diff --git a/core/INSTALL.txt b/core/INSTALL.txt
index c839761..74ceed9 100644
--- a/core/INSTALL.txt
+++ b/core/INSTALL.txt
@@ -353,7 +353,7 @@ Never edit Drupal's core modules and themes; instead, use the hooks available in
 the Drupal API. To modify the behavior of Drupal, develop a module as described
 at https://www.drupal.org/developing/modules. To modify the look of Drupal,
 create a subtheme as described at https://www.drupal.org/node/2165673, or a
-completely new theme as described at https://www.drupal.org/documentation/theme
+completely new theme as described at https://www.drupal.org/docs/8/theming
 
 MULTISITE CONFIGURATION
 -----------------------
diff --git a/core/lib/Drupal/Core/Render/theme.api.php b/core/lib/Drupal/Core/Render/theme.api.php
index b9d9e7b..f9d3684 100644
--- a/core/lib/Drupal/Core/Render/theme.api.php
+++ b/core/lib/Drupal/Core/Render/theme.api.php
@@ -223,7 +223,7 @@
  * same, which gives users fewer user interface patterns to learn.
  *
  * For further information on the Theme and Render APIs, see:
- * - https://www.drupal.org/documentation/theme
+ * - https://www.drupal.org/docs/8/theming
  * - https://www.drupal.org/developing/api/8/render
  * - https://www.drupal.org/node/722174
  * - https://www.drupal.org/node/933976
diff --git a/core/themes/classy/README.txt b/core/themes/classy/README.txt
index e3b04df..4884777 100644
--- a/core/themes/classy/README.txt
+++ b/core/themes/classy/README.txt
@@ -8,8 +8,8 @@ To use Classy as your base theme, set the 'base theme' in your theme's .info.yml
 file to "classy":
   base theme: classy
 
-See https://www.drupal.org/theme-guide/8/classy for more information on using
-the Classy theme.
+See https://www.drupal.org/docs/8/theming-drupal-8/using-classy-as-a-base-theme
+for more information on using the Classy theme.
 
 ABOUT DRUPAL THEMING
 --------------------