diff --git a/pkgs/by-name/li/libreswan/package.nix b/pkgs/by-name/li/libreswan/package.nix
index 3c01d04146fe..5fb6c5f395d5 100644
--- a/pkgs/by-name/li/libreswan/package.nix
+++ b/pkgs/by-name/li/libreswan/package.nix
@@ -51,11 +51,11 @@ in
 
 stdenv.mkDerivation rec {
   pname = "libreswan";
-  version = "5.2";
+  version = "5.3";
 
   src = fetchurl {
     url = "https://download.libreswan.org/${pname}-${version}.tar.gz";
-    hash = "sha256-w4K72DjCOfjUxOnMMg86vzT3sI5x2eeO0CmpbZY5QM4=";
+    hash = "sha256-wdNQw/Mpb9IbnbB5TiPT8xmykviAv4F4uC71xjkcYMA=";
   };
 
   strictDeps = true;
@@ -103,6 +103,9 @@ stdenv.mkDerivation rec {
     "TMPFILESDIR=$(out)/lib/tmpfiles.d/"
     "LINUX_VARIANT=nixos"
     "DEFAULT_DNSSEC_ROOTKEY_FILE=${dns-root-data}/root.key"
+    # Fix invalid XML files with libxml 2.14
+    "XMLTO_FLAGS=--searchpath=$(abs_srcdir)/d.ipsec.conf:$(abs_srcdir)"
+    "XMLTO_FLAGS+=--skip-validation"
   ];
 
   # Hack to make install work