diff --git a/environment.yml b/environment.yml
index 27cf51d1a78fed8a56d7e2b959f9c57e12378080..397a80056e641a1124fa86c02572bdbf86c45c51 100644
--- a/environment.yml
+++ b/environment.yml
@@ -24,7 +24,7 @@ dependencies:
   - geotiff
   - gmp
   - graphviz
-  - gsl>=2.6
+  - gsl>=2.6, <2.7
   - hdf5
   - icu
   - inja