diff --git a/.gitmodules b/.gitmodules
index f971a02..745ba9b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,6 +16,6 @@
   path = externals/MARBL
   url = https://github.com/marbl-ecosys/MARBL.git
   fxDONOTUSEurl = https://github.com/marbl-ecosys/MARBL.git
-    fxtag = marbl0.50.0
+    fxtag = marbl0.50.3
     fxrequired = AlwaysRequired
 
diff --git a/externals/MARBL b/externals/MARBL
index 403f6c5..f00d642 160000
--- a/externals/MARBL
+++ b/externals/MARBL
@@ -1 +1 @@
-Subproject commit 403f6c50bba305d59910031dae33ff0629fb8602
+Subproject commit f00d64234dbb947101f183b99d60437a08bb778b