diff --git a/CMakeLists.txt b/CMakeLists.txt
index efc857d..14fc9c2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,7 +36,7 @@ if(Qt5_FOUND AND NOT TARGET Qt::Core)
     endforeach()
 endif()
 
-find_package(KF${QT_VERSION_MAJOR}SyntaxHighlighting REQUIRED)
+find_package(KF${QT_VERSION_MAJOR}SyntaxHighlighting 5.56 REQUIRED)
 set_package_properties(KF${QT_VERSION_MAJOR}SyntaxHighlighting PROPERTIES
     URL "https://community.kde.org/Frameworks"
     DESCRIPTION "Syntax Highlighting framework for Qt${QT_VERSION_MAJOR}"
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 4114b46..9af2420 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -16,7 +16,6 @@
 add_library(syntaxtextedit "")
 target_sources(syntaxtextedit
     PRIVATE
-        kf_version.h
         syntaxhighlighter.h
         syntaxhighlighter.cpp
         syntaxtextedit.h
diff --git a/lib/kf_version.h b/lib/kf_version.h
deleted file mode 100644
index 2047f4b..0000000
--- a/lib/kf_version.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* This file is part of QTextPad.
- *
- * QTextPad is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * QTextPad is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with QTextPad.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef QTEXTPAD_KF_VERSION_H
-#define QTEXTPAD_KF_VERSION_H
-
-#include <ksyntaxhighlighting_version.h>
-
-#if defined(KSYNTAXHIGHLIGHTING_VERSION)
-#   if KSYNTAXHIGHLIGHTING_VERSION >= ((5<<16)|(56<<8)|(0))
-#       define SUPPORT_DEFINITION_DOWNLOADER 1
-#   endif
-#elif defined(SyntaxHighlighting_VERSION)
-#   if SyntaxHighlighting_VERSION >= ((5<<16)|(56<<8)|(0))
-#       define SUPPORT_DEFINITION_DOWNLOADER 1
-#   endif
-#   define KSYNTAXHIGHLIGHTING_VERSION_STRING SyntaxHighlighting_VERSION_STRING
-#else
-#   error Unsupported ksyntaxhighlighting_version.h header format
-#endif
-
-#endif  // QTEXTPAD_KF_VERSION_H
diff --git a/src/aboutdialog.cpp b/src/aboutdialog.cpp
index 126c12d..2a28d8b 100644
--- a/src/aboutdialog.cpp
+++ b/src/aboutdialog.cpp
@@ -22,10 +22,10 @@
 #include <QDialogButtonBox>
 #include <QGridLayout>
 #include <QMessageBox>
+#include <ksyntaxhighlighting_version.h>
 
 #include "appversion.h"
 #include "charsets.h"
-#include "kf_version.h"
 
 AboutDialog::AboutDialog(QWidget *parent)
     : QDialog(parent)
@@ -78,7 +78,13 @@ AboutDialog::AboutDialog(QWidget *parent)
         "<li>Oxygen Icons</li>"
         "</ul>")
         .arg(QString::fromLatin1(qVersion()),
+#if defined(KSYNTAXHIGHLIGHTING_VERSION)
              QStringLiteral(KSYNTAXHIGHLIGHTING_VERSION_STRING),
+#elif defined(SyntaxHighlighting_VERSION)
+             QStringLiteral(SyntaxHighlighting_VERSION),
+#else
+#   error Unsupported <ksyntaxhighlighting_version.h> header format
+#endif
              TextCodec::icuVersion())
         );
     libVersions->setMargin(10);
diff --git a/src/definitiondownload.cpp b/src/definitiondownload.cpp
index 63a143c..94128c9 100644
--- a/src/definitiondownload.cpp
+++ b/src/definitiondownload.cpp
@@ -16,8 +16,6 @@
 
 #include "definitiondownload.h"
 
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
-
 #include <QPlainTextEdit>
 #include <QDialogButtonBox>
 #include <QPushButton>
@@ -105,5 +103,3 @@ void DefinitionDownloadDialog::closeEvent(QCloseEvent *e)
     if (!m_buttonBox->button(QDialogButtonBox::Close)->isEnabled())
         e->ignore();
 }
-
-#endif // SUPPORT_DEFINITION_DOWNLOADER
diff --git a/src/definitiondownload.h b/src/definitiondownload.h
index 0bbb875..97e0e72 100644
--- a/src/definitiondownload.h
+++ b/src/definitiondownload.h
@@ -17,10 +17,6 @@
 #ifndef QTEXTPAD_DEFINITIONDOWNLOAD_H
 #define QTEXTPAD_DEFINITIONDOWNLOAD_H
 
-#include "kf_version.h"
-
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
-
 #include <QDialog>
 #include <QElapsedTimer>
 
@@ -53,6 +49,4 @@ public Q_SLOTS:
     QElapsedTimer m_timer;
 };
 
-#endif // SUPPORT_DEFINITION_DOWNLOADER
-
 #endif // QTEXTPAD_DEFINITIONDOWNLOAD_H
diff --git a/src/main.cpp b/src/main.cpp
index f811319..6f9bbf3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -25,12 +25,9 @@
 #include <QStyle>
 #endif
 
-#include "kf_version.h"
 #include <KSyntaxHighlighting/Repository>
 #include <KSyntaxHighlighting/Definition>
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
 #include <KSyntaxHighlighting/DefinitionDownloader>
-#endif
 
 #include "qtextpadwindow.h"
 #include "syntaxtextedit.h"
@@ -133,15 +130,12 @@ int main(int argc, char *argv[])
     parser.addOption(encodingOption);
     parser.addOption(syntaxOption);
 
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
     const QCommandLineOption updateOption(QStringList{QStringLiteral("update-definitions")},
             QCoreApplication::translate("main", "Download updated syntax definitions from the internet and exit."));
     parser.addOption(updateOption);
-#endif
 
     parser.process(app);
 
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
     if (parser.isSet(updateOption)) {
         // Handle this before any GUI objects are created
         KSyntaxHighlighting::Repository syntaxRepo;
@@ -155,7 +149,6 @@ int main(int argc, char *argv[])
         downloader.start();
         return QApplication::exec();
     }
-#endif
 
     setDefaultIconTheme();
 
diff --git a/src/qtextpadwindow.cpp b/src/qtextpadwindow.cpp
index ac98c81..438fc3c 100644
--- a/src/qtextpadwindow.cpp
+++ b/src/qtextpadwindow.cpp
@@ -1640,7 +1640,6 @@ void QTextPadWindow::populateSyntaxMenu()
         connect(item, &QAction::triggered, this, [this, def] { setSyntax(def); });
     }
 
-#ifdef SUPPORT_DEFINITION_DOWNLOADER
     (void) m_syntaxMenu->addSeparator();
     auto updateAction = m_syntaxMenu->addAction(tr("Update Definitions"));
     connect(updateAction, &QAction::triggered, this, [this] {
@@ -1650,7 +1649,6 @@ void QTextPadWindow::populateSyntaxMenu()
         downloadDialog->raise();
         downloadDialog->activateWindow();
     });
-#endif
 }
 
 void QTextPadWindow::populateThemeMenu()