diff --git a/NEWS b/NEWS
index 36f955ebe..a3893089c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,63 +1,93 @@
 NEWS
 ----
 
-# User visible changes in `mruby3.2`
+# User visible changes in `mruby3.3` from `mruby3.2`
 
 # The language
 
-- Now `a::B = c` should evaluate `a` then `c`.
-- Anonymous arguments `*`, `**`, `&` can be passed for forwarding.
-- Multi-precision integer is available now via `mruby-bigint` gem.
+- aliases work properly with `super`
+- `callee` method work differently with aliases in mruby
+- define `Kernel#respond_to_missing?` method
+- `_inspect` method (`inspect` with recursive check) is removed
+- `__printstr` method is removed; use `print` instead
+
+# Configuration
+
+- mruby can be built using Docker now. Try `docker-compose build` for example.
+- New Platform: Nintendo Wii
+- Improved Platforms: Android, Dreamcast
+
+# mruby memory API
+
+- `mrb_default_allocf` can be overridden by the application
+- `mrb_open_allocf` will be deprecated
 
 # mruby VM and bytecode
 
-- `OP_ARYDUP` was renamed to `OP_ARYSPLAT`. The instruction name
-  was changed but instruction number and basic behavior have not
-  changed (except that `ARYDUP nil` makes `[]`).
+- [#5870](https://github.com/mruby/mruby/issues/5870) Use OP_LOADINEG instead of OP_LOADI
 
-# Tools
+# Changes in mrbgems
 
-## `mruby`
+- mruby-bin-config: new options --cxx,--cxxflags,--as,--asflags,--objc,--objcflags
+- mruby-binding-eval (merged with mruby-eval) #5989
+- mruby-binding: renamed from mruby-binding-core
+- mruby-enumerator: remove internal attribute methods obj, args, kwd, meth, fib.
+- mruby-fiber: Add a new mrb_fiber_new() with MRB_API
+- mruby-fiber: Allows calling `Fiber#resume` from C
+- mruby-fiber: `Fiber#to_s` format changed
+- mruby-io: Add "x" mode option for IO.open
+- mruby-method: `Method#to_s` format changed
+- mruby-pack: support new directives j,J,b,B
+- mruby-range-ext: new method `Range#overlap?`
+- mruby-string-ext: Add `String#valid_encoding?` method
 
-- `-b` only specifies the script is the binary. The files loaded by `-r` are not affected by the option.
-- `mruby` now loads complied binary if the suffix is `.mrb`.
+# Bugs Fixed
 
