diff --git a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicDefinition.java b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicDefinition.java
index 885c2ae..82c2850 100644
--- a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicDefinition.java
+++ b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicDefinition.java
@@ -25,7 +25,7 @@ public XkcdComicDefinition() {
     
     @Override
     public Uri getArchiveUrl() {
-        return Uri.parse("http://xkcd.com/archive/");
+        return Uri.parse("https://xkcd.com/archive/");
     }
 
     @Override
@@ -35,7 +35,7 @@ public String getAuthorLinkText() {
 
     @Override
     public Uri getAuthorLinkUrl() {
-        return Uri.parse("http://store.xkcd.com/");
+        return Uri.parse("https://store.xkcd.com/");
     }
 
     @Override
diff --git a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicInfo.java b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicInfo.java
index 7652d41..d3af011 100644
--- a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicInfo.java
+++ b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicInfo.java
@@ -48,7 +48,7 @@ public String getTitle() {
 
     @Override
     public String getUrl() {
-        return "http://xkcd.com/"+getId()+"/";
+        return "https://xkcd.com/"+getId()+"/";
     }
 
     @Override
diff --git a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicProvider.java b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicProvider.java
index bceae06..7bbe83e 100644
--- a/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicProvider.java
+++ b/xkcdViewer/src/main/java/net/bytten/xkcdviewer/XkcdComicProvider.java
@@ -24,7 +24,7 @@ public class XkcdComicProvider implements IComicProvider {
     private static final Pattern archiveItemPattern = Pattern.compile(
             // group(1): comic number;   group(2): date;   group(3): title
             "\\s*<a href=\"/(\\d+)/\" title=\"(\\d+-\\d+-\\d+)\">([^<]+)</a><br/>\\s*");
-    private static final String ARCHIVE_URL = "http://www.xkcd.com/archive/";
+    private static final String ARCHIVE_URL = "https://www.xkcd.com/archive/";
     
     private XkcdComicDefinition def;
     
@@ -43,13 +43,13 @@ public Uri comicDataUrlForUrl(Uri url) {
 
     @Override
     public Uri createComicUrl(String comicId) {
-        return Uri.parse("http://xkcd.com/"+comicId+"/info.0.json");
+        return Uri.parse("https://xkcd.com/"+comicId+"/info.0.json");
     }
 
     @Override
     public IComicInfo fetchComicInfo(Uri url) throws Exception {
         // Uses xkcd's JSON interface
-        //      (http://xkcd.com/json.html) 
+        //      (https://xkcd.com/json.html) 
         String text = Utility.blockingReadUri(url);
         JSONObject obj = (JSONObject)new JSONTokener(text).nextValue();
         Log.d("json", obj.names().toString());
@@ -91,7 +91,7 @@ public Uri fetchRandomComicUrl() throws Exception {
 
     @Override
     public Uri getFinalComicUrl() {
-        return Uri.parse("http://xkcd.com/info.0.json");
+        return Uri.parse("https://xkcd.com/info.0.json");
     }
 
     @Override
diff --git a/xkcdViewer/src/main/res/values/strings.xml b/xkcdViewer/src/main/res/values/strings.xml
index 5d5cdb9..03974f8 100644
--- a/xkcdViewer/src/main/res/values/strings.xml
+++ b/xkcdViewer/src/main/res/values/strings.xml
@@ -9,7 +9,7 @@
     xkcdViewer v%s. Application for viewing xkcd comics with hover text.\n\n
     xkcdViewer Copyright (C) 2009-2017, Tom Coxon, Tyler Breisacher, David
     McCullough, Kristian Lundkvist.\n\n
-    xkcd is Copyright (C) 2006 - 2017, Randall Munroe (http://xkcd.com)\n\n
+    xkcd is Copyright (C) 2006 - 2017, Randall Munroe (https://xkcd.com)\n\n
     Contains some menu icons from www.androidicons.com, licensed under a
     Creative Commons Attribution - Share Alike license.\n\n
     Application icon kindly donated by Johan Larsson.\n\n