diff --git a/environment_gcc4.yml b/environment_gcc4.yml
index db354608d3fb46a8e981a7a69054a4457537ce04..729f77e6377184dbccc3c348705e2f404be07fca 100644
--- a/environment_gcc4.yml
+++ b/environment_gcc4.yml
@@ -15,6 +15,7 @@ dependencies:
   - bzip2
   - cmake >=3.15
   - cspice
+  - csm>=3.0.3,<3.0.4
   - curl
   - doxygen
   - eigen