diff --git a/build_env/conda_jekyll.yml b/build_env/conda_jekyll.yml
index ca79099..99f9976 100644
--- a/build_env/conda_jekyll.yml
+++ b/build_env/conda_jekyll.yml
@@ -2,7 +2,7 @@ name: jekyll
 dependencies:
   - Python
   - pip
-  - ruby>3
+  - ruby>2.5
   - rb-bundler>2.1
   - c-compiler
   - cmake