diff --git a/cmake/FindPerlModules.cmake b/cmake/FindPerlModules.cmake
--- a/cmake/FindPerlModules.cmake
+++ b/cmake/FindPerlModules.cmake
@@ -84,6 +84,6 @@
 
 include(FeatureSummary)
 set_package_properties(PerlModules PROPERTIES
-    URL "http://www.cpan.org"
+    URL "https://www.cpan.org"
 )
 
diff --git a/common/en/kde-default.css b/common/en/kde-default.css
--- a/common/en/kde-default.css
+++ b/common/en/kde-default.css
@@ -23,7 +23,7 @@
    Important note: these setting may be overridden by localised CSS.  Do not 
    add here any localization-sensitive style declarations.
 
-   Any updates should be validated, e.g. http://jigsaw.w3.org/css-validator/ */
+   Any updates should be validated, e.g. https://jigsaw.w3.org/css-validator/ */
 
 /* Note: "should be inherit" means that in a proper browser inherit should work.
    Somehow Netscape manages to interpret "inherit" as bright green. 
diff --git a/docs/meinproc5/man-meinproc5.1.docbook b/docs/meinproc5/man-meinproc5.1.docbook
--- a/docs/meinproc5/man-meinproc5.1.docbook
+++ b/docs/meinproc5/man-meinproc5.1.docbook
@@ -216,7 +216,7 @@
 
 <refsect1>
 <title>Bugs</title>
-<para>Please use <ulink url="http://bugs.kde.org">KDE's bugtracker</ulink> to report bugs.</para>
+<para>Please use <ulink url="https://bugs.kde.org">KDE's bugtracker</ulink> to report bugs.</para>
 </refsect1>
 
 </refentry>
diff --git a/docs/qt5options/man-qt5options.7.docbook b/docs/qt5options/man-qt5options.7.docbook
--- a/docs/qt5options/man-qt5options.7.docbook
+++ b/docs/qt5options/man-qt5options.7.docbook
@@ -26,13 +26,13 @@
 <refsynopsisdiv>
 <cmdsynopsis>
 <command><replaceable>Qt application</replaceable></command>
-<!--http://doc.qt.io/qt-5/qapplication.html#QApplication-->
+<!--https://doc.qt.io/qt-5/qapplication.html#QApplication-->
 <arg choice="opt"><option>-style=</option> <replaceable>style</replaceable> / <option>-style</option> <replaceable>style</replaceable></arg>
 <arg choice="opt"><option>-stylesheet=</option> <replaceable>stylesheet</replaceable> / <option>-stylesheet</option> <replaceable>stylesheet</replaceable></arg>
 <arg choice="opt"><option>-widgetcount</option></arg>
 <arg choice="opt"><option>-reverse</option></arg>
 <arg choice="opt"><option>-qmljsdebugger=</option> <replaceable>port</replaceable></arg>
-<!--http://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication-->
+<!--https://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication-->
 <arg choice="opt"><option>-platform</option> <replaceable>platformName[:options]</replaceable></arg>
 <arg choice="opt"><option>-platformpluginpath</option> <replaceable>path</replaceable></arg>
 <arg choice="opt"><option>-platformtheme</option> <replaceable>platformTheme</replaceable></arg>
@@ -46,7 +46,7 @@
 <arg choice="opt"><option>-geometry</option> <replaceable>geometry</replaceable></arg>
 <arg choice="opt"><option>-dialogs=</option> <replaceable>[xp|none]</replaceable></arg>
 <arg choice="opt"><option>-fontengine=</option> <replaceable>freetype</replaceable></arg>
-<!--http://doc.qt.io/qt-5/qcommandlineparser.html -->
+<!--https://doc.qt.io/qt-5/qcommandlineparser.html -->
 <arg choice="opt"><option>-h, --help and -? on Windows</option></arg>
 <arg choice="opt"><option>-v --version</option></arg>
 </cmdsynopsis>
@@ -59,7 +59,7 @@
 <para>The following options apply to all &Qt; applications:</para>
 
