diff --git a/README b/README
index e77e619..5b97427 100644
--- a/README
+++ b/README
@@ -1 +1 @@
-See http://sourceforge.net/projects/extremetuxracer/
+See https://sourceforge.net/projects/extremetuxracer/
diff --git a/configure.ac b/configure.ac
index 3d8758d..ec899d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@
 
 AC_PREREQ([2.64])
 AC_INIT([Extreme Tux Racer], [0.7.99], [https://sourceforge.net/projects/extremetuxracer],
-        [etr], [http://sourceforge.net/projects/extremetuxracer])
+        [etr], [https://sourceforge.net/projects/extremetuxracer])
 AC_CONFIG_SRCDIR([src/gui.cpp])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([etr_config.h])
diff --git a/resources/etr.appdata.xml b/resources/etr.appdata.xml
index b04e047..21e1c3e 100644
--- a/resources/etr.appdata.xml
+++ b/resources/etr.appdata.xml
@@ -26,6 +26,6 @@
             <image>https://a.fsdn.com/con/app/proj/extremetuxracer/screenshots/ETR2.png</image>
         </screenshot>
     </screenshots>
-    <url type="homepage">http://extremetuxracer.sourceforge.net/</url>
+    <url type="homepage">https://extremetuxracer.sourceforge.net/</url>
     <update_contact>https://sourceforge.net/p/extremetuxracer/discussion/</update_contact>
 </component>