diff --git a/CHANGES.md b/CHANGES.md
index c734f071bc9f439da2c7d0ec991847bba51ad2fe..3906ca9771311de487131b219a6746ab8ab4102d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,6 +6,7 @@ Changes
 
 ### Unreleased
 
+* 2020-09-23 - Updated referenced Bootstrap version to latest in upstream used version 4.5.
 * 2020-09-18 - Removed fix that bullet points are cut off because it is fixed in upstream Boost now.
                NOTE: requires minimum Moodle version Moodle 3.9.2 (2020061502)
 * 2020-09-03 - Adjusted columns2.mustache template due to upstream changes in theme Boost.
diff --git a/README.md b/README.md
index f24b5cece31d563af2f536ad58d75bbc8c186533..adcd9c3ea9477141d159f07818b41a08db45fbd9 100644
--- a/README.md
+++ b/README.md
@@ -331,7 +331,7 @@ For this reason, with this setting you can decide that the help texts should be
 ##### Change breakpoint
 
 In theme Boost, the right block column will break down even on devices with a width up to 1200 pixels (widescreen resolution of the iPad is 1024 pixels, for example).
-This is because the breakpoint is set to [media-breakpoint-down(lg)](https://getbootstrap.com/docs/4.0/layout/overview/#responsive-breakpoints").
+This is because the breakpoint is set to [media-breakpoint-down(lg)](https://getbootstrap.com/docs/4.5/layout/overview/#responsive-breakpoints").
 
 If you think there is enough space to show the content plus the blocks column side by side on a screen width of 992 pixels and up, then enable this setting. It will change the breakpoint to media-breakpoint-down(md). This will break the blocks column only on screens with widths of less than 992 pixels.
 
diff --git a/lang/en/theme_boost_campus.php b/lang/en/theme_boost_campus.php
index fc33a89afb2ca1f56b2f817362a178fc537c53f9..448caf19f95b7fe5b7205256e5b26124559bdd79 100644
--- a/lang/en/theme_boost_campus.php
+++ b/lang/en/theme_boost_campus.php
@@ -213,7 +213,7 @@ For this reason, with this setting you can decide that the help texts should be
 $string['breakpointheadingsetting'] = 'Breakpoint';
 $string['breakpointsetting'] = 'Change breakpoint';
 $string['breakpointsetting_desc'] = 'In theme Boost, the right block column will break down even on devices with a width up to 1200 pixels (widescreen resolution of the iPad is 1024 pixels, for example).
-This is because the breakpoint is set to <a href="https://getbootstrap.com/docs/4.0/layout/overview/#responsive-breakpoints">media-breakpoint-down(lg)</a>. <br/>
+This is because the breakpoint is set to <a href="https://getbootstrap.com/docs/4.5/layout/overview/#responsive-breakpoints">media-breakpoint-down(lg)</a>. <br/>
 If you think there is enough space to show the content plus the blocks column side by side on a screen width of 992 pixels and up, then enable this setting. It will change the breakpoint to media-breakpoint-down(md). This will break the blocks column only on screens with widths of less than 992 pixels.';
 // ...Additional resources.
 $string['additionalresourcesheadingsetting'] = 'Additional resources';