diff --git a/ports/libdeflate/fix_gcc.patch b/ports/libdeflate/fix_gcc.patch
new file mode 100644
index 0000000000..5b3a593e7b
--- /dev/null
+++ b/ports/libdeflate/fix_gcc.patch
@@ -0,0 +1,21 @@
+diff --git a/lib/x86/adler32_impl.h b/lib/x86/adler32_impl.h
+index ba559e6..00967e8 100644
+--- a/lib/x86/adler32_impl.h
++++ b/lib/x86/adler32_impl.h
+@@ -52,8 +52,15 @@
+ /*
+  * AVX-VNNI implementation.  This is used on CPUs that have AVX2 and AVX-VNNI
+  * but don't have AVX-512, for example Intel Alder Lake.
++ *
++ * Unusually for a new CPU feature, gcc added support for the AVX-VNNI
++ * intrinsics (in gcc 11.1) slightly before binutils added support for
++ * assembling AVX-VNNI instructions (in binutils 2.36).  Distros can reasonably
++ * have gcc 11 with binutils 2.35.  Because of this issue, we check for gcc 12
++ * instead of gcc 11.  (libdeflate supports direct compilation without a
++ * configure step, so checking the binutils version is not always an option.)
+  */
+-#if GCC_PREREQ(11, 1) || CLANG_PREREQ(12, 0, 13000000) || MSVC_PREREQ(1930)
++#if GCC_PREREQ(12, 1) || CLANG_PREREQ(12, 0, 13000000) || MSVC_PREREQ(1930)
+ #  define adler32_x86_avx2_vnni	adler32_x86_avx2_vnni
+ #  define SUFFIX			   _avx2_vnni
+ #  define ATTRIBUTES		_target_attribute("avx2,avxvnni")
diff --git a/ports/libdeflate/portfile.cmake b/ports/libdeflate/portfile.cmake
index d1888b8069..04a34a81a2 100644
--- a/ports/libdeflate/portfile.cmake
+++ b/ports/libdeflate/portfile.cmake
@@ -6,6 +6,7 @@ vcpkg_from_github(
     HEAD_REF master
     PATCHES
         remove_wrong_c_flags_modification.diff
+        fix_gcc.patch #https://github.com/ebiggers/libdeflate/pull/366
 )
 
 vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
diff --git a/ports/libdeflate/vcpkg.json b/ports/libdeflate/vcpkg.json
index 27d0f449bc..6a527f7366 100644
--- a/ports/libdeflate/vcpkg.json
+++ b/ports/libdeflate/vcpkg.json
@@ -1,6 +1,7 @@
 {
   "name": "libdeflate",
   "version": "1.20",
+  "port-version": 1,
   "description": "libdeflate is a library for fast, whole-buffer DEFLATE-based compression and decompression.",
   "homepage": "https://github.com/ebiggers/libdeflate",
   "license": "MIT",
diff --git a/versions/baseline.json b/versions/baseline.json
index 10686d21a3..dfc6bc421b 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -4322,7 +4322,7 @@
     },
     "libdeflate": {
       "baseline": "1.20",
-      "port-version": 0
+      "port-version": 1
     },
     "libdisasm": {
       "baseline": "0.23",
diff --git a/versions/l-/libdeflate.json b/versions/l-/libdeflate.json
index 9a75513276..f28d05d7f2 100644
--- a/versions/l-/libdeflate.json
+++ b/versions/l-/libdeflate.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "3964afb8d5220a6fe2693f3cebdf85f83d3c0b1f",
+      "version": "1.20",
+      "port-version": 1
+    },
     {
       "git-tree": "021898704c19afd68d49fb56f26db8061e3c7957",
       "version": "1.20",