diff --git a/depends/packages/native_libmultiprocess.mk b/depends/packages/native_libmultiprocess.mk
index 7c69e0f0c69..74d22207a07 100644
--- a/depends/packages/native_libmultiprocess.mk
+++ b/depends/packages/native_libmultiprocess.mk
@@ -1,8 +1,8 @@
 package=native_libmultiprocess
-$(package)_version=abe254b9734f2e2b220d1456de195532d6e6ac1e
+$(package)_version=07c917f7ca910d66abc6d3873162fc9061704074
 $(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
 $(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=85777073259fdc75d24ac5777a19991ec1156c5f12db50b252b861c95dcb4f46
+$(package)_sha256_hash=ac9db311e3b22aac3c7b7b7b3f6b7fee5cf3043ebb3c3bf412049e8b17166de8
 $(package)_dependencies=native_capnp
 
 define $(package)_config_cmds
diff --git a/src/ipc/capnp/common-types.h b/src/ipc/capnp/common-types.h
index 51af6a5f0aa..934dae5faf3 100644
--- a/src/ipc/capnp/common-types.h
+++ b/src/ipc/capnp/common-types.h
@@ -14,6 +14,19 @@
 
 #include <cstddef>
 #include <mp/proxy-types.h>
+#include <mp/type-chrono.h>
+#include <mp/type-context.h>
+#include <mp/type-data.h>
+#include <mp/type-decay.h>
+#include <mp/type-interface.h>
+#include <mp/type-message.h>
+#include <mp/type-number.h>
+#include <mp/type-optional.h>
+#include <mp/type-pointer.h>
+#include <mp/type-string.h>
+#include <mp/type-struct.h>
+#include <mp/type-threadmap.h>
+#include <mp/type-vector.h>
 #include <type_traits>
 #include <utility>
 
@@ -94,26 +107,6 @@ requires ipc::capnp::Deserializable<LocalType>
     return read_dest.construct(::deserialize, wrapper);
 }
 
-//! Overload CustomBuildField and CustomReadField to serialize std::chrono
-//! parameters and return values as numbers.
-template <class Rep, class Period, typename Value, typename Output>
-void CustomBuildField(TypeList<std::chrono::duration<Rep, Period>>, Priority<1>, InvokeContext& invoke_context, Value&& value,
-                      Output&& output)
-{
-    static_assert(std::numeric_limits<decltype(output.get())>::lowest() <= std::numeric_limits<Rep>::lowest(),
-                  "capnp type does not have enough range to hold lowest std::chrono::duration value");
-    static_assert(std::numeric_limits<decltype(output.get())>::max() >= std::numeric_limits<Rep>::max(),
-                  "capnp type does not have enough range to hold highest std::chrono::duration value");
-    output.set(value.count());
-}
-
-template <class Rep, class Period, typename Input, typename ReadDest>
-decltype(auto) CustomReadField(TypeList<std::chrono::duration<Rep, Period>>, Priority<1>, InvokeContext& invoke_context,
-                               Input&& input, ReadDest&& read_dest)
-{
-    return read_dest.construct(input.get());
-}
-
 //! Overload CustomBuildField and CustomReadField to serialize UniValue
 //! parameters and return values as JSON strings.
 template <typename Value, typename Output>
@@ -134,32 +127,6 @@ decltype(auto) CustomReadField(TypeList<UniValue>, Priority<1>, InvokeContext& i
     });
 }
 
-//! Generic ::capnp::Data field builder for any C++ type that can be converted
-//! to a span of bytes, like std::vector<char> or std::array<uint8_t>, or custom
-//! blob types like uint256 or PKHash with data() and size() methods pointing to
-//! bytes.
-//!
-//! Note: it might make sense to move this function into libmultiprocess, since
-//! it is fairly generic. However this would require decreasing its priority so
-//! it can be overridden, which would require more changes inside
-//! libmultiprocess to avoid conflicting with the Priority<1> CustomBuildField
-//! function it already provides for std::vector. Also, it might make sense to
-//! provide a CustomReadField counterpart to this function, which could be
-//! called to read C++ types that can be constructed from spans of bytes from
-//! ::capnp::Data fields. But so far there hasn't been a need for this.
-template <typename LocalType, typename Value, typename Output>
-void CustomBuildField(TypeList<LocalType>, Priority<2>, InvokeContext& invoke_context, Value&& value, Output&& output)
-requires
-    (std::is_same_v<decltype(output.get()), ::capnp::Data::Builder>) &&
-    (std::convertible_to<Value, std::span<const std::byte>> ||
-     std::convertible_to<Value, std::span<const char>> ||
-     std::convertible_to<Value, std::span<const unsigned char>> ||
-     std::convertible_to<Value, std::span<const signed char>>)
-{
-    auto data = std::span{value};
-    auto result = output.init(data.size());
-    memcpy(result.begin(), data.data(), data.size());
-}
 } // namespace mp
 
