diff --git a/resources/win/yubioath-desktop.wxs b/resources/win/yubioath-desktop.wxs
index a3e1257a..ca92b536 100644
--- a/resources/win/yubioath-desktop.wxs
+++ b/resources/win/yubioath-desktop.wxs
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
 	xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">
-  <?define ProductVersion="6.0.0" ?>
+  <?define ProductVersion="6.1.1" ?>
   <?define ProductName="Yubico Authenticator" ?>
 
    <Product Id="*" UpgradeCode="fcbafc57-aaaa-47b8-b861-20bda48cd4f6" Name="$(var.ProductName)" Version="$(var.ProductVersion)" Manufacturer="Yubico AB" Language="1033">
diff --git a/set-version.py b/set-version.py
index d45050c5..15b84066 100755
--- a/set-version.py
+++ b/set-version.py
@@ -23,7 +23,7 @@ This script updates version numbers in various files.
 
 version_pattern = r"(\d+)\.(\d+)\.(\d+)(-[^\s+]+)?"
 lib_version_pattern = rf"const\s+String\s+version\s+=\s+'({version_pattern})';"
-lib_build_pattern = rf"const\s+int\s+build\s+=\s+(\d+);"
+lib_build_pattern = r"const\s+int\s+build\s+=\s+(\d+);"
 
 
 def sub1(pattern, repl, string):
@@ -32,6 +32,7 @@ def sub1(pattern, repl, string):
         raise ValueError(f"Did not find string matching {pattern} to replace")
     return buf
 
+
 def update_file(fname, func):
     with open(fname) as f:
         orig = f.read()
@@ -43,6 +44,7 @@ def update_file(fname, func):
             f.write(buf)
         print("Updated", fname)
 
+
 def read_lib_version():
     with open("lib/version.dart") as f:
         buf = f.read()
@@ -77,6 +79,7 @@ def update_lib(buf):
 
     return buf
 
+
 # Handle invocation
 args = sys.argv[1:]
 if not args:
@@ -95,27 +98,29 @@ else:
     sys.exit(1)
 
 # x.y.z without trailing part
-short_version = re.search("(\d+\.\d+\.\d+)", version).group()
+short_version = re.search(r"(\d+\.\d+\.\d+)", version).group()
+
 
 # pubspec.yaml
 def update_pubspec(buf):
     return sub1(
-        r'version:\s+\d+\.\d+\.\d+.*\+\d+',
-        f'version: {version}+{build}',
+        r"version:\s+\d+\.\d+\.\d+.*\+\d+",
+        f"version: {version}+{build}",
         buf,
     )
 
+
 # Helper version_info
 def update_helper_version(buf):
     version_tuple = repr(tuple(int(d) for d in short_version.split(".")) + (0,))
     buf = sub1(
-        rf'filevers=\(\d+, \d+, \d+, \d+\)',
-        f'filevers={version_tuple}',
+        r"filevers=\(\d+, \d+, \d+, \d+\)",
+        f"filevers={version_tuple}",
         buf,
     )
     buf = sub1(
-        rf'prodvers=\(\d+, \d+, \d+, \d+\)',
-        f'prodvers={version_tuple}',
+        r"prodvers=\(\d+, \d+, \d+, \d+\)",
+        f"prodvers={version_tuple}",
         buf,
     )
     buf = sub1(
@@ -130,6 +135,7 @@ def update_helper_version(buf):
     )
     return buf
 
+
 # release-win.ps1
 def update_release_win(buf):
     return sub1(
@@ -138,6 +144,17 @@ def update_release_win(buf):
         buf,
     )
 
+
+# MSI .wxs file
+def update_win_msi(buf):
+    return sub1(
+        rf'ProductVersion="{version_pattern}"',
+        f'ProductVersion="{short_version}"',
+        buf,
+    )
+
+
 update_file("pubspec.yaml", update_pubspec)
 update_file("helper/version_info.txt", update_helper_version)
 update_file("resources/win/release-win.ps1", update_release_win)
+update_file("resources/win/yubioath-desktop.wxs", update_win_msi)