diff --git a/conda-reqs/chipyard.yaml b/conda-reqs/chipyard.yaml
index a85e0e49..179788ca 100644
--- a/conda-reqs/chipyard.yaml
+++ b/conda-reqs/chipyard.yaml
@@ -79,7 +79,7 @@ dependencies:
     - zlib
     - vim
     - git
-    - openjdk
+    - openjdk<20
     - gengetopt
     - libffi
     - expat