diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 55ab977e97..b5026f7829 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -400,10 +400,6 @@ msgstr ""
 msgid "3-arg pow() not supported"
 msgstr ""
 
-#: shared-module/msgpack/__init__.c
-msgid "64 bit types"
-msgstr ""
-
 #: ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c
 #: ports/atmel-samd/common-hal/countio/Counter.c
 #: ports/atmel-samd/common-hal/rotaryio/IncrementalEncoder.c
@@ -1271,6 +1267,10 @@ msgstr ""
 msgid "Invalid data_pins[%d]"
 msgstr ""
 
+#: shared-module/msgpack/__init__.c
+msgid "Invalid format"
+msgstr ""
+
 #: shared-module/audiocore/WaveFile.c
 msgid "Invalid format chunk size"
 msgstr ""
diff --git a/shared-module/msgpack/__init__.c b/shared-module/msgpack/__init__.c
index d32550722c..3a34731d77 100644
--- a/shared-module/msgpack/__init__.c
+++ b/shared-module/msgpack/__init__.c
@@ -102,6 +102,16 @@ STATIC uint32_t read4(msgpack_stream_t *s) {
     return res;
 }
 
+STATIC uint64_t read8(msgpack_stream_t *s) {
+    uint64_t res = 0;
+    read(s, &res, 8);
+    int n = 1;
+    if (*(char *)&n == 1) {
+        res = __builtin_bswap64(res);
+    }
+    return res;
+}
+
 STATIC size_t read_size(msgpack_stream_t *s, uint8_t len_index) {
     size_t res = 0;
     switch (len_index) {
@@ -207,7 +217,7 @@ STATIC void pack_bin(msgpack_stream_t *s, const uint8_t *data, size_t len) {
     }
 }
 
-STATIC void  pack_ext(msgpack_stream_t *s, int8_t code, const uint8_t *data, size_t len) {
+STATIC void pack_ext(msgpack_stream_t *s, int8_t code, const uint8_t *data, size_t len) {
     if (len == 1) {
         write1(s, 0xd4);
     } else if (len == 2) {
@@ -424,22 +434,39 @@ STATIC mp_obj_t unpack(msgpack_stream_t *s, mp_obj_t ext_hook, bool use_list) {
             return unpack_bytes(s, read_size(s, code - 0xc4));
         }
         case 0xcc: // uint8
+            return MP_OBJ_NEW_SMALL_INT((uint8_t)read1(s));
         case 0xd0: // int8
             return MP_OBJ_NEW_SMALL_INT((int8_t)read1(s));
         case 0xcd: // uint16
+            return MP_OBJ_NEW_SMALL_INT((uint16_t)read2(s));
         case 0xd1: // int16
             return MP_OBJ_NEW_SMALL_INT((int16_t)read2(s));
         case 0xce: // uint32
+            return mp_obj_new_int_from_uint((uint32_t)read4(s));
         case 0xd2: // int32
-            return MP_OBJ_NEW_SMALL_INT((int32_t)read4(s));
-        case 0xca: {
-            union Float { mp_float_t f;
-                          uint32_t u;
+            return mp_obj_new_int((int32_t)read4(s));
+        case 0xcf: // uint 64
+            return mp_obj_new_int_from_ull((uint64_t)read8(s));
+        case 0xd3: // int 64
+            return mp_obj_new_int_from_ll((int64_t)read8(s));
+        case 0xca: { // float
+            union Float {
+                mp_float_t f;
+                uint32_t u;
             };
             union Float data;
             data.u = read4(s);
             return mp_obj_new_float(data.f);
         }
+        case 0xcb: { // double
+            union Double {
+                uint64_t u;
+                double d;
+            };
+            union Double data;
+            data.u = read8(s);
+            return mp_obj_new_float_from_d(data.d);
+        }
         case 0xd9:
         case 0xda:
         case 0xdb: {
@@ -483,11 +510,8 @@ STATIC mp_obj_t unpack(msgpack_stream_t *s, mp_obj_t ext_hook, bool use_list) {
             // ext 8, 16, 32
             return unpack_ext(s, read_size(s, code - 0xc7), ext_hook);
         case 0xc1:      // never used
-        case 0xcb:      // float 64
-        case 0xcf:      // uint 64
-        case 0xd3:      // int 64
         default:
-            mp_raise_NotImplementedError(translate("64 bit types"));
+            mp_raise_ValueError(translate("Invalid format"));
     }
 }