diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1880f952..cb0d25bc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ set(CMAKE_AUTOMOC ON)
 include( GNUInstallDirs )
 include( VersionInfo )
 
-find_package(LibDigiDocpp 4.0.0 REQUIRED)
+find_package(LibDigiDocpp 4.1.0 REQUIRED)
 find_package( LDAP REQUIRED )
 find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
 find_package(Qt${QT_VERSION_MAJOR} 5.12.0 REQUIRED COMPONENTS Core Widgets Network PrintSupport Svg LinguistTools)
diff --git a/client/DigiDoc.cpp b/client/DigiDoc.cpp
index bf5f00fb..9b12e0d3 100644
--- a/client/DigiDoc.cpp
+++ b/client/DigiDoc.cpp
@@ -21,6 +21,8 @@
 
 #include "Application.h"
 #include "CheckConnection.h"
+#include "Common.h"
+#include "QPCSC.h"
 #include "QSigner.h"
 #include "SslCertificate.h"
 #include "TokenData.h"
@@ -367,7 +369,7 @@ bool SDocumentModel::removeRow(int row)
 
 	try
 	{
-		doc->b->removeDataFile(row);
+		doc->b->removeDataFile(unsigned(row));
 		doc->modified = true;
 		emit removed(row);
 		return true;
@@ -688,6 +690,11 @@ bool DigiDoc::sign(const QString &city, const QString &state, const QString &zip
 			roles.push_back(to(role));
 		signer->setSignerRoles(roles);
 		signer->setProfile("time-stamp");
+		signer->setUserAgent(QStringLiteral("%1/%2 (%3) Devices: %4").arg(
+			 QCoreApplication::applicationName(),
+			 QCoreApplication::applicationVersion(),
+			 Common::applicationOs(),
+			 Common::drivers().join(',')).toUtf8().constData());
 		qApp->waitForTSL( fileName() );
 		digidoc::Signature *s = b->sign(signer);
 		return modified = waitFor([&] {