-## `mrbc`
+- [#5712](https://github.com/mruby/mruby/issues/5712) No "make install"
+- [#5724](https://github.com/mruby/mruby/issues/5724) Rational#** is missing
+- [#5725](https://github.com/mruby/mruby/issues/5725) weird const_missing exceptions in mrblib code
+- [#5789](https://github.com/mruby/mruby/issues/5789) No memory release of backtrace information due to stack error
+- [#5943](https://github.com/mruby/mruby/issues/5943) TCPSocket#write is failed
+- [#5944](https://github.com/mruby/mruby/issues/5944) Behavior of calling method with a hash variable
+- [#5949](https://github.com/mruby/mruby/issues/5949) Caller appears to report wrong line when block passed and brackets omitted
+- [#5974](https://github.com/mruby/mruby/issues/5974) Invalid escape sequences in gem_init.c on windows
+- [#5975](https://github.com/mruby/mruby/issues/5975) Equals comparison fails on extreme ends of 64-bit integers
+- [#5985](https://github.com/mruby/mruby/issues/5985) Sign extension with OP_LOADI32 in get_int_operand()
+- [#5986](https://github.com/mruby/mruby/issues/5986) Fix bugs in String#bytesplice
+- [#5987](https://github.com/mruby/mruby/issues/5987) ~(-1 << 64) is incorrect
+- [#5991](https://github.com/mruby/mruby/issues/5991) 'gets' method not working in mruby-3.2.0
+- [#5995](https://github.com/mruby/mruby/issues/5995) One seemingly unnecessary parameter is passed in the block parameters
+- [#6029](https://github.com/mruby/mruby/issues/6029) mruby build fails under mrbgems directory
+- [#6041](https://github.com/mruby/mruby/issues/6041) GC Performance may have degraded
+- [#6051](https://github.com/mruby/mruby/issues/6051) Null pointer dereference in mrb_addrinfo_unix_path
+- [#6052](https://github.com/mruby/mruby/issues/6052) Null pointer dereference while handling the Proc class
+- [#6065](https://github.com/mruby/mruby/issues/6065) Null pointer dereference while handling the Proc class
+- [#6066](https://github.com/mruby/mruby/issues/6066) Null pointer dereference involving Struct.new()
+- [#6067](https://github.com/mruby/mruby/issues/6067) Null pointer dereference in mrb_string_value_cstr
+- [#6068](https://github.com/mruby/mruby/issues/6068) Stack overflow in mrb_vm_exec
+- [#6087](https://github.com/mruby/mruby/issues/6087) 'Remote branch HEAD not found in upstream origin' error on build
+- [#6089](https://github.com/mruby/mruby/issues/6089) binding.eval() handles def expressions differently from CRuby
+- [#6098](https://github.com/mruby/mruby/issues/6098) Fails to call superclass of wrapped method
+- [#6108](https://github.com/mruby/mruby/issues/6108) VM crashes with break
+- [#6134](https://github.com/mruby/mruby/issues/6134) String#unpack1 returns an array instead of a single string
 
-- Add `--no-optimize` option to disable optimization.
+# Pull Requests (User Visible Ones)
 
-# mrbgems
-
-## mruby-class-ext
-
-- Add `Class#subclasses` method.
-- Add `Module#undefined_instance_methods` method.
-
-## New bundled gems
-
-- mruby-errno from [https://github.com/iij/mruby-errno.git]
-- mruby-set from [https://github.com/yui-knk/mruby-set.git]
-- mruby-dir from [https://github.com/iij/mruby-dir.git]
-
-# CVEs
-
-Following CVEs are fixed.
-
-- [CVE-2022-0080](https://nvd.nist.gov/vuln/detail/CVE-2022-0080)
-- [CVE-2022-0240](https://nvd.nist.gov/vuln/detail/CVE-2022-0240)
-- [CVE-2022-0326](https://nvd.nist.gov/vuln/detail/CVE-2022-0326)
-- [CVE-2022-0481](https://nvd.nist.gov/vuln/detail/CVE-2022-0481)
-- [CVE-2022-0525](https://nvd.nist.gov/vuln/detail/CVE-2022-0525)
-- [CVE-2022-0570](https://nvd.nist.gov/vuln/detail/CVE-2022-0570)
-- [CVE-2022-0614](https://nvd.nist.gov/vuln/detail/CVE-2022-0614)
-- [CVE-2022-0623](https://nvd.nist.gov/vuln/detail/CVE-2022-0623)
-- [CVE-2022-0630](https://nvd.nist.gov/vuln/detail/CVE-2022-0630)
-- [CVE-2022-0631](https://nvd.nist.gov/vuln/detail/CVE-2022-0631)
-- [CVE-2022-0632](https://nvd.nist.gov/vuln/detail/CVE-2022-0632)
-- [CVE-2022-0717](https://nvd.nist.gov/vuln/detail/CVE-2022-0717)
-- [CVE-2022-0890](https://nvd.nist.gov/vuln/detail/CVE-2022-0890)
-- [CVE-2022-1106](https://nvd.nist.gov/vuln/detail/CVE-2022-1106)
-- [CVE-2022-1212](https://nvd.nist.gov/vuln/detail/CVE-2022-1212)
-- [CVE-2022-1276](https://nvd.nist.gov/vuln/detail/CVE-2022-1276)
-- [CVE-2022-1286](https://nvd.nist.gov/vuln/detail/CVE-2022-1286)
-- [CVE-2022-1934](https://nvd.nist.gov/vuln/detail/CVE-2022-1934)
+- [#5870](https://github.com/mruby/mruby/pull/5870) Use OP_LOADINEG instead of OP_LOADI
+- [#5966](https://github.com/mruby/mruby/pull/5966) Update default.gembox add mruby debugger mrdb
+- [#5979](https://github.com/mruby/mruby/pull/5979) Allow Class#allocate to be prohibited
+- [#5989](https://github.com/mruby/mruby/pull/5989) Integrate mruby-binding-eval into mruby-eval
+- [#5961](https://github.com/mruby/mruby/pull/5961) Add Docker to build and run all mruby tests. Run pre-commit and generate YARD docs with Docker
+- [#6008](https://github.com/mruby/mruby/pull/6008) Make "bintest" independent of directory
+- [#6009](https://github.com/mruby/mruby/pull/6009) Avoid adding <MRUBY_ROOT>/bintest which does not exist
+- [#6012](https://github.com/mruby/mruby/pull/6012) Allow tests to be disabled for specific gems; warn about disabled tests
+- [#6013](https://github.com/mruby/mruby/pull/6013) Fix Android toolchain
+- [#6032](https://github.com/mruby/mruby/pull/6032) Rake: update task clean to remove bin and build folders
+- [#6045](https://github.com/mruby/mruby/pull/6045) Fixes escape sequence bug and enhancements in Presym scanning
+- [#6076](https://github.com/mruby/mruby/pull/6076) Fixed unwinding block that could point to invalid PC
+- [#6081](https://github.com/mruby/mruby/pull/6081) Add "x" mode option for IO.open
+- [#6086](https://github.com/mruby/mruby/pull/6086) Add build config for Nintendo Wii
+- [#6097](https://github.com/mruby/mruby/pull/6097) Add a new mrb_fiber_new() with MRB_API
+- [#6106](https://github.com/mruby/mruby/pull/6106) Ease fiber limitations
+- [#6118](https://github.com/mruby/mruby/pull/6118) Fixed IO#read with buf
+- [#6120](https://github.com/mruby/mruby/pull/6120) Set EBADF if check_file_descriptor() fails
diff --git a/doc/mruby3.3.md b/doc/mruby3.3.md
new file mode 100644
index 000000000..5fc5ca4eb
--- /dev/null
+++ b/doc/mruby3.3.md
@@ -0,0 +1,90 @@
+# User visible changes in `mruby3.3` from `mruby3.2`
+
+# The language
+
+- aliases work properly with `super`
+- `callee` method work differently with aliases in mruby
+- define `Kernel#respond_to_missing?` method
+- `_inspect` method (`inspect` with recursive check) is removed
+- `__printstr` method is removed; use `print` instead
+
+# Configuration
+
+- mruby can be built using Docker now. Try `docker-compose build` for example.
+- New Platform: Nintendo Wii
+- Improved Platforms: Android, Dreamcast
+
+# mruby memory API
+
+- `mrb_default_allocf` can be overridden by the application
+- `mrb_open_allocf` will be deprecated
+
+# mruby VM and bytecode
+
+- [#5870](https://github.com/mruby/mruby/issues/5870) Use OP_LOADINEG instead of OP_LOADI
+
+# Changes in mrbgems
+
+- mruby-bin-config: new options --cxx,--cxxflags,--as,--asflags,--objc,--objcflags
+- mruby-binding-eval (merged with mruby-eval) #5989
+- mruby-binding: renamed from mruby-binding-core
+- mruby-enumerator: remove internal attribute methods obj, args, kwd, meth, fib.
+- mruby-fiber: Add a new mrb_fiber_new() with MRB_API
+- mruby-fiber: Allows calling `Fiber#resume` from C
+- mruby-fiber: `Fiber#to_s` format changed
+- mruby-io: Add "x" mode option for IO.open
+- mruby-method: `Method#to_s` format changed
+- mruby-pack: support new directives j,J,b,B
+- mruby-range-ext: new method `Range#overlap?`
+- mruby-string-ext: Add `String#valid_encoding?` method
+
+# Bugs Fixed
+
