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+#############################
+Upgrading from 1.5.2 to 1.5.3
+#############################
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace these files and directories in your "system" folder with the new
+versions:
+
+- system/database/drivers
+- system/helpers
+- system/libraries/Input.php
+- system/libraries/Loader.php
+- system/libraries/Profiler.php
+- system/libraries/Table.php
+
+.. note:: If you have any custom developed files in these folders please
+ make copies of them first.
+
+Step 2: Update your user guide
+==============================
+
+Please also replace your local copy of the user guide with the new
+version.