diff --git a/core/wiki/config/OfficialPluginLibrary.tid b/core/wiki/config/OfficialPluginLibrary.tid
index 2bbc1eaa0..f98be9acc 100644
--- a/core/wiki/config/OfficialPluginLibrary.tid
+++ b/core/wiki/config/OfficialPluginLibrary.tid
@@ -1,6 +1,6 @@
 title: $:/config/OfficialPluginLibrary
 tags: $:/tags/PluginLibrary
-url: http://tiddlywiki.com/library/v5.1.8/index.html
+url: http://tiddlywiki.com/library/v5.1.9/index.html
 caption: {{$:/language/OfficialPluginLibrary}}
 
 The official ~TiddlyWiki plugin library at tiddlywiki.com. Plugins, themes and language packs are maintained by the core team.
diff --git a/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid b/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
index de3887c17..2f3859d83 100644
--- a/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
+++ b/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
@@ -1,6 +1,6 @@
 title: $:/config/LocalPluginLibrary
 tags: $:/tags/PluginLibrary
-url: http://127.0.0.1:8080/prerelease/library/v5.1.8/index.html
+url: http://127.0.0.1:8080/prerelease/library/v5.1.9/index.html
 caption: {{$:/language/OfficialPluginLibrary}} (Prerelease Local)
 
 A locally installed version of the official ~TiddlyWiki plugin library at tiddlywiki.com for testing and debugging. //Requires a local web server to share the library//
diff --git a/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid b/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid
index e9c72f74a..824545dcb 100644
--- a/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid
+++ b/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid
@@ -1,6 +1,6 @@
 title: $:/config/OfficialPluginLibrary
 tags: $:/tags/PluginLibrary
-url: http://tiddlywiki.com/prerelease/library/v5.1.8/index.html
+url: http://tiddlywiki.com/prerelease/library/v5.1.9/index.html
 caption: {{$:/language/OfficialPluginLibrary}} (Prerelease)
 
 The prerelease version of the official ~TiddlyWiki plugin library at tiddlywiki.com. Plugins, themes and language packs are maintained by the core team.