+- [#5712](https://github.com/mruby/mruby/issues/5712) No "make install"
+- [#5724](https://github.com/mruby/mruby/issues/5724) Rational#\*\* is missing
+- [#5725](https://github.com/mruby/mruby/issues/5725) weird const_missing exceptions in mrblib code
+- [#5789](https://github.com/mruby/mruby/issues/5789) No memory release of backtrace information due to stack error
+- [#5943](https://github.com/mruby/mruby/issues/5943) TCPSocket#write is failed
+- [#5944](https://github.com/mruby/mruby/issues/5944) Behavior of calling method with a hash variable
+- [#5949](https://github.com/mruby/mruby/issues/5949) Caller appears to report wrong line when block passed and brackets omitted
+- [#5974](https://github.com/mruby/mruby/issues/5974) Invalid escape sequences in gem_init.c on windows
+- [#5975](https://github.com/mruby/mruby/issues/5975) Equals comparison fails on extreme ends of 64-bit integers
+- [#5985](https://github.com/mruby/mruby/issues/5985) Sign extension with OP_LOADI32 in get_int_operand()
+- [#5986](https://github.com/mruby/mruby/issues/5986) Fix bugs in String#bytesplice
+- [#5987](https://github.com/mruby/mruby/issues/5987) ~(-1 << 64) is incorrect
+- [#5991](https://github.com/mruby/mruby/issues/5991) 'gets' method not working in mruby-3.2.0
+- [#5995](https://github.com/mruby/mruby/issues/5995) One seemingly unnecessary parameter is passed in the block parameters
+- [#6029](https://github.com/mruby/mruby/issues/6029) mruby build fails under mrbgems directory
+- [#6041](https://github.com/mruby/mruby/issues/6041) GC Performance may have degraded
+- [#6051](https://github.com/mruby/mruby/issues/6051) Null pointer dereference in mrb_addrinfo_unix_path
+- [#6052](https://github.com/mruby/mruby/issues/6052) Null pointer dereference while handling the Proc class
+- [#6065](https://github.com/mruby/mruby/issues/6065) Null pointer dereference while handling the Proc class
+- [#6066](https://github.com/mruby/mruby/issues/6066) Null pointer dereference involving Struct.new()
+- [#6067](https://github.com/mruby/mruby/issues/6067) Null pointer dereference in mrb_string_value_cstr
+- [#6068](https://github.com/mruby/mruby/issues/6068) Stack overflow in mrb_vm_exec
+- [#6087](https://github.com/mruby/mruby/issues/6087) 'Remote branch HEAD not found in upstream origin' error on build
+- [#6089](https://github.com/mruby/mruby/issues/6089) binding.eval() handles def expressions differently from CRuby
+- [#6098](https://github.com/mruby/mruby/issues/6098) Fails to call superclass of wrapped method
+- [#6108](https://github.com/mruby/mruby/issues/6108) VM crashes with break
+- [#6134](https://github.com/mruby/mruby/issues/6134) String#unpack1 returns an array instead of a single string
+
+# Pull Requests (User Visible Ones)
+
+- [#5870](https://github.com/mruby/mruby/pull/5870) Use OP_LOADINEG instead of OP_LOADI
+- [#5966](https://github.com/mruby/mruby/pull/5966) Update default.gembox add mruby debugger mrdb
+- [#5979](https://github.com/mruby/mruby/pull/5979) Allow Class#allocate to be prohibited
+- [#5989](https://github.com/mruby/mruby/pull/5989) Integrate mruby-binding-eval into mruby-eval
+- [#5961](https://github.com/mruby/mruby/pull/5961) Add Docker to build and run all mruby tests. Run pre-commit and generate YARD docs with Docker
+- [#6008](https://github.com/mruby/mruby/pull/6008) Make "bintest" independent of directory
+- [#6009](https://github.com/mruby/mruby/pull/6009) Avoid adding <MRUBY_ROOT>/bintest which does not exist
+- [#6012](https://github.com/mruby/mruby/pull/6012) Allow tests to be disabled for specific gems; warn about disabled tests
+- [#6013](https://github.com/mruby/mruby/pull/6013) Fix Android toolchain
+- [#6032](https://github.com/mruby/mruby/pull/6032) Rake: update task clean to remove bin and build folders
+- [#6045](https://github.com/mruby/mruby/pull/6045) Fixes escape sequence bug and enhancements in Presym scanning
+- [#6076](https://github.com/mruby/mruby/pull/6076) Fixed unwinding block that could point to invalid PC
+- [#6081](https://github.com/mruby/mruby/pull/6081) Add "x" mode option for IO.open
+- [#6086](https://github.com/mruby/mruby/pull/6086) Add build config for Nintendo Wii
+- [#6097](https://github.com/mruby/mruby/pull/6097) Add a new mrb_fiber_new() with MRB_API
+- [#6106](https://github.com/mruby/mruby/pull/6106) Ease fiber limitations
+- [#6118](https://github.com/mruby/mruby/pull/6118) Fixed IO#read with buf
+- [#6120](https://github.com/mruby/mruby/pull/6120) Set EBADF if check_file_descriptor() fails
diff --git a/mrbgems/mruby-pack/README.md b/mrbgems/mruby-pack/README.md
index d108f2a09..2871fb4b3 100644
--- a/mrbgems/mruby-pack/README.md
+++ b/mrbgems/mruby-pack/README.md
@@ -45,7 +45,9 @@ There is no dependency on other mrbgems.
 - V : 32-bit unsigned, VAX (little-endian) byte order
 - v : 16-bit unsigned, VAX (little-endian) byte order
 - x : null byte
+- X : back up bytes
 - Z : same as "a", except that null is added with \*
+- @ : absolute position
 
