diff --git a/source/Calamari.Common/Features/Processes/CommandLineInvocation.cs b/source/Calamari.Common/Features/Processes/CommandLineInvocation.cs
index b46196025c..22e36bfd10 100644
--- a/source/Calamari.Common/Features/Processes/CommandLineInvocation.cs
+++ b/source/Calamari.Common/Features/Processes/CommandLineInvocation.cs
@@ -43,6 +43,11 @@ public CommandLineInvocation(string executable, params string[] arguments)
         /// </summary>
         public bool OutputAsVerbose { get; set; }
 
+        /// <summary>
+        /// Use UTF-8 encoding for standard output and error streams.
+        /// </summary>
+        public bool UseUTF8 { get; set; }
+
         /// <summary>
         /// Add a non-standard output destination for the execution output
         /// </summary>
diff --git a/source/Calamari.Common/Features/Processes/CommandLineRunner.cs b/source/Calamari.Common/Features/Processes/CommandLineRunner.cs
index 46eec48982..7b49e4caf9 100644
--- a/source/Calamari.Common/Features/Processes/CommandLineRunner.cs
+++ b/source/Calamari.Common/Features/Processes/CommandLineRunner.cs
@@ -34,7 +34,8 @@ public CommandResult Execute(CommandLineInvocation invocation)
                     invocation.UserName,
                     invocation.Password,
                     commandOutput.WriteInfo,
-                    commandOutput.WriteError);
+                    commandOutput.WriteError,
+                    invocation.UseUTF8);
 
                 return new CommandResult(
                     invocation.ToString(),
diff --git a/source/Calamari.Common/Features/Processes/SilentProcessRunner.cs b/source/Calamari.Common/Features/Processes/SilentProcessRunner.cs
index 7a735430af..61eb5cae6a 100644
--- a/source/Calamari.Common/Features/Processes/SilentProcessRunner.cs
+++ b/source/Calamari.Common/Features/Processes/SilentProcessRunner.cs
@@ -51,7 +51,8 @@ public static SilentProcessRunnerResult ExecuteCommand(
                 null,
                 null,
                 output,
-                error);
+                error,
+                false);
         }
 
         public static SilentProcessRunnerResult ExecuteCommand(
@@ -69,7 +70,8 @@ public static SilentProcessRunnerResult ExecuteCommand(
                 null,
                 null,
                 output,
-                error);
+                error,
+                false);
         }
 
         public static SilentProcessRunnerResult ExecuteCommand(
@@ -80,7 +82,8 @@ public static SilentProcessRunnerResult ExecuteCommand(
             string? userName,
             SecureString? password,
             Action<string> output,
-            Action<string> error)
+            Action<string> error,
+            bool useUtf8Encoding)
         {
             try
             {
@@ -93,8 +96,8 @@ public static SilentProcessRunnerResult ExecuteCommand(
                     process.StartInfo.CreateNoWindow = true;
                     process.StartInfo.RedirectStandardOutput = true;
                     process.StartInfo.RedirectStandardError = true;
-                    process.StartInfo.StandardOutputEncoding = oemEncoding;
-                    process.StartInfo.StandardErrorEncoding = oemEncoding;
+                    process.StartInfo.StandardOutputEncoding = useUtf8Encoding ? Encoding.UTF8 : oemEncoding;
+                    process.StartInfo.StandardErrorEncoding = useUtf8Encoding ? Encoding.UTF8 : oemEncoding;
 
                     if (environmentVars != null)
                         foreach (var environmentVar in environmentVars.Keys)
diff --git a/source/Calamari.Common/Features/Scripting/DotnetScript/DotnetScriptExecutor.cs b/source/Calamari.Common/Features/Scripting/DotnetScript/DotnetScriptExecutor.cs
index b581fdab59..1fcb2c8f41 100644
--- a/source/Calamari.Common/Features/Scripting/DotnetScript/DotnetScriptExecutor.cs
+++ b/source/Calamari.Common/Features/Scripting/DotnetScript/DotnetScriptExecutor.cs
@@ -41,6 +41,7 @@ protected override IEnumerable<ScriptExecution> PrepareExecution(Script script,
             cli.EnvironmentVars = environmentVars;
             cli.WorkingDirectory = workingDirectory;
             cli.Isolate = !bypassDotnetScriptIsolation;
+            cli.UseUTF8 = true; /* TODO Make UTF-8 encoding an opt-out setting */
 
             cli.AdditionalInvocationOutputSink = outputSink;
 
diff --git a/source/Calamari.Common/Features/Scripting/WindowsPowerShell/PowerShellScriptExecutor.cs b/source/Calamari.Common/Features/Scripting/WindowsPowerShell/PowerShellScriptExecutor.cs
index 3d51405afd..f27e487939 100644
--- a/source/Calamari.Common/Features/Scripting/WindowsPowerShell/PowerShellScriptExecutor.cs
+++ b/source/Calamari.Common/Features/Scripting/WindowsPowerShell/PowerShellScriptExecutor.cs
@@ -51,7 +51,8 @@ protected override IEnumerable<ScriptExecution> PrepareExecution(Script script,
                 EnvironmentVars = effectiveEnvironmentVars,
                 WorkingDirectory = Path.GetDirectoryName(script.File),
                 UserName = powerShellBootstrapper.AllowImpersonation() ? variables.Get(PowerShellVariables.UserName) : null,
-                Password = powerShellBootstrapper.AllowImpersonation() ? ToSecureString(variables.Get(PowerShellVariables.Password)) : null
+                Password = powerShellBootstrapper.AllowImpersonation() ? ToSecureString(variables.Get(PowerShellVariables.Password)) : null,
+                UseUTF8 = true, /* TODO Make UTF-8 encoding an opt-out setting */
             };
 
             return new[]