diff --git a/SHA256SUMS.sources b/SHA256SUMS.sources
index 022c331..b26a70a 100644
--- a/SHA256SUMS.sources
+++ b/SHA256SUMS.sources
@@ -7,6 +7,7 @@ e20bdd49a0fb317959b410c1fe81269a620ec21207045d8a37cadea621be4b59  binutils-2.14.
 7007fc89c216fbfaff5525359b02a7e5b612694df5168c74673f67055f015095  bison-3.4.1.tar.gz
 ab5a03176ee106d3f0fa90e381da478ddae405918153cca248e682cd0c4a2269  bzip2-1.0.8.tar.gz
 c25b36b8af6e0ad2a875daf4d6196bd0df28a62be7dd252e5f99a4d5d7288d95  coreutils-5.0.tar.bz2
+8815a918867a14dcfeb623786b3a7f7483a039a78dd5a94e9b562667684c07a1  coreutils-6.3.tar.bz2
 d5f2489c4056a31528e3ada4adacc23d498532b0af1a980f2f76158162b139d6  diffutils-2.7.tar.gz
 bc79b890f35ca38d66ff89a6e3758226131e51ccbd10ef78d5ff150b7bd73689  flex-2.5.11.tar.gz
 e87aae032bf07c26f85ac0ed3250998c37621d95f8bd748b31f15b33c45ee995  flex-2.6.4.tar.gz
diff --git a/parts.rst b/parts.rst
index c9d593a..0f492f5 100644
--- a/parts.rst
+++ b/parts.rst
@@ -306,6 +306,11 @@ coreutils 5.0
 including ``comm``, ``expr``, ``date``, ``dd``, ``sort``, ``uname`` and
 ``uniq``. This fixes a variety of issues with existing ``coreutils``.
 
+coreutils 6.3
+=============
+We build ``sha256sum`` from coreutils 6.3 since it is absent in 5.0.
+Other utils are not build at this stage.
+
 gawk 3.0.4
 ==========
 
diff --git a/rootfs.sh b/rootfs.sh
index 5e0c0ff..7a8200b 100755
--- a/rootfs.sh
+++ b/rootfs.sh
@@ -156,6 +156,9 @@ get_file ftp://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz 1
 # coreutils 5.0
 get_file https://ftp.gnu.org/gnu/coreutils/coreutils-5.0.tar.bz2 1
 
+# coreutils 6.3
+get_file https://ftp.gnu.org/gnu/coreutils/coreutils-6.3.tar.bz2
+
 # heirloom-devtools
 get_file http://downloads.sourceforge.net/project/heirloom/heirloom-devtools/070527/heirloom-devtools-070527.tar.bz2
 