 ## License
 
diff --git a/mrbgems/mruby-pack/src/pack.c b/mrbgems/mruby-pack/src/pack.c
index 75d8e1a94..743b8663b 100644
--- a/mrbgems/mruby-pack/src/pack.c
+++ b/mrbgems/mruby-pack/src/pack.c
@@ -291,27 +291,24 @@ static void
 u64tostr(char *buf, size_t len, uint64_t n)
 {
 #ifdef MRB_NO_STDIO
-  char *bufend = buf + len;
-  char *p = bufend - 1;
+  mrb_assert(len > 0);
 
-  if (len < 1) {
+  if (n < 10) {
+    buf[0] = '0' + n;
+    buf[1] = '\0';
     return;
   }
 
+  char *bufend = buf + len;
+  char *p = bufend - 1;
+
   *p-- = '\0';
   len--;
 
-  if (n > 0) {
-    for (; len > 0 && n > 0; len--, n /= 10) {
-      *p-- = '0' + (n % 10);
-    }
-    p++;
+  for (; len > 0 && n > 0; len--, n /= 10) {
+    *p-- = '0' + (n % 10);
   }
-  else if (len > 0) {
-    *p = '0';
-    len--;
-  }
-
+  p++;
   memmove(buf, p, bufend - p);
 #else
   snprintf(buf, len, "%" PRIu64, n);
@@ -323,9 +320,7 @@ static void
 i64tostr(char *buf, size_t len, int64_t n)
 {
 #ifdef MRB_NO_STDIO
-  if (len < 1) {
-    return;
-  }
+  mrb_assert(len > 0);
 
   if (n < 0) {
     *buf++ = '-';
@@ -731,7 +726,7 @@ unpack_str(mrb_state *mrb, const void *src, int slen, mrb_value ary, int count,
   CHECK_UNPACK_LEN(mrb, slen, ary);
 
