diff --git a/.gitmodules b/.gitmodules
index 0597d1a..02ace53 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,6 +7,7 @@
 [submodule "exprtk.git"]
 	path = exprtk
 	url = https://github.com/ArashPartow/exprtk.git
+	branch = release
 [submodule "exprtk-custom-types.git"]
 	path = exprtk-custom-types
 	url = https://github.com/ArashPartow/exprtk-custom-types.git
diff --git a/exprtk b/exprtk
index 7b99390..a4b17d5 160000
--- a/exprtk
+++ b/exprtk
@@ -1 +1 @@
-Subproject commit 7b993904a21639304edd4db261f6e2cdcf6d936b
+Subproject commit a4b17d543f072d2e3ba564e4bc5c3a0d2b05c338