diff --git a/Include/exprtk/exprtk.hpp b/Include/exprtk/exprtk.hpp
index da493c59..f28b4a44 100644
--- a/Include/exprtk/exprtk.hpp
+++ b/Include/exprtk/exprtk.hpp
@@ -2392,9 +2392,7 @@ namespace exprtk
                case e_colon : return ":";
                case e_eof   : return ";";
                default      : return "UNKNOWN";
-            }
-
-            return "UNKNOWN";
+               }
          }
 
          inline bool is_error() const
diff --git a/README.md b/README.md
index 83fb0846..73b521b4 100644
--- a/README.md
+++ b/README.md
@@ -301,7 +301,7 @@ Additional libraries used in **suanPan** are listed as follows.
 - [**Catch2**](https://github.com/catchorg/Catch2) version 3.7.1
 - [**fmt**](https://github.com/fmtlib/fmt) version 10.2.1
 - [**whereami**](https://github.com/gpakosz/whereami)
-- [**exprtk**](https://github.com/ArashPartow/exprtk)
+- [**exprtk**](https://github.com/ArashPartow/exprtk) version 0.0.3
 - [**magic_enum**](https://github.com/Neargye/magic_enum) version 0.9.7
 - **thread_pool** abridged version of [`thread-pool`](https://github.com/bshoshany/thread-pool)