   mrb_value dst;
-  const char *cp, *sptr;
+  const char *sptr;
   int copylen;
 
   sptr = (const char*)src;
@@ -741,6 +736,8 @@ unpack_str(mrb_state *mrb, const void *src, int slen, mrb_value ary, int count,
   copylen = slen;
 
   if (slen >= 0 && flags & PACK_FLAG_Z) {  /* "Z" */
+    const char *cp;
+
     if ((cp = (const char*)memchr(sptr, '\0', slen)) != NULL) {
       copylen = (int)(cp - sptr);
       if (count == -1) {
@@ -764,7 +761,6 @@ unpack_str(mrb_state *mrb, const void *src, int slen, mrb_value ary, int count,
 static int
 pack_hex(mrb_state *mrb, mrb_value src, mrb_value dst, mrb_int didx, int count, unsigned int flags)
 {
-  int a, b;
   unsigned int ashift, bshift;
   long slen;
   char *dptr, *dptr0, *sptr;
@@ -793,7 +789,8 @@ pack_hex(mrb_state *mrb, mrb_value src, mrb_value dst, mrb_int didx, int count,
 
   dptr0 = dptr;
   for (; count > 0; count -= 2) {
-    a = b = 0;
+    int a = 0, b = 0;
+
     if (slen > 0) {
       a = hex2int(*sptr++);
       if (a < 0) break;
@@ -1667,18 +1664,23 @@ pack_unpack(mrb_state *mrb, mrb_value str, int single)
     switch (dir) {
     case PACK_DIR_HEX:
       srcidx += unpack_hex(mrb, sptr, srclen - srcidx, result, count, flags);
+      if (single) goto single_return;
       continue;
     case PACK_DIR_BSTR:
       srcidx += unpack_bstr(mrb, sptr, srclen - srcidx, result, count, flags);
+      if (single) goto single_return;
       continue;
     case PACK_DIR_STR:
       srcidx += unpack_str(mrb, sptr, srclen - srcidx, result, count, flags);
+      if (single) goto single_return;
       continue;
     case PACK_DIR_BASE64:
       srcidx += unpack_base64(mrb, sptr, srclen - srcidx, result);
+      if (single) goto single_return;
       continue;
     case PACK_DIR_QENC:
       srcidx += unpack_qenc(mrb, sptr, srclen - srcidx, result);
+      if (single) goto single_return;
       continue;
     default:
       break;
@@ -1729,6 +1731,7 @@ pack_unpack(mrb_state *mrb, mrb_value str, int single)
     }
   }
   if (single) {
+  single_return:
     if (RARRAY_LEN(result) > 0) {
       return RARRAY_PTR(result)[0];
     }
diff --git a/mrbgems/mruby-pack/test/pack.rb b/mrbgems/mruby-pack/test/pack.rb
index 6045f788f..a3f110ba8 100644
--- a/mrbgems/mruby-pack/test/pack.rb
+++ b/mrbgems/mruby-pack/test/pack.rb
@@ -156,3 +156,18 @@ assert 'pack/unpack "U"' do
   assert_raise(RangeError) { [-1].pack("U") }
   assert_raise(RangeError) { [0x40000000].pack("U") }
 end
+
+assert 'unpack1' do
+  d = 1234
+  assert_equal(d, [d].pack("i").unpack1("i"))
+  d = "foobar"
+  assert_equal(d, [d].pack("a*").unpack1("a*"))
+  assert_equal(d, [d].pack("A*").unpack1("A*"))
+  assert_equal(d, [d].pack("Z*").unpack1("Z*"))
+  assert_equal(d, [d].pack("m").unpack1("m"))
+  assert_equal(d, [d].pack("M").unpack1("M"))
+  d = "10010101"
+  assert_equal(d, [d].pack("b*").unpack1("b*"))
+  d = "f00b00"
+  assert_equal(d, [d].pack("h*").unpack1("h*"))
+end