diff --git a/bypy/linux/__main__.py b/bypy/linux/__main__.py
index 025a47e02c..1c13f5b53c 100644
--- a/bypy/linux/__main__.py
+++ b/bypy/linux/__main__.py
@@ -46,7 +46,7 @@ def binary_includes():
             ('usb-1.0 mtp expat sqlite3 ffi z lzma openjp2 poppler dbus-1 iconv xml2 xslt jpeg png16'
              ' webp webpmux webpdemux exslt ncursesw readline chm hunspell-1.7 hyphen'
              ' icudata icui18n icuuc icuio stemmer gcrypt gpg-error uchardet graphite2'
-             ' brotlicommon brotlidec brotlienc'
+             ' brotlicommon brotlidec brotlienc zstd'
              ' gobject-2.0 glib-2.0 gthread-2.0 gmodule-2.0 gio-2.0 dbus-glib-1').split()
         )) + [
             # debian/ubuntu for for some typical stupid reason use libpcre.so.3
diff --git a/bypy/macos/__main__.py b/bypy/macos/__main__.py
index 497ea0828f..d0cef9a15e 100644
--- a/bypy/macos/__main__.py
+++ b/bypy/macos/__main__.py
@@ -529,7 +529,7 @@ class Freeze:
             'usb-1.0.0', 'mtp.9', 'chm.0', 'sqlite3.0', 'hunspell-1.7.0',
             'icudata.70', 'icui18n.70', 'icuio.70', 'icuuc.70', 'hyphen.0', 'uchardet.0',
             'stemmer.0', 'xslt.1', 'exslt.0', 'xml2.2', 'z.1', 'unrar', 'lzma.5',
-            'brotlicommon.1', 'brotlidec.1', 'brotlienc.1',
+            'brotlicommon.1', 'brotlidec.1', 'brotlienc.1', 'zstd.1',
             'crypto.1.1', 'ssl.1.1', 'iconv.2',  # 'ltdl.7'
         ):
             print('\nAdding', x)
diff --git a/bypy/sources.json b/bypy/sources.json
index 4580ec79f7..a8cc0dbb9d 100644
--- a/bypy/sources.json
+++ b/bypy/sources.json
@@ -106,6 +106,14 @@
         }
     },
 
+    {
+        "name": "zstd",
+        "unix": {
+            "filename": "zstd-1.5.5.tar.gz",
+            "hash": "sha256:9c4396cc829cfae319a6e2615202e82aad41372073482fce286fac78646d3ee4",
+            "urls": ["https://github.com/facebook/zstd/releases/download/v1.5.5/{filename}"]
+        }
+    },
 
     {
         "name": "expat",
@@ -853,8 +861,8 @@
         "name": "pyzstd",
 		"comment": "Needed by py7zr",
         "unix": {
-            "filename": "pyzstd-0.15.0.tar.gz",
-            "hash": "sha256:bf15a39cb3c9b662775e22ffa8c4da09fdde6a15ece5e0ed710b6d3b4329cf36",
+            "filename": "pyzstd-0.15.6.tar.gz",
+            "hash": "sha256:32a1b67d5340d8df381e718a788417455edd76bed7e8a4cbd259acdc30b5e17e",
             "urls": ["pypi"]
         }
     },
diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index ad1e223347..d504d748d6 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -96,6 +96,12 @@ class BuildTest(unittest.TestCase):
         import lzma
         lzma.open
 
+    def test_zstd(self):
+        from pyzstd import compress, decompress
+        data = os.urandom(4096)
+        cdata = compress(data)
+        self.assertEqual(data, decompress(cdata))
+
     def test_html5lib(self):
         import html5lib.html5parser  # noqa
         from html5lib import parse  # noqa