diff --git a/dev-util/librnp/files/librnp-0.18.1-fix-build-with-botan-3.11.patch b/dev-util/librnp/files/librnp-0.18.1-fix-build-with-botan-3.11.patch
new file mode 100644
index 0000000000000..b2713edab7734
--- /dev/null
+++ b/dev-util/librnp/files/librnp-0.18.1-fix-build-with-botan-3.11.patch
@@ -0,0 +1,22 @@
+From fb7e0400a72344048d467c967bb3218a6106e595 Mon Sep 17 00:00:00 2001
+From: Markus Theil <markus.theil@secunet.com>
+Date: Mon, 16 Mar 2026 13:14:29 +0100
+Subject: [PATCH] fix build with Botan 3.11
+
+Signed-off-by: Markus Theil <markus.theil@secunet.com>
+---
+ src/lib/crypto/mem.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/lib/crypto/mem.cpp b/src/lib/crypto/mem.cpp
+index 94d90f5484..dbd2a143ed 100644
+--- a/src/lib/crypto/mem.cpp
++++ b/src/lib/crypto/mem.cpp
+@@ -25,6 +25,7 @@
+  */
+ 
+ #include <cstdio>
++#include <cstring>
+ #include "mem.h"
+ #include "logging.h"
+ #include <botan/ffi.h>
diff --git a/dev-util/librnp/files/librnp-0.18.1-switch-defines-for-botan-3.11.patch b/dev-util/librnp/files/librnp-0.18.1-switch-defines-for-botan-3.11.patch
new file mode 100644
index 0000000000000..dcdf68743e7ac
--- /dev/null
+++ b/dev-util/librnp/files/librnp-0.18.1-switch-defines-for-botan-3.11.patch
@@ -0,0 +1,28 @@
+diff '--color=auto' -Naur a/src/lib/crypto/ec.cpp b/src/lib/crypto/ec.cpp
+--- a/src/lib/crypto/ec.cpp	2025-11-21 15:12:02.000000000 +0200
++++ b/src/lib/crypto/ec.cpp	2026-04-04 08:22:12.502593507 +0300
+@@ -40,6 +40,10 @@
+ #include "botan/ecdh.h"
+ #include <cassert>
+ #endif
++#include <botan/version.h>
++#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(3, 11, 0)
++#include <botan/ec_group.h>
++#endif
+ 
+ namespace pgp {
+ namespace ec {
+diff '--color=auto' -Naur a/src/lib/crypto/exdsa_ecdhkem.cpp b/src/lib/crypto/exdsa_ecdhkem.cpp
+--- a/src/lib/crypto/exdsa_ecdhkem.cpp	2025-11-21 15:12:02.000000000 +0200
++++ b/src/lib/crypto/exdsa_ecdhkem.cpp	2026-04-04 08:34:49.684582995 +0300
+@@ -34,6 +34,10 @@
+ #include "string.h"
+ #include "utils.h"
+ #include <cassert>
++#include <botan/version.h>
++#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(3, 11, 0)
++#include <botan/ec_group.h>
++#endif
+ 
+ ec_key_t::~ec_key_t()
+ {
diff --git a/dev-util/librnp/librnp-0.18.1.ebuild b/dev-util/librnp/librnp-0.18.1.ebuild
index 46b02dcc6705b..a46e935bc2a8b 100644
--- a/dev-util/librnp/librnp-0.18.1.ebuild
+++ b/dev-util/librnp/librnp-0.18.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2022-2025 Gentoo Authors
+# Copyright 2022-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -27,6 +27,9 @@ DEPEND="${RDEPEND}
 	test? ( dev-cpp/gtest )"
 BDEPEND="man? ( dev-ruby/asciidoctor )"
 
+PATCHES=( "${FILESDIR}"/librnp-0.18.1-fix-build-with-botan-3.11.patch
+	"${FILESDIR}"/librnp-0.18.1-switch-defines-for-botan-3.11.patch )
+
 src_configure() {
 	local mycmakeargs=(
 		-DBUILD_TESTING=$(usex test on off)