diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2f1c52..083c6a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 ### Added
 
+## [6.5.0] - 2026-03-26
+
+### Changed
+
+- Add `USE_DSL` environment variable pilot a swap from the regular `GEOSpyD` python to the `DSL/latest` stack
+
 ## [6.4.1] - 2026-03-26
 
 ### Fixed
diff --git a/g5_modules b/g5_modules
index 77a808b..c108dc1 100755
--- a/g5_modules
+++ b/g5_modules
@@ -132,7 +132,12 @@ if ( $site == NCCS ) then
 
    set basedir = /discover/swdev/gmao_SIteam/Baselibs/ESMA-Baselibs-9.7.1/x86_64-pc-linux-gnu/ifort_2021.13.0-intelmpi_2021.13.0
 
-   set mod1 = python/GEOSpyD/25.3.1-0/3.13
+   if ($?USE_DSL) then
+      set mod1 = DSL/latest
+   else
+      set mod1 = python/GEOSpyD/25.3.1-0/3.13
+   endif
+   
    set mod2 = GEOSenv
 
    set mod3 = comp/gcc/12.3.0