 #endif // BITCOIN_IPC_CAPNP_COMMON_TYPES_H
diff --git a/src/ipc/capnp/echo-types.h b/src/ipc/capnp/echo-types.h
new file mode 100644
index 00000000000..14970c1adb1
--- /dev/null
+++ b/src/ipc/capnp/echo-types.h
@@ -0,0 +1,12 @@
+// Copyright (c) 2025 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_IPC_CAPNP_ECHO_TYPES_H
+#define BITCOIN_IPC_CAPNP_ECHO_TYPES_H
+
+#include <mp/type-context.h>
+#include <mp/type-decay.h>
+#include <mp/type-string.h>
+
+#endif // BITCOIN_IPC_CAPNP_ECHO_TYPES_H
diff --git a/src/ipc/capnp/echo.capnp b/src/ipc/capnp/echo.capnp
index df36ee0de37..03c40f906e5 100644
--- a/src/ipc/capnp/echo.capnp
+++ b/src/ipc/capnp/echo.capnp
@@ -9,7 +9,7 @@ $Cxx.namespace("ipc::capnp::messages");
 
 using Proxy = import "/mp/proxy.capnp";
 $Proxy.include("interfaces/echo.h");
-$Proxy.include("ipc/capnp/echo.capnp.h");
+$Proxy.includeTypes("ipc/capnp/echo-types.h");
 
 interface Echo $Proxy.wrap("interfaces::Echo") {
     destroy @0 (context :Proxy.Context) -> ();
diff --git a/src/ipc/capnp/protocol.cpp b/src/ipc/capnp/protocol.cpp
index 4b67a5bd1e3..691bdf5f924 100644
--- a/src/ipc/capnp/protocol.cpp
+++ b/src/ipc/capnp/protocol.cpp
@@ -73,7 +73,7 @@ public:
     }
     void addCleanup(std::type_index type, void* iface, std::function<void()> cleanup) override
     {
-        mp::ProxyTypeRegister::types().at(type)(iface).cleanup.emplace_back(std::move(cleanup));
+        mp::ProxyTypeRegister::types().at(type)(iface).cleanup_fns.emplace_back(std::move(cleanup));
     }
     Context& context() override { return m_context; }
     void startLoop(const char* exe_name)
diff --git a/src/test/ipc_test.capnp b/src/test/ipc_test.capnp
index 46cd08b94a2..7fd59cf5882 100644
--- a/src/test/ipc_test.capnp
+++ b/src/test/ipc_test.capnp
@@ -20,4 +20,5 @@ interface FooInterface $Proxy.wrap("FooImplementation") {
     passTransaction @3 (arg :Data) -> (result :Data);
     passVectorChar @4 (arg :Data) -> (result :Data);
     passBlockState @5 (arg :Mining.BlockValidationState) -> (result :Mining.BlockValidationState);
+    passScript @6 (arg :Data) -> (result :Data);
 }
diff --git a/src/test/ipc_test.cpp b/src/test/ipc_test.cpp
index af374349802..d78d6695e7b 100644
--- a/src/test/ipc_test.cpp
+++ b/src/test/ipc_test.cpp
@@ -121,6 +121,10 @@ void IpcPipeTest()
     BOOST_CHECK_EQUAL(bs3.GetRejectReason(), bs4.GetRejectReason());
     BOOST_CHECK_EQUAL(bs3.GetDebugMessage(), bs4.GetDebugMessage());
 
+    auto script1{CScript() << OP_11};
+    auto script2{foo->passScript(script1)};
+    BOOST_CHECK_EQUAL(HexStr(script1), HexStr(script2));
+
     // Test cleanup: disconnect pipe and join thread
     disconnect_client();
     thread.join();
diff --git a/src/test/ipc_test.h b/src/test/ipc_test.h
index 2d215a20f1b..2304d8a4c0d 100644
--- a/src/test/ipc_test.h
+++ b/src/test/ipc_test.h
@@ -6,6 +6,7 @@
 #define BITCOIN_TEST_IPC_TEST_H
 
 #include <primitives/transaction.h>
+#include <script/script.h>
 #include <univalue.h>
 #include <util/fs.h>
 #include <validation.h>
@@ -19,6 +20,7 @@ public:
     CTransactionRef passTransaction(CTransactionRef t) { return t; }
     std::vector<char> passVectorChar(std::vector<char> v) { return v; }
     BlockValidationState passBlockState(BlockValidationState s) { return s; }
+    CScript passScript(CScript s) { return s; }
 };
 
 void IpcPipeTest();