diff --git a/sealoader_gui.py b/sealoader_gui.py
index 7d4b59a..67a4461 100644
--- a/sealoader_gui.py
+++ b/sealoader_gui.py
@@ -902,16 +902,19 @@ class SeaLoaderApp(tk.Tk):
 
             # Create updater PowerShell script
             ps_path = os.path.join(tmpdir, 'sealoader_updater.ps1')
-            ps = f"""
+            pid_val = os.getpid()
+            target_val = current_exe.replace("'", "''")
+            source_val = new_exe_path.replace("'", "''")
+            ps = """
 $ErrorActionPreference = 'Stop'
-$pidToWait = {os.getpid()}
-$target = '{current_exe}'.Replace("'","''")
-$source = '{new_exe_path}'.Replace("'","''")
-while (Get-Process -Id $pidToWait -ErrorAction SilentlyContinue) { Start-Sleep -Milliseconds 200 }
+$pidToWait = {pid}
+$target = '{target}'.Replace("'","''")
+$source = '{source}'.Replace("'","''")
+while (Get-Process -Id $pidToWait -ErrorAction SilentlyContinue) {{ Start-Sleep -Milliseconds 200 }}
 Move-Item -Force -LiteralPath $source -Destination $target
 Start-Process -FilePath $target
 Remove-Item -LiteralPath $PSCommandPath -Force
-"""
+""".format(pid=pid_val, target=target_val, source=source_val)
             with open(ps_path, 'w', encoding='utf-8') as f:
                 f.write(ps)