diff --git a/env/merlin/sysconfigs/packages.yaml b/env/merlin/sysconfigs/packages.yaml
index a0d7620..379d2b1 100644
--- a/env/merlin/sysconfigs/packages.yaml
+++ b/env/merlin/sysconfigs/packages.yaml
@@ -114,11 +114,6 @@ packages:
     externals:
       - prefix: /opt/psi/Programming/intel/22.2
         spec: intel-oneapi-mpi@2021.6.0
-  jsoncpp:
-    buildable: false
-    externals:
-      - prefix: /usr
-        spec: jsoncpp@1.9.4
   libcroco:
     buildable: false
     externals: