a/mingw-w64-mpfr/PKGBUILD
+++ b/mingw-w64-mpfr/PKGBUILD
@@ -5,7 +5,7 @@ _realname=mpfr
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 _pkgver=4.2.0
-pkgver=${_pkgver}.p9
+pkgver=${_pkgver}.p12
 pkgrel=1
 pkgdesc="Multiple-precision floating-point library (mingw-w64)"
 arch=('any')
@@ -19,7 +19,7 @@ source=(https://ftp.gnu.org/gnu/mpfr/${_realname}-${_pkgver}.tar.xz{,.sig}
         patches.diff) # wget https://www.mpfr.org/mpfr-4.2.0/allpatches -O patches.diff
 sha256sums=('06a378df13501248c1b2db5aa977a2c8126ae849a9d9b7be2546fb4a9c26d993'
             'SKIP'
-            '06da0b2a56e365f7e74ac241926f61d2574a0754548ff8116e9ddee0dabacda0')
+            'a9099cee74188d5f522b7b3fca0097196c6dd38126f8f042d233010cbf92e8d0')
 validpgpkeys=('A534BE3F83E241D918280AEB5831D11A0D4DB02A')
 
 prepare() {
diff --git a/mingw-w64-mpfr/patches.diff b/mingw-w64-mpfr/patches.diff
index 07fcf2592c..75304956be 100644
--- a/mingw-w64-mpfr/patches.diff
+++ b/mingw-w64-mpfr/patches.diff
@@ -2044,3 +2044,151 @@ diff -Naurd mpfr-4.2.0-a/tests/tsprintf.c mpfr-4.2.0-b/tests/tsprintf.c
    test_locale ();
  
    if (getenv ("MPFR_CHECK_LIBC_PRINTF"))
+diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
+--- mpfr-4.2.0-a/PATCHES	2023-07-17 13:54:11.126789510 +0000
++++ mpfr-4.2.0-b/PATCHES	2023-07-17 13:54:11.170788387 +0000
+@@ -0,0 +1 @@
++gcc-pr106155-workaround
+diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
+--- mpfr-4.2.0-a/VERSION	2023-05-17 17:19:35.596201603 +0000
++++ mpfr-4.2.0-b/VERSION	2023-07-17 13:54:11.170788387 +0000
+@@ -1 +1 @@
+-4.2.0-p9
++4.2.0-p10
+diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
+--- mpfr-4.2.0-a/src/mpfr.h	2023-05-17 17:19:35.592201606 +0000
++++ mpfr-4.2.0-b/src/mpfr.h	2023-07-17 13:54:11.170788387 +0000
+@@ -27,7 +27,7 @@
+ #define MPFR_VERSION_MAJOR 4
+ #define MPFR_VERSION_MINOR 2
+ #define MPFR_VERSION_PATCHLEVEL 0
+-#define MPFR_VERSION_STRING "4.2.0-p9"
++#define MPFR_VERSION_STRING "4.2.0-p10"
+ 
+ /* User macros:
+    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
+diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
+--- mpfr-4.2.0-a/src/version.c	2023-05-17 17:19:35.592201606 +0000
++++ mpfr-4.2.0-b/src/version.c	2023-07-17 13:54:11.170788387 +0000
+@@ -25,5 +25,5 @@
+ const char *
+ mpfr_get_version (void)
+ {
+-  return "4.2.0-p9";
++  return "4.2.0-p10";
+ }
+diff -Naurd mpfr-4.2.0-a/tests/tfpif.c mpfr-4.2.0-b/tests/tfpif.c
+--- mpfr-4.2.0-a/tests/tfpif.c	2023-01-05 17:09:48.000000000 +0000
++++ mpfr-4.2.0-b/tests/tfpif.c	2023-07-17 13:54:11.162788591 +0000
+@@ -277,7 +277,10 @@
+ 
+   for (i = 0; i < BAD; i++)
+     {
+-      mpfr_exp_t emax;
++      mpfr_exp_t INITIALIZED(emax);
++      /* The INITIALIZED() is a workaround for GCC bug 106155:
++         https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106155 */
++
+       /* For i == 6, mpfr_prec_t needs at least a 65-bit precision
+          (64 value bits + 1 sign bit) to avoid a failure. */
+       if (i == 6 && MPFR_PREC_BITS > 64)
+diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
+--- mpfr-4.2.0-a/PATCHES	2023-07-17 13:56:17.375566485 +0000
++++ mpfr-4.2.0-b/PATCHES	2023-07-17 13:56:17.415565464 +0000
+@@ -0,0 +1 @@
++inp_str-nullchar
+diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
+--- mpfr-4.2.0-a/VERSION	2023-07-17 13:54:11.170788387 +0000
++++ mpfr-4.2.0-b/VERSION	2023-07-17 13:56:17.415565464 +0000
+@@ -1 +1 @@
+-4.2.0-p10
++4.2.0-p11
+diff -Naurd mpfr-4.2.0-a/src/inp_str.c mpfr-4.2.0-b/src/inp_str.c
