diff --git a/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid b/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
index 391c6e684..59dd3cabf 100644
--- a/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
+++ b/editions/prerelease/tiddlers/system/PrereleaseLocalPluginLibrary.tid
@@ -1,6 +1,6 @@
 title: $:/config/LocalPluginLibrary
 tags: $:/tags/PluginLibrary
-url: http://127.0.0.1:8080/prerelease/library/v5.1.18/index.html
+url: http://127.0.0.1:8080/prerelease/library/v5.1.19/index.html
 caption: {{$:/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 c14019b28..dadeaa3fa 100644
--- a/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid
+++ b/editions/prerelease/tiddlers/system/PrereleaseOfficialPluginLibrary.tid
@@ -1,6 +1,6 @@
 title: $:/config/OfficialPluginLibrary
 tags: $:/tags/PluginLibrary
-url: https://tiddlywiki.com/prerelease/library/v5.1.18/index.html
+url: https://tiddlywiki.com/prerelease/library/v5.1.19/index.html
 caption: {{$:/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.