diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index 5b6ad8963347bacc305fec45e31005b536d76e73..48a310244b8ebd5c3d1b59aa85bb2eadcd30424c 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -78,7 +78,7 @@ RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
       --s3-endpoint-url https://eics3.sdcc.bnl.gov:9000                 \
       --s3-access-key-id "${S3_ACCESS_KEY}"                             \
       --s3-access-key-secret "${S3_SECRET_KEY}"                         \
-      eics3 s3://eictest/EPIC/spack                                     \
+      eics3 s3://eictest/EPIC/spack/${SPACK_VERSION}                    \
     ; fi                                                                \
  && spack mirror list
 
diff --git a/mirrors.yaml.in b/mirrors.yaml.in
index 73904d3e00a96992311947c743984f9c96df1cc1..369db4061d0482e90f278154475fae1aad1de219 100644
--- a/mirrors.yaml.in
+++ b/mirrors.yaml.in
@@ -1,7 +1,7 @@
 mirrors:
   eics3rw:
     fetch:
-      url: s3://eictest/EPIC/spack
+      url: s3://eictest/EPIC/spack/${SPACK_VERSION}
       access_pair:
       - ${S3RW_ACCESS_KEY}
       - ${S3RW_SECRET_KEY}
@@ -9,7 +9,7 @@ mirrors:
       profile: null
       endpoint_url: https://eics3.sdcc.bnl.gov:9000
     push:
-      url: s3://eictest/EPIC/spack
+      url: s3://eictest/EPIC/spack/${SPACK_VERSION}
       access_pair:
       - ${S3RW_ACCESS_KEY}
       - ${S3RW_SECRET_KEY}