+--- mpfr-4.2.0-a/src/inp_str.c	2023-01-05 17:09:48.000000000 +0000
++++ mpfr-4.2.0-b/src/inp_str.c	2023-07-17 13:56:17.407565669 +0000
+@@ -69,6 +69,15 @@
+       if (c == EOF || isspace (c))
+         break;
+       str[str_size++] = (unsigned char) c;
++      /* If c is '\0' (while not being a whitespace character), the word will
++         not have a valid format. But in the context of a string in memory,
++         '\0' is a terminating null character. So, to avoid ending with a
++         valid string format (like "1" with ignored characters after the
++         terminating null character), we need to make sure that the string
++         does not have a valid format; so let's start it with '*'. Note
++         that we should read the full word, so we cannot break. */
++      if (MPFR_UNLIKELY (c == '\0'))
++        str[0] = '*';
+       if (str_size == (size_t) -1)
+         break;
+       c = getc (stream);
+diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
+--- mpfr-4.2.0-a/src/mpfr.h	2023-07-17 13:54:11.170788387 +0000
++++ mpfr-4.2.0-b/src/mpfr.h	2023-07-17 13:56:17.411565566 +0000
+@@ -27,7 +27,7 @@
+ #define MPFR_VERSION_MAJOR 4
+ #define MPFR_VERSION_MINOR 2
+ #define MPFR_VERSION_PATCHLEVEL 0
+-#define MPFR_VERSION_STRING "4.2.0-p10"
++#define MPFR_VERSION_STRING "4.2.0-p11"
+ 
+ /* User macros:
+    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
+diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
+--- mpfr-4.2.0-a/src/version.c	2023-07-17 13:54:11.170788387 +0000
++++ mpfr-4.2.0-b/src/version.c	2023-07-17 13:56:17.415565464 +0000
+@@ -25,5 +25,5 @@
+ const char *
+ mpfr_get_version (void)
+ {
+-  return "4.2.0-p10";
++  return "4.2.0-p11";
+ }
+diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
+--- mpfr-4.2.0-a/PATCHES	2023-07-17 13:57:28.913739912 +0000
++++ mpfr-4.2.0-b/PATCHES	2023-07-17 13:57:28.961738687 +0000
+@@ -0,0 +1 @@
++strtofr-nullchar
+diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
+--- mpfr-4.2.0-a/VERSION	2023-07-17 13:56:17.415565464 +0000
++++ mpfr-4.2.0-b/VERSION	2023-07-17 13:57:28.961738687 +0000
+@@ -1 +1 @@
+-4.2.0-p11
++4.2.0-p12
+diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
+--- mpfr-4.2.0-a/src/mpfr.h	2023-07-17 13:56:17.411565566 +0000
++++ mpfr-4.2.0-b/src/mpfr.h	2023-07-17 13:57:28.957738789 +0000
+@@ -27,7 +27,7 @@
+ #define MPFR_VERSION_MAJOR 4
+ #define MPFR_VERSION_MINOR 2
+ #define MPFR_VERSION_PATCHLEVEL 0
+-#define MPFR_VERSION_STRING "4.2.0-p11"
++#define MPFR_VERSION_STRING "4.2.0-p12"
+ 
+ /* User macros:
+    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
+diff -Naurd mpfr-4.2.0-a/src/strtofr.c mpfr-4.2.0-b/src/strtofr.c
+--- mpfr-4.2.0-a/src/strtofr.c	2023-01-05 17:09:48.000000000 +0000
++++ mpfr-4.2.0-b/src/strtofr.c	2023-07-17 13:57:28.949738993 +0000
+@@ -242,7 +242,10 @@
+   pstr->mantissa = NULL;
+ 
+   /* Optional leading whitespace */
+-  while (isspace((unsigned char) *str)) str++;
++  /* For non-"C" locales, the ISO C standard allows isspace(0) to
++     return true. So we need to stop explicitly on '\0'. */
++  while (*str != '\0' && isspace ((unsigned char) *str))
++    str++;
+ 
+   /* An optional sign `+' or `-' */
+   pstr->negative = (*str == '-');
+diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
+--- mpfr-4.2.0-a/src/version.c	2023-07-17 13:56:17.415565464 +0000
++++ mpfr-4.2.0-b/src/version.c	2023-07-17 13:57:28.961738687 +0000
+@@ -25,5 +25,5 @@
+ const char *
+ mpfr_get_version (void)
+ {
+-  return "4.2.0-p11";
++  return "4.2.0-p12";
+ }