diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 48939823eabb66058ae4fa988e855e98c60f2ac1..e7edc0fa5ab2f5b1a496be00e5b096fd45d7528f 100644
--- a/spack-environment/dev/spack.yaml
+++ b/spack-environment/dev/spack.yaml
@@ -18,6 +18,7 @@ spack:
     - dawncut
     - dd4hep
     - dpmjet
+    - east
     - edm4eic
     - edm4hep
     - eic-smear
diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index aa7a132ddd8db635164d74cdc2469e381ae09599..ed0364bd4fa830a891135b3b24ca63f304b6482e 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -70,6 +70,9 @@ packages:
   dpmjet:
     require:
     - '@19.3.5'
+  east:
+    require:
+    - '@656aa3192b097a631ddd1e0380e80c26fd6644a7=main'
   edm4eic:
     require:
     - '@2.0.0'