diff --git a/admin/tool/log/upgrade.txt b/admin/tool/log/upgrade.txt
index abaf3e27327..cf9126a7d7b 100644
--- a/admin/tool/log/upgrade.txt
+++ b/admin/tool/log/upgrade.txt
@@ -11,5 +11,5 @@ information provided here is intended especially for developers.
 
 === 3.6 ===
 
-* The legacy log store is in its first stage of deprecation and is due for removal in Moodle 4.0. Please use one of
+* The legacy log store is in its first stage of deprecation and is due for removal in Moodle 3.10. Please use one of
   the other log stores such as "standard" and "database".
diff --git a/cache/upgrade.txt b/cache/upgrade.txt
index 756307784c6..d92a97e4952 100644
--- a/cache/upgrade.txt
+++ b/cache/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /cache/stores/* - cache store plugins.
 Information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 * The function supports_recursion() from the lock_factory interface has been deprecated including the related implementations.
 * The function extend_lock() from the lock_factory interface has been deprecated without replacement including the related
   implementations.
diff --git a/calendar/upgrade.txt b/calendar/upgrade.txt
index 5e9f6414a0c..35fda4daa05 100644
--- a/calendar/upgrade.txt
+++ b/calendar/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /calendar/* ,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 * The core_calendar\local\event\value_objects\times_interface class now has new method get_usermidnight_time() which
   returns the user midnight time for a given event.
 
diff --git a/course/upgrade.txt b/course/upgrade.txt
index 16e84d35e04..4af9f853a00 100644
--- a/course/upgrade.txt
+++ b/course/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /course/*,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 
 * The function make_categories_options() has now been deprecated. Please use \core_course_category::make_categories_list() instead.
 
diff --git a/grade/grading/form/upgrade.txt b/grade/grading/form/upgrade.txt
index 7a8be2d09a3..d3621a9e471 100644
--- a/grade/grading/form/upgrade.txt
+++ b/grade/grading/form/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /grade/grading/form/* - Advanced grading methods
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 
 * Removed gradingform_provider.
 * Removed the following deprecated functions:
diff --git a/h5p/upgrade.txt b/h5p/upgrade.txt
index 59eb0cba4dc..ee5271c44a9 100644
--- a/h5p/upgrade.txt
+++ b/h5p/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 * Added a new cache for h5p_library_files (MDL-69207)
 
 === 3.9 ===
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index fef4e504ee8..520f52734a7 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 * Added function setScrollable in core/modal. This function can be used to set the modal's body to be scrollable or not
   when the modal's height exceeds the browser's height. This is also supported in core/modal_factory through the
   'scrollable' config parameter which can be set to either true or false. If not explicitly defined, the default value
diff --git a/question/behaviour/upgrade.txt b/question/behaviour/upgrade.txt
index e29055eba61..5c5e7be3ec4 100644
--- a/question/behaviour/upgrade.txt
+++ b/question/behaviour/upgrade.txt
@@ -1,6 +1,6 @@
 This files describes API changes for question behaviour plugins.
 
-=== 4.0 ===
+=== 3.10 ===
 
 1) The slot parameter of method M.core_question_engine.init_submit_button now removed.
    The method will get the unique id by using the 'Check' button element.
diff --git a/search/upgrade.txt b/search/upgrade.txt
index d56cdd974aa..d7037ad1856 100644
--- a/search/upgrade.txt
+++ b/search/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /search/*,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
 
 * Search indexing now supports sending multiple documents to the server in a batch. This is implemented
   for the Solr search engine, where it significantly increases performance. For this to work, engines
diff --git a/theme/upgrade.txt b/theme/upgrade.txt
index e0af22610d7..a67d8a8cf0c 100644
--- a/theme/upgrade.txt
+++ b/theme/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /theme/* themes,
 information provided here is intended especially for theme designer.
 
-=== 4.0 ===
+=== 3.10 ===
 * The Bootstrap legacy css utilities from Bootstrap 2 and 4alpha have been removed.
 The syntax for the new Bootstrap 4.5 utility classes is {property}{sides}-{breakpoint}-{size} for sm, md, lg, and xl.
 The size values are: