--- a/textext/base.py
+++ b/textext/base.py
@@ -95,7 +95,16 @@ class TexText(inkex.EffectExtension):
     def __init__(self):
 
         self.config = Settings(directory=defaults.textext_config_path)
+        # config.json is stored in ~/.config/inkscape/extensions/textext for
+        # the next invocation, but since that next invocation could be using
+        # a different latex derivation, make sure we overwrite the executable
+        # paths with updated ones:
+        self.config["pdflatex-executable"] = "@pdflatex@/bin/pdflatex";
+        self.config["lualatex-executable"] = "@lualatex@/bin/lualatex";
         self.cache = Cache(directory=defaults.textext_config_path)
+        if "requirements_checker" in self.cache.values:
+            self.cache["requirements_checker"]["available_tex_to_pdf_converters"]["pdflatex"] = "@pdflatex@/bin/pdflatex";
+            self.cache["requirements_checker"]["available_tex_to_pdf_converters"]["lualatex"] = "@lualatex@/bin/lualatex";
         previous_exit_code = self.cache.get("previous_exit_code", None)
 
         if previous_exit_code is None: