diff --git a/patches/gmp.patch b/patches/gmp.patch
deleted file mode 100644
index 0719a8a..0000000
--- a/patches/gmp.patch
+++ /dev/null
@@ -1,15 +0,0 @@
---- a/mpz/inp_raw.c	Tue Dec 22 23:49:51 2020 +0100
-+++ b/mpz/inp_raw.c	Thu Oct 21 19:06:49 2021 +0200
-@@ -88,8 +88,11 @@
- 
-   abs_csize = ABS (csize);
- 
-+  if (UNLIKELY (abs_csize > ~(mp_bitcnt_t) 0 / 8))
-+    return 0; /* Bit size overflows */
-+
-   /* round up to a multiple of limbs */
--  abs_xsize = BITS_TO_LIMBS (abs_csize*8);
-+  abs_xsize = BITS_TO_LIMBS ((mp_bitcnt_t) abs_csize * 8);
- 
-   if (abs_xsize != 0)
-     {
diff --git a/scripts/build-ffmpeg.py b/scripts/build-ffmpeg.py
index 8da6f6c..2861491 100644
--- a/scripts/build-ffmpeg.py
+++ b/scripts/build-ffmpeg.py
@@ -86,7 +86,7 @@
         # libraries
         Package(
             name="xz",
-            source_url="https://tukaani.org/xz/xz-5.2.5.tar.bz2",
+            source_url="https://tukaani.org/xz/xz-5.4.4.tar.bz2",
             build_arguments=[
                 "--disable-doc",
                 "--disable-lzma-links",
@@ -100,7 +100,7 @@
         ),
         Package(
             name="gmp",
-            source_url="https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz",
+            source_url="https://ftp.gnu.org/gnu/gmp/gmp-6.3.0.tar.xz",
             # out-of-tree builds fail on Windows
             build_dir=".",
         ),
@@ -113,17 +113,17 @@
         Package(
             name="xml2",
             requires=["xz"],
-            source_url="https://download.gnome.org/sources/libxml2/2.9/libxml2-2.9.13.tar.xz",
+            source_url="https://download.gnome.org/sources/libxml2/2.11/libxml2-2.11.5.tar.xz",
             build_arguments=["--without-python"],
         ),
         Package(
             name="unistring",
-            source_url="https://ftp.gnu.org/gnu/libunistring/libunistring-0.9.10.tar.gz",
+            source_url="https://ftp.gnu.org/gnu/libunistring/libunistring-1.1.tar.xz",
         ),
         Package(
             name="freetype",
             requires=["png"],
-            source_url="https://download.savannah.gnu.org/releases/freetype/freetype-2.10.1.tar.gz",
+            source_url="https://download.savannah.gnu.org/releases/freetype/freetype-2.13.2.tar.xz",
             # At this point we have not built our own harfbuzz and we do NOT want to
             # pick up the system's harfbuzz.
             build_arguments=["--with-harfbuzz=no"],
@@ -131,17 +131,17 @@
         Package(
             name="fontconfig",
             requires=["freetype", "xml2"],
-            source_url="https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.13.1.tar.bz2",
+            source_url="https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.14.2.tar.xz",
             build_arguments=["--disable-nls", "--enable-libxml2"],
         ),
         Package(
             name="fribidi",
-            source_url="https://github.com/fribidi/fribidi/releases/download/v1.0.11/fribidi-1.0.11.tar.xz",
+            source_url="https://github.com/fribidi/fribidi/releases/download/v1.0.13/fribidi-1.0.13.tar.xz",
         ),
         Package(
             name="harfbuzz",
             requires=["freetype"],
-            source_url="https://github.com/harfbuzz/harfbuzz/releases/download/4.1.0/harfbuzz-4.1.0.tar.xz",
+            source_url="https://github.com/harfbuzz/harfbuzz/releases/download/8.2.2/harfbuzz-8.2.2.tar.xz",
             build_arguments=[
                 "--with-cairo=no",
                 "--with-chafa=no",
@@ -158,7 +158,7 @@
             Package(
                 name="nettle",
                 requires=["gmp"],
-                source_url="https://ftp.gnu.org/gnu/nettle/nettle-3.7.3.tar.gz",
+                source_url="https://ftp.gnu.org/gnu/nettle/nettle-3.9.1.tar.gz",
                 build_arguments=["--disable-documentation"],
                 # build randomly fails with "*** missing separator.  Stop."
                 build_parallel=False,
@@ -166,7 +166,7 @@
             Package(
                 name="gnutls",
                 requires=["nettle", "unistring"],
-                source_url="https://www.gnupg.org/ftp/gcrypt/gnutls/v3.7/gnutls-3.7.3.tar.xz",
+                source_url="https://www.gnupg.org/ftp/gcrypt/gnutls/v3.8/gnutls-3.8.1.tar.xz",
                 build_arguments=[
                     "--disable-cxx",
                     "--disable-doc",