diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 56b17cb041ddbfee40d9eca3e861a3b936264052..536fe243e93e0389c81368bab6af56691b186b6a 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 54df0145d6fc67aafc9ffba4bad4595b7657e9ff..e336307c6315628c1a1fecef4b4b1ba25f7034ea 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'