diff --git a/kdecoration/CMakeLists.txt b/kdecoration/CMakeLists.txt
index e79d7288..42e0fd15 100644
--- a/kdecoration/CMakeLists.txt
+++ b/kdecoration/CMakeLists.txt
@@ -7,7 +7,7 @@ find_package(Qt5 CONFIG REQUIRED COMPONENTS DBus)
 find_package(XCB COMPONENTS XCB)
 set_package_properties(XCB PROPERTIES
   DESCRIPTION "X protocol C-language Binding"
-  URL "http://xcb.freedesktop.org"
+  URL "https://xcb.freedesktop.org"
   TYPE OPTIONAL
   PURPOSE "Required to pass style properties to native Windows on X11 Platform"
 )
diff --git a/kstyle/CMakeLists.txt b/kstyle/CMakeLists.txt
index 2b061acf..ff16a72b 100644
--- a/kstyle/CMakeLists.txt
+++ b/kstyle/CMakeLists.txt
@@ -19,7 +19,7 @@ if(BREEZE_USE_KDE4)
     find_package(PkgConfig REQUIRED)
     pkg_check_modules(XCB xcb x11-xcb)
     add_feature_info("x11-xcb" XCB_FOUND "Required to pass style properties to native Windows on X11 Platform")
-    set_feature_info("x11-xcb" "Required to pass style properties to native Windows on X11 Platform" "http://xcb.freedesktop.org")
+    set_feature_info("x11-xcb" "Required to pass style properties to native Windows on X11 Platform" "https://xcb.freedesktop.org")
     set(BREEZE_HAVE_X11 ${XCB_FOUND})
   else()
     set(BREEZE_HAVE_X11 FALSE)
@@ -56,7 +56,7 @@ else()
   find_package(XCB COMPONENTS XCB)
   set_package_properties(XCB PROPERTIES
       DESCRIPTION "X protocol C-language Binding"
-      URL "http://xcb.freedesktop.org"
+      URL "https://xcb.freedesktop.org"
       TYPE OPTIONAL
       PURPOSE "Required to pass style properties to native Windows on X11 Platform"
   )
@@ -171,7 +171,7 @@ else()
   endif()
 
   if (WIN32)
-    # As stated in http://msdn.microsoft.com/en-us/library/4hwaceh6.aspx M_PI only gets defined
+    # As stated in https://docs.microsoft.com/en-us/cpp/c-runtime-library/math-constants M_PI only gets defined
     # when if _USE_MATH_DEFINES is defined
     target_compile_definitions(breeze PRIVATE _USE_MATH_DEFINES _BSD_SOURCE)
   endif()
diff --git a/kstyle/breezeshadowhelper.cpp b/kstyle/breezeshadowhelper.cpp
index 3ffdea4a..19249011 100644
--- a/kstyle/breezeshadowhelper.cpp
+++ b/kstyle/breezeshadowhelper.cpp
@@ -397,7 +397,7 @@ namespace Breeze
 
         /**
         shadow atom and property specification available at
-        http://community.kde.org/KWin/Shadow
+        https://community.kde.org/KWin/Shadow
         */
 
         // create atom
diff --git a/kstyle/breezeshadowhelper.h b/kstyle/breezeshadowhelper.h
index 4d971e0c..f85612c5 100644
--- a/kstyle/breezeshadowhelper.h
+++ b/kstyle/breezeshadowhelper.h
@@ -166,7 +166,7 @@ namespace Breeze
         //* install shadow X11 property on given widget
         /**
         shadow atom and property specification available at
-        http://community.kde.org/KWin/Shadow
+        https://community.kde.org/KWin/Shadow
         */
         bool installX11Shadows( QWidget* );
 
diff --git a/lookandfeel.dark/metadata.desktop b/lookandfeel.dark/metadata.desktop
index b252128e..57225527 100644
--- a/lookandfeel.dark/metadata.desktop
+++ b/lookandfeel.dark/metadata.desktop
@@ -84,6 +84,6 @@ X-KDE-PluginInfo-Email=plasma-devel@kde.org
 X-KDE-PluginInfo-License=GPL-2.0+
 X-KDE-PluginInfo-Name=org.kde.breezedark.desktop
 X-KDE-PluginInfo-Version=2.0
-X-KDE-PluginInfo-Website=http://www.kde.org
+X-KDE-PluginInfo-Website=https://www.kde.org
 X-Plasma-MainScript=defaults
 X-KDE-PluginInfo-License=GPLv2+