diff --git a/ports/libpq/portfile.cmake b/ports/libpq/portfile.cmake
index be31beed3a..35c436a89f 100644
--- a/ports/libpq/portfile.cmake
+++ b/ports/libpq/portfile.cmake
@@ -1,7 +1,8 @@
 vcpkg_download_distfile(ARCHIVE
     URLS "https://ftp.postgresql.org/pub/source/v${VERSION}/postgresql-${VERSION}.tar.bz2"
+         "https://www.mirrorservice.org/sites/ftp.postgresql.org/source/v${VERSION}/postgresql-${VERSION}.tar.bz2"
     FILENAME "postgresql-${VERSION}.tar.bz2"
-    SHA512 dc1c8d4fbc8e53e9be91dcf1b644b3969bd634f11bf5a1c4fe16619fd386f3349a5509788d43e6a57d099ad75233026d4dd4e0bb180ffc747fd3c1a575c51a5f
+    SHA512 f2070299f0857a270317ac984f8393374cf00d4f32a082fe3c5481e36c560595ea711fed95e40d1bc90c5089edf8f165649d443d8b9c68614e1c83fc91268e96
 )
 
 vcpkg_extract_source_archive(
diff --git a/ports/libpq/unix/fix-configure.patch b/ports/libpq/unix/fix-configure.patch
index c9d453c07c..10bbbd104d 100644
--- a/ports/libpq/unix/fix-configure.patch
+++ b/ports/libpq/unix/fix-configure.patch
@@ -4,7 +4,7 @@ index 7f97248..48ff1a1 100644
 +++ b/configure.ac
 @@ -19,7 +19,8 @@ m4_pattern_forbid(^PGAC_)dnl to catch undefined macros
  
- AC_INIT([PostgreSQL], [16.3], [pgsql-bugs@lists.postgresql.org], [], [https://www.postgresql.org/])
+ AC_INIT([PostgreSQL], [16.4], [pgsql-bugs@lists.postgresql.org], [], [https://www.postgresql.org/])
  
 -m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.69], [], [m4_fatal([Autoconf version 2.69 is required.
 +cross_compiling=yes # Avoid conftest loading shared objects
diff --git a/ports/libpq/vcpkg.json b/ports/libpq/vcpkg.json
index 511e8d4aaa..7fbbd7716a 100644
--- a/ports/libpq/vcpkg.json
+++ b/ports/libpq/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "libpq",
-  "version": "16.3",
+  "version": "16.4",
   "description": "The official database access API of postgresql",
   "homepage": "https://www.postgresql.org/",
   "license": "PostgreSQL",
diff --git a/versions/baseline.json b/versions/baseline.json
index 7aa44c2d5e..9132b1b350 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -4885,7 +4885,7 @@
       "port-version": 17
     },
     "libpq": {
-      "baseline": "16.3",
+      "baseline": "16.4",
       "port-version": 0
     },
     "libpqxx": {
diff --git a/versions/l-/libpq.json b/versions/l-/libpq.json
index 1773f8d3e8..72e2dc2919 100644
--- a/versions/l-/libpq.json
+++ b/versions/l-/libpq.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "dcaa1ec8552b8ef987d6d80f708b8828bcd795eb",
+      "version": "16.4",
+      "port-version": 0
+    },
     {
       "git-tree": "e5b88c49c78feaa118b52ae4279e372aa52dbe9b",
       "version": "16.3",