diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51696e10..ea1f2b43 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -247,7 +247,7 @@ jobs:
           make -C t show-failure-results
       - name: Install Wix Toolset v4
         run: |
-          dotnet tool install --global wix --version 4.0.4
+          dotnet tool install --global wix --version 4.0.5
       - name: Install Wix UI Extension
         run: |
           wix extension add -g WixToolset.UI.wixext
diff --git a/contrib/wix/README.md b/contrib/wix/README.md
index 7d65b485..af1ec9cd 100644
--- a/contrib/wix/README.md
+++ b/contrib/wix/README.md
@@ -4,12 +4,12 @@ This directory contains files supporting the build of an MSI
 installer for Windows environments.
 
 The MSI is built using the [WiX Toolset](https://wixtoolset.org/)
-version 4.0.4.
+version 4.0.5.
 
 The WiX Toolset may be installed with the following command:
 
 ```
-dotnet tool install --global wix --version 4.0.4
+dotnet tool install --global wix --version 4.0.5
 ```
 
 The installer also requires the WixUI extension, which can be