diff --git a/src/AzureSignTool/Program.cs b/src/AzureSignTool/Program.cs
index f1b6879..d492568 100644
--- a/src/AzureSignTool/Program.cs
+++ b/src/AzureSignTool/Program.cs
@@ -457,9 +457,9 @@ private bool ValidateArguments(CommandRunContext context)
                 valid = false;
             }
 
-            if (AppendSignature && !OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (AppendSignature && !OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
-                context.Error.WriteLine("'--append-signature' requires Windows 11 or later.");
+                context.Error.WriteLine("'--append-signature' requires Windows Server 2022, Windows 11 or later.");
                 valid = false;
             }
 
diff --git a/test/AzureSign.Core.Tests/AuthenticodeKeyVaultSignerTests.cs b/test/AzureSign.Core.Tests/AuthenticodeKeyVaultSignerTests.cs
index df5bbb4..b25ae07 100644
--- a/test/AzureSign.Core.Tests/AuthenticodeKeyVaultSignerTests.cs
+++ b/test/AzureSign.Core.Tests/AuthenticodeKeyVaultSignerTests.cs
@@ -27,7 +27,7 @@ public void ShouldSignExeWithRSASigningCertificates_Sha1FileDigest(string certif
             var fileToSign = GetFileToSign();
             var result = signer.SignFile(fileToSign, null, null, null);
             Assert.Equal(0, result);
-            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
                 result = signer.SignFile(fileToSign, null, null, null, appendSignature: true);
                 Assert.Equal(0, result);
@@ -45,7 +45,7 @@ public void ShouldSignExeWithRSASigningCertificates_Sha256FileDigest(string cert
             var fileToSign = GetFileToSign();
             var result = signer.SignFile(fileToSign, null, null, null);
             Assert.Equal(0, result);
-            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
                 result = signer.SignFile(fileToSign, null, null, null, appendSignature: true);
                 Assert.Equal(0, result);
@@ -64,7 +64,7 @@ public void ShouldSignExeWithECDsaSigningCertificates_Sha256FileDigest(string ce
             var fileToSign = GetFileToSign();
             var result = signer.SignFile(fileToSign, null, null, null);
             Assert.Equal(0, result);
-            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
                 result = signer.SignFile(fileToSign, null, null, null, appendSignature: true);
                 Assert.Equal(0, result);
@@ -83,7 +83,7 @@ public void ShouldSignExeWithECDsaSigningCertificates_Sha256FileDigest_WithTimes
             var fileToSign = GetFileToSign();
             var result = signer.SignFile(fileToSign, null, null, null);
             Assert.Equal(0, result);
-            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
                 result = signer.SignFile(fileToSign, null, null, null, appendSignature: true);
                 Assert.Equal(0, result);
@@ -103,7 +103,7 @@ public void ShouldSignExeWithRSASigningCertificates_Sha256FileDigest_WithTimesta
             var fileToSign = GetFileToSign();
             var result = signer.SignFile(fileToSign, null, null, null);
             Assert.Equal(0, result);
-            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000))
+            if (OperatingSystem.IsWindowsVersionAtLeast(10, 0, 20348))
             {
                 result = signer.SignFile(fileToSign, null, null, null, appendSignature: true);
                 Assert.Equal(0, result);