diff --git a/sysa/coreutils-6.3/checksums b/sysa/coreutils-6.3/checksums
new file mode 100644
index 0000000..e2b85e4
--- /dev/null
+++ b/sysa/coreutils-6.3/checksums
@@ -0,0 +1 @@
+34ec35d9de41dd954802dbcfc7c07697f1e7e3cecedbe32ea16a6da85c3eb260  /after/bin/sha256sum
diff --git a/sysa/coreutils-6.3/coreutils-6.3.sh b/sysa/coreutils-6.3/coreutils-6.3.sh
new file mode 100755
index 0000000..3d7f3e0
--- /dev/null
+++ b/sysa/coreutils-6.3/coreutils-6.3.sh
@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default_src_prepare
+
+    cp lib/fnmatch_.h lib/fnmatch.h
+    cp lib/fcntl_.h lib/fcntl.h
+    sed -i 's#@ABSOLUTE_FCNTL_H@#"/after/include/musl/fcntl.h"#' lib/fcntl.h 
+
+    touch config.h lib/configmake.h
+}
+
+src_compile() {
+    make -f Makefile
+}
+
+src_install() {
+    make -f Makefile install PREFIX="${PREFIX}"
+}
diff --git a/sysa/coreutils-6.3/mk/main.mk b/sysa/coreutils-6.3/mk/main.mk
new file mode 100644
index 0000000..b5be74e
--- /dev/null
+++ b/sysa/coreutils-6.3/mk/main.mk
@@ -0,0 +1,105 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+PACKAGE=coreutils
+PACKAGE_NAME=GNU\ coreutils
+PACKAGE_BUGREPORT=bug-coreutils@gnu.org
+PACKAGE_VERSION=6.3
+VERSION=6.3
+
+CC      = tcc
+LD      = tcc
+AR      = tcc -ar
+
+bindir=/after/bin
+
+CFLAGS  = -I . -I lib \
+          -DPACKAGE=\"$(PACKAGE)\" \
+          -DPACKAGE_NAME=\"$(PACKAGE_NAME)\" \
+          -DGNU_PACKAGE=\"$(PACKAGE_NAME)\" \
+          -DPACKAGE_BUGREPORT=\"$(PACKAGE_BUGREPORT)\" \
+          -DPACKAGE_VERSION=\"$(PACKAGE_VERSION)\" \
+          -DHOST_OPERATING_SYSTEM=\"Linux\" \
+          -DVERSION=\"$(VERSION)\" \
+          -DHAVE_LIMITS_H=1 \
+          -DHAVE_DECL_FREE=1 \
+          -DHAVE_LONG_LONG=1 \
+          -DHAVE_UNSIGNED_LONG_LONG=1 \
+          -DHAVE_DECL_MALLOC=1 \
+          -DHAVE_DECL_STRERROR=1 \
+          -DHAVE_STRERROR=1 \
+          -DHAVE_MALLOC=1 \
+          -DHAVE_STDLIB_H=1 \
+          -DHAVE_WCHAR_H=1 \
+          -DHAVE_SYS_TYPES_H=1 \
+          -DHAVE_REALLOC=1 \
+          -DHAVE_DECL_REALLOC=1 \
+          -DHAVE_DECL_GETENV=1 \
+          -DHAVE_DIRENT_H=1 \
+          -DHAVE_DECL___FPENDING=0 \
+          -DSTDC_HEADERS=1 \
+          -DHAVE_ALLOCA_H=1 \
+          -DHAVE_STRUCT_TIMESPEC=1 \
+          -DHAVE_STRING_H=1 \
+          -DHAVE_SYS_TIME_H=1 \
+          -DHAVE_SETLOCALE=1 \
+          -DHAVE_LOCALE_H=1 \
+          -DTIME_WITH_SYS_TIME=1 \
+          -DHAVE_STDINT_H=1 \
+          -DLIBDIR=\"/after/lib\" \
+          -DHAVE_DECL_WCWIDTH=0 \
+          -DHAVE_SYS_STAT_H=1 \
+          -DHAVE_INTTYPES_H=1 \
+          -DHAVE_DECL_MEMCHR=1 \
+          -DHAVE_MEMORY_H=1 \
+          -DPENDING_OUTPUT_N_BYTES=1 \
+          -DLOCALEDIR=NULL \
+          -DHAVE_FCNTL_H=1 \
+          -DEPERM=1 \
+          -DHAVE_DECL_STRTOUL=1 \
+          -DHAVE_DECL_STRTOULL=1 \
+          -DHAVE_DECL_STRTOL=1 \
+          -DHAVE_DECL_STRTOLL=1 \
+          -DHAVE_RMDIR=1 \
+          -DRMDIR_ERRNO_NOT_EMPTY=39 \
+          -DHAVE_DECL_FREE=1 \
+          -DLSTAT_FOLLOWS_SLASHED_SYMLINK=1 \
+          -DHAVE_DECL_DIRFD=1 \
+          -DHAVE_GETCWD=1 \
+          -Dmy_strftime=nstrftime \
+          -DDIR_TO_FD\(Dir_p\)=-1 \
+          -DUTILS_OPEN_MAX=1000 \
+          -Dmajor_t=unsigned \
+          -Dminor_t=unsigned \
+          -DHAVE_GETTIMEOFDAY=1 \
+          -DHASH_ALGO_SHA256
+
+.PHONY: all install
+
+SRC_DIR=src
+
+COREUTILS =
+
+BINARIES = $(addprefix $(SRC_DIR)/, $(COREUTILS))
+
+ALL=$(BINARIES) $(SRC_DIR)/sha256sum
+all: $(BINARIES) $(SRC_DIR)/sha256sum
+
+LIB_DIR = lib
+LIB_SRC = acl alloca getdate posixtm posixver strftime getopt hash hash-pjw argmatch backupfile basename canon-host closeout cycle-check diacrit dirname dup-safer error exclude exitfail filemode __fpending file-type fnmatch fopen-safer full-read full-write getline gettime hard-locale human idcache imaxtostr linebuffer localcharset long-options mbswidth md5 memcasecmp memcoll modechange offtostr physmem quote quotearg readtokens rpmatch safe-read safe-write same save-cwd savedir settime sha256 stpcpy stripslash umaxtostr unicodeio userspec version-etc version-etc-fsf xgetcwd xgethostname xmalloc xmemcoll xnanosleep xreadlink xstrtod xstrtol xstrtoul xstrtoimax xstrtoumax yesno strnlen getcwd sig2str mountlist canonicalize mkstemp memrchr euidaccess obstack strverscmp strftime xalloc-die close-stream
+
+LIB_OBJECTS = $(addprefix $(LIB_DIR)/, $(addsuffix .o, $(LIB_SRC)))
+
+$(LIB_DIR)/libfettish.a: $(LIB_OBJECTS)
+	$(AR) cr $@ $^
+
+$(BINARIES) : % : %.o $(LIB_DIR)/libfettish.a
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $@
+
+$(SRC_DIR)/sha256sum: $(SRC_DIR)/md5sum.o $(LIB_DIR)/libfettish.a
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $@
+
+install: $(ALL)
+	install $^ $(bindir)
diff --git a/sysa/run.sh b/sysa/run.sh
index 1e9ae99..309cf15 100755
--- a/sysa/run.sh
+++ b/sysa/run.sh
@@ -54,6 +54,9 @@ build diffutils-2.7
 # Rebuild coreutils using musl
 build coreutils-5.0 coreutils-5.0.sh checksums/pass2
 
+# Build only sha256sum
+build coreutils-6.3
+
 build gawk-3.0.4
 
 build perl-5.000