 <variablelist>
-<!--http://doc.qt.io/qt-5/qapplication.html#QApplication-->
+<!--https://doc.qt.io/qt-5/qapplication.html#QApplication-->
 <varlistentry>
 <term>
 <option>-style=</option> <replaceable>style</replaceable> / <option>-style</option> <replaceable>style</replaceable>
@@ -109,7 +109,7 @@
 where block is optional and will make the application wait until a debugger connects to it.
 </para></listitem>
 </varlistentry>
-<!--http://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication-->
+<!--https://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication-->
 <varlistentry>
 <term>
 <option>-platform</option> <replaceable>platformName[:options]</replaceable>
@@ -218,7 +218,7 @@
 </para></listitem>
 </varlistentry>
 
-<!--http://doc.qt.io/qt-5/qcommandlineparser.html -->
+<!--https://doc.qt.io/qt-5/qcommandlineparser.html -->
 <varlistentry>
 <term>
 <option>-h, --help and -? on Windows</option>
@@ -252,9 +252,9 @@
 <title>Authors</title>
 <para>Man page originally written by &Lauri.Watts; &Lauri.Watts.mail;</para>
 <para>Updated to Frameworks 5 by &Burkhard.Lueck; &Burkhard.Lueck.mail;</para>
-<para>The infos for this man page are from <ulink url="http://doc.qt.io/qt-5/qapplication.html#QApplication">QApplication documentation</ulink>,
-<ulink url="http://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication">QGuiApplication documentation</ulink>
-and <ulink url="http://doc.qt.io/qt-5/qcommandlineparser.html">QCommandLineParser documentation</ulink>.</para>
+<para>The infos for this man page are from <ulink url="https://doc.qt.io/qt-5/qapplication.html#QApplication">QApplication documentation</ulink>,
+<ulink url="https://doc.qt.io/qt-5/qguiapplication.html#QGuiApplication">QGuiApplication documentation</ulink>
+and <ulink url="https://doc.qt.io/qt-5/qcommandlineparser.html">QCommandLineParser documentation</ulink>.</para>
 </refsect1>
 
 </refentry>
diff --git a/src/customization/en/entities/install-compile.docbook b/src/customization/en/entities/install-compile.docbook
--- a/src/customization/en/entities/install-compile.docbook
+++ b/src/customization/en/entities/install-compile.docbook
@@ -1,8 +1,8 @@
 <!-- Entity is deprecated and should be removed in Frameworks 6-->
 
 <para>For information on how to compile and install &kde; 
-applications visit the <ulink url="http://techbase.kde.org/">
-&kde; Techbase</ulink></para>
+applications visit the <ulink url="https://community.kde.org/Guidelines_and_HOWTOs/Build_from_source">
+&kde; Community wiki</ulink>.</para>
 
 <para>Since &kde; uses <command>cmake</command> you should have no 
 trouble compiling it. Should you run into problems please report them to the 
diff --git a/src/customization/en/entities/install-intro.docbook b/src/customization/en/entities/install-intro.docbook
--- a/src/customization/en/entities/install-intro.docbook
+++ b/src/customization/en/entities/install-intro.docbook
@@ -4,5 +4,5 @@
  -->
 <para>&kappname; is part of the &kde; project &kde-http;.</para>
 
-<para>&kappname; can be found on the <ulink url="http://download.kde.org/">
+<para>&kappname; can be found on the <ulink url="https://download.kde.org/">
 download site</ulink> of the &kde; project.</para>
diff --git a/src/customization/en/entities/update-doc.docbook b/src/customization/en/entities/update-doc.docbook
--- a/src/customization/en/entities/update-doc.docbook
+++ b/src/customization/en/entities/update-doc.docbook
@@ -1,4 +1,4 @@
 <!-- Entity is deprecated and should be removed in Frameworks 6-->
 <para>This document may have been updated since your installation.
 You can find the latest version at <ulink
-url="http://docs.kde.org/">http://docs.kde.org/</ulink>.</para>
+url="https://docs.kde.org/">https://docs.kde.org/</ulink>.</para>
diff --git a/src/template.docbook b/src/template.docbook
--- a/src/template.docbook
+++ b/src/template.docbook
@@ -508,7 +508,7 @@
 or the ChangeLog file, or ... -->
 <para>
 You can find a list of changes at <ulink
-url="http://apps.kde.org/kapp">http://apps.kde.org/kapp</ulink>.
+url="https://apps.kde.org/kapp">https://apps.kde.org/kapp</ulink>.
 </para>
 </sect1>