diff --git a/pkgs/tools/networking/libreswan/default.nix b/pkgs/tools/networking/libreswan/default.nix
index 12bd432c7329..1fc7c0fd59f4 100644
--- a/pkgs/tools/networking/libreswan/default.nix
+++ b/pkgs/tools/networking/libreswan/default.nix
@@ -1,7 +1,6 @@
 { lib
 , stdenv
 , fetchurl
-, fetchpatch
 , nixosTests
 , pkg-config
 , systemd
@@ -46,11 +45,11 @@ in
 
 stdenv.mkDerivation rec {
   pname = "libreswan";
-  version = "4.12";
+  version = "4.15";
 
   src = fetchurl {
     url = "https://download.libreswan.org/${pname}-${version}.tar.gz";
-    hash = "sha256-roWr5BX3vs9LaiuYl+FxLyflqsnDXfvd28zgrX39mfc=";
+    hash = "sha256-/mDX2zmMjuIlBV2zZeyWiiSuvLxcNQYRMfz/2tG+BK8=";
   };
 
   strictDeps = true;
@@ -115,14 +114,6 @@ stdenv.mkDerivation rec {
         -i configs/Makefile
   '';
 
-  patches = [
-    (fetchpatch {
-      name = "ignoring-return-value.patch";
-      url = "https://github.com/libreswan/libreswan/commit/ba5bad09f55959872022fa506d5ac06eafe3a314.diff";
-      hash = "sha256-xJ8rZWoRtJixamGY8sjOS+63Lw3RX7620HlRWYfvSxc=";
-    })
-  ];
-
   makeFlags = [
     "PREFIX=$(out)"
     "INITSYSTEM=systemd"