diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index fe6a1f60e14025793ef1258ddaa8d5174c48fe19..5cd62a81139968afe1b8ee8be2d3c528c21d9012 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -149,6 +149,9 @@ packages:
     require:
     - '@2.1.2'
     - -ipo +podio +root +zmq
+  juggler:
+    require:
+    - cxxstd=20
   lcov:
     require:
     - '@1.16'