diff --git a/automatic/firefox-nightly/firefox-nightly.json b/automatic/firefox-nightly/firefox-nightly.json
index 3baa18867..584dc95e5 100644
--- a/automatic/firefox-nightly/firefox-nightly.json
+++ b/automatic/firefox-nightly/firefox-nightly.json
@@ -1,3 +1,3 @@
 {
-    "nightly":  "73.0.1.2019123021-alpha"
+    "nightly":  "73.0.1.2019123109-alpha"
 }
diff --git a/automatic/firefox-nightly/firefox-nightly.nuspec b/automatic/firefox-nightly/firefox-nightly.nuspec
index 6286eccd0..35ea5f46f 100644
--- a/automatic/firefox-nightly/firefox-nightly.nuspec
+++ b/automatic/firefox-nightly/firefox-nightly.nuspec
@@ -26,7 +26,7 @@ This is a nuspec. It mostly adheres to https://docs.nuget.org/create/Nuspec-Refe
     <!-- version should MATCH as closely as possible with the underlying software -->
     <!-- Is the version a prerelease of a version? https://docs.nuget.org/create/versioning#creating-prerelease-packages -->
     <!-- Note that unstable versions like 0.0.1 can be considered a released version, but it's possible that one can release a 0.0.1-beta before you release a 0.0.1 version. If the version number is final, that is considered a released version and not a prerelease. -->
-    <version>73.0.1.2019123021-alpha</version>
+    <version>73.0.1.2019123109-alpha</version>
     <!-- owners is a poor name for maintainers of the package. It sticks around by this name for compatibility reasons. It basically means you. -->
     <owners>Maurice Kevenaar</owners>
     <!-- ============================== -->
diff --git a/automatic/firefox-nightly/tools/LanguageChecksums.csv b/automatic/firefox-nightly/tools/LanguageChecksums.csv
index cbf1138c9..1987a212c 100644
--- a/automatic/firefox-nightly/tools/LanguageChecksums.csv
+++ b/automatic/firefox-nightly/tools/LanguageChecksums.csv
@@ -47,7 +47,7 @@ en-CA|64|b3e8a386c101f2b7b47abcafd6a7ae613fed53b98437c7f09deece49518cd220859cab3
 en-GB|32|34d5527d5f32d6ef9d629239269afe5a59366c0ccab8f4d66f0b5a9681a57aab7bff9716a3c614adbbdec241024909284cc700526f5e9d3e40f28e7e47449f1e
 en-GB|64|6aec9cbda0d7bc757daa67ee2932b9ff12dcbc603288ec99f88015d7a38fa9f7a689c5eb4012a5cec2598098bd2b2c4a52a9806d184e34f591a5580816d5ce21
 en-US|32|5b1a0f0b8a92cd646e6772df49104a8f02bae07108e6a4d46ffde9a2c123d16650bac39fff2617ed00053fdab0b33e296968e8977124215a79189703dc5facc5
-en-US|64|e7a09e297dd681ef8f6a42c4003c0bb81ebf28e813a764848d23e9e0cdfaf3f296e17e87c5dc482b3c2cc9444b8160778e8202a289d98f9bebbfc61e10dd4682
+en-US|64|8f8fd7ac9c6da50be6e270b7aabb2cbe91bab867c263fe7d1d06a8a719987b91f616ef5292df9e6833664716576f589065b5c61a210c73652ffbe9fcf760b49b
 eo|32|cce2e8b77caf472e6f6edb152fb54346229e7b0c5e539720aaf64c8ca0ab10808b94f527f999ed4d6d3ce9b974e1698b0f8180e5a603e61666f5990ab1bdc1fa
 eo|64|68bec887cb6a81d845f773a7061b68b4cdf272c6fec3d75eada90a032100f19abce541f0dff152a7abe341dafec45bbf31e71feca537492f1a3590e2569562fb
 es-AR|32|a97a0692719f4a224d3abfd4cc0ae5e874a58f10e34e757b3a93d71066014fd2c8e333dafe604eb963f233e973d4bfdeb227e6ffe75e68990cc593fa16ca1b7a
diff --git a/automatic/firefox-nightly/tools/chocolateyInstall.ps1 b/automatic/firefox-nightly/tools/chocolateyInstall.ps1
index 0d9663b51..bfe16d2f1 100644
--- a/automatic/firefox-nightly/tools/chocolateyInstall.ps1
+++ b/automatic/firefox-nightly/tools/chocolateyInstall.ps1
@@ -34,7 +34,7 @@ if (Get-32bitOnlyInstalled -product $softwareName) {
 
     Checksum = $checksums.Win32
     ChecksumType = 'sha512'
-    Url = "https://archive.mozilla.org/pub/firefox/nightly/2019/12/2019-12-30-21-49-31-mozilla-central/firefox-73.0a1.${locale}.win32.installer.exe"
+    Url = "https://archive.mozilla.org/pub/firefox/nightly/2019/12/2019-12-31-09-43-49-mozilla-central/firefox-73.0a1.${locale}.win32.installer.exe"
 
     silentArgs = '-ms'
     validExitCodes = @(0)
@@ -43,7 +43,7 @@ if (Get-32bitOnlyInstalled -product $softwareName) {
   if (!(Get-32bitOnlyInstalled($softwareName)) -and (Get-OSArchitectureWidth 64)) {
     $packageArgs.Checksum64 = $checksums.Win64
     $packageArgs.ChecksumType64 = 'sha512'
-    $packageArgs.Url64 = "https://archive.mozilla.org/pub/firefox/nightly/2019/12/2019-12-30-21-49-31-mozilla-central/firefox-73.0a1.${locale}.win64.installer.exe"
+    $packageArgs.Url64 = "https://archive.mozilla.org/pub/firefox/nightly/2019/12/2019-12-31-09-43-49-mozilla-central/firefox-73.0a1.${locale}.win64.installer.exe"
   }
 
   Install-ChocolateyPackage @packageArgs