diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@
 project(okular VERSION 1.6.${KDE_APPLICATIONS_VERSION_MICRO})
 
 set(QT_REQUIRED_VERSION "5.8.0")
-set(KF5_REQUIRED_VERSION "5.44.0")
+set(KF5_REQUIRED_VERSION "5.56.0")
 
 find_package(ECM 5.33.0 CONFIG REQUIRED)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH})
diff --git a/mobile/app/package/contents/ui/TableOfContents.qml b/mobile/app/package/contents/ui/TableOfContents.qml
--- a/mobile/app/package/contents/ui/TableOfContents.qml
+++ b/mobile/app/package/contents/ui/TableOfContents.qml
@@ -20,7 +20,7 @@
 import QtQuick 2.1
 import QtQuick.Controls 1.3
 import QtQuick.Controls 2.0 as QQC2
-import org.kde.kirigami 2.0 as Kirigami
+import org.kde.kirigami 2.7 as Kirigami
 
 Kirigami.Page {
     id: root
@@ -35,9 +35,21 @@
         id: toolBarContent
         width: root.width
         height: searchField.height
-        QQC2.TextField {
+        Kirigami.ActionTextField {
             id: searchField
             anchors.centerIn: parent
+            rightActions: [
+                Kirigami.Action {
+                    iconName: "edit-clear"
+                    visible: searchField.text != ""
+                    onTriggered: {
+                        searchField.text = ""
+                        searchField.accepted()
+                    }
+                }
+            ]
+            focusSequence: "Ctrl+F"
+            placeholderText: i18n("Search...")
         }
     }
     ScrollView {
diff --git a/mobile/app/package/contents/ui/Thumbnails.qml b/mobile/app/package/contents/ui/Thumbnails.qml
--- a/mobile/app/package/contents/ui/Thumbnails.qml
+++ b/mobile/app/package/contents/ui/Thumbnails.qml
@@ -19,7 +19,7 @@
 
 import QtQuick 2.1
 import QtQuick.Controls 2.0
-import org.kde.kirigami 2.0 as Kirigami
+import org.kde.kirigami 2.7 as Kirigami
 
 ThumbnailsBase {
     id: root
@@ -29,10 +29,22 @@
         id: toolBarContent
         width: root.width
         height: searchField.height
-        TextField {
+        Kirigami.ActionTextField {
             id: searchField
-            enabled: documentItem ? documentItem.supportsSearching : false
             anchors.centerIn: parent
+            rightActions: [
+                Kirigami.Action {
+                    iconName: "edit-clear"
+                    visible: searchField.text != ""
+                    onTriggered: {
+                        searchField.text = ""
+                        searchField.accepted()
+                    }
+                }
+            ]
+            enabled: documentItem ? documentItem.supportsSearching : false
+            placeholderText: documentItem && documentItem.supportsSearching ? i18n("Search...") : i18n("This document isn't searchable.")
+            focusSequence: "Ctrl+F"
             onTextChanged: {
                 if (text.length > 2) {
                     documentItem.searchText(text);