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 c5de8bb..507907d 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>2.1.20</version>
+    <version>2.1.37</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 2.1.20 (2019-10-17)</releaseNotes>
+    <releaseNotes>upgrade to 2.1.37 (2021-04-22)</releaseNotes>
     <copyright>2019 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 79fdc93..aab04f9 100755
--- a/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1
+++ b/packages/kopano-ol-extension-nightly/tools/chocolateyinstall.ps1
@@ -1,18 +1,18 @@
 # Kopano Outlook Extension
-# 2017-2019 foo.li systeme + software
+# 2017-2021 foo.li systeme + software
 # https://www.gnu.org/licenses/gpl.txt
 
 $packageName    = 'kopano-ol-extension-nightly'
 $packageSearch  = 'Kopano OL Extension'
 $installerType  = 'msi'
 $silentArgs     = '/qb'
-$version        = '2.1.20'
-$intvers        = '2.1-20'
+$version        = '2.1.37'
+$intvers        = '2.1-37'
 $url            = 'https://download.kopano.io/community/olextension:/KopanoOLExtension-' + $intvers + '-32bit.msi'
 $url64          = 'https://download.kopano.io/community/olextension:/KopanoOLExtension-' + $intvers + '-64bit.msi'
-$checksum       = 'f34ae6b4451da62b11ba257726b335e25aa0488e'
+$checksum       = '730d21aa3c84c00f059dae14d9b60e48cae3758c'
 $checksumType   = 'sha1'
-$checksum64     = '1e11b39733c83c18b655aa6e595d768a505347df'
+$checksum64     = '1eaed9945998a6b8bf66952760760ecfb2aa8fa6'
 $checksumType64 = $checksumType
 
 try {