diff --git a/packages/kopano-ol-extension-nightly/kopano-ol-extension-nightly.nuspec b/packages/kopano-ol-extension-nightly/kopano-ol-extension-nightly.nuspec
index 6abdbab..c840ee1 100755
--- a/packages/kopano-ol-extension-nightly/kopano-ol-extension-nightly.nuspec
+++ b/packages/kopano-ol-extension-nightly/kopano-ol-extension-nightly.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>kopano-ol-extension-nightly</id>
-        <version>2.0.310</version>
+        <version>2.0.311</version>
         <title>Kopano Outlook Extension</title>
         <authors>Kopano</authors>
         <owners>foo.li systeme + software</owners>
@@ -12,7 +12,7 @@
         <requireLicenseAcceptance>true</requireLicenseAcceptance>
         <description>Kopano Outlook Extension (nightly)</description>
         <summary>Kopano OL Extension Nightly (unsupported)</summary>
-        <releaseNotes>upgrade to 2.0.310 (09-08-2018)</releaseNotes>
+        <releaseNotes>upgrade to 2.0.311 (22-08-2018)</releaseNotes>
         <copyright>2018 Kopano</copyright>
         <language />
         <tags>groupware kopano outlook-extension nightly</tags>
diff --git a/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1 b/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1
index 918dc62..7003e54 100755
--- a/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1
+++ b/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1
@@ -6,13 +6,13 @@ $packageName    = 'kopano-ol-extension-nightly'
 $packageSearch  = 'Kopano OL Extension'
 $installerType  = 'msi'
 $silentArgs     = '/qb'
-$version        = '2.0.310'
-$intvers        = '2.0-310'
+$version        = '2.0.311'
+$intvers        = '2.0-311'
 $url            = 'https://download.kopano.io/community/olextension:/KopanoOLExtension-' + $intvers + '-32bit.msi'
 $url64          = 'https://download.kopano.io/community/olextension:/KopanoOLExtension-' + $intvers + '-64bit.msi'
-$checksum       = '07B4D8AAC64D96425464C8EB0CA58C5E7B040632'
+$checksum       = '4C68DD392ABF1585975C47ACA7DA633E7B93B8F7'
 $checksumType   = 'sha1'
-$checksum64     = 'A46670D45024B0F66F98B3D3ADC3B9827F53AD8A'
+$checksum64     = '34722E8AFE045D44F291F76D4BC2F3D4E20140AA'
 $checksumType64 = $checksumType
 
 try {