diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug-aarch64/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug-aarch64/spack.yaml
index 40917b600f7aae001dedbba9b0f9553c1e6fb821..c32ecb9a4bf2d5f99e019426f86e09d8064fba65 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug-aarch64/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug-aarch64/spack.yaml
@@ -225,7 +225,7 @@ spack:
     - - $compiler
     - - $target
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/aws-ahug-aarch64" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/aws-ahug-aarch64" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
index 6483e72b971ffec2f0063b197893264d718038cb..2e25738d93017ea26c37a8246bed8fa99a757840 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
@@ -222,7 +222,7 @@ spack:
     - - $compiler
     - - $target
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/aws-ahug" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/aws-ahug" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc-aarch64/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc-aarch64/spack.yaml
index 1c4e2de308eea298a4bb802b2c29c68519e3c967..ccc384ac73d76bd1fdf2d9333249f742ac02310a 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc-aarch64/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc-aarch64/spack.yaml
@@ -132,7 +132,7 @@ spack:
     - - $target
 
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/aws-isc-aarch64" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/aws-isc-aarch64" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
index 0a898d1a752b3764417fc08789ea822aafeaf326..db709b1f609cb3d0a88c0e84aef421201023dd23 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
@@ -143,7 +143,7 @@ spack:
     - - $target
 
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/aws-isc" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/aws-isc" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
index 78a3ea785c827d3b526b2bb5a70f65abaa86a154..e2e0bff1157d59c1821a5aabbcc19adf24908a27 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
@@ -21,7 +21,7 @@ spack:
         - - $default_specs
         - - $arch
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/build_systems" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/build_systems" }
 
   cdash:
     build-group: Build Systems
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
index 178ada4ee5b219e298ff2150aa3c5394b89cd739..3f0f759eaccfc669ba25bbae8ae82fa97ad36e33 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
@@ -64,7 +64,7 @@ spack:
       - [$sdk_base_spec]
       - [$^visit_specs]
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/data-vis-sdk" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/data-vis-sdk" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/deprecated/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/deprecated/spack.yaml
index 0c6bf0b05baad51db95ad55d83603c1e94d0b19f..a0b0fc502b01390480a265ff00ed8d45ce864e1c 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/deprecated/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/deprecated/spack.yaml
@@ -21,7 +21,7 @@ spack:
   - readline
 
   mirrors:
-    mirror: s3://spack-binaries/develop/deprecated
+    mirror: s3://spack-binaries/releases/v0.20/deprecated
   gitlab-ci:
     broken-tests-packages:
     - gptune
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-mac/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-mac/spack.yaml
index 88b081d2ebc2f680f31714e01fb33f5a016d2985..c9fcdf6c319a550da513f599529bd06179effe4b 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-mac/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-mac/spack.yaml
@@ -24,7 +24,7 @@ spack:
     - - $easy_specs
     - - $arch
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/e4s-mac" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/e4s-mac" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
index b2dcb5ad14180bd8f1025036ed1cfce32f08d6c8..0f8868f7e08a777f487ccd1106d3dddf99c62b76 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
@@ -263,7 +263,7 @@ spack:
   # SKIPPED
   # - flecsi                                # dependency pfunit marks oneapi as an unsupported compiler
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/e4s-oneapi" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/e4s-oneapi" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-power/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-power/spack.yaml
index d7a11d46e32ef357a9a9b434d2c28a7e4a8768a8..ba42c8f9b04c2b7aba7902223b933f2d0216cd0b 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-power/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-power/spack.yaml
@@ -207,7 +207,7 @@ spack:
   # bricks: VSBrick-7pt.py-Scalar-8x8x8-1:30:3: error: 'vfloat512' was not declared in this scope
 
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/e4s-power" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/e4s-power" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
index 393539ee12ae242c2acef223fe672b3185dbc051..504190d8e2412ee91546fdfb6b626acafb342ee1 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
@@ -232,7 +232,7 @@ spack:
   # CUDA failures
   #- parsec +cuda                 # parsec/mca/device/cuda/transfer.c:168: multiple definition of `parsec_CUDA_d2h_max_flows';
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/e4s" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/e4s" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/gpu-tests/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/gpu-tests/spack.yaml
index bb7c35063c7eba8050735cce4e27dd5d661d9795..5b944c62c6efa95c107a989d078984cc514604ca 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/gpu-tests/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/gpu-tests/spack.yaml
@@ -51,7 +51,7 @@ spack:
   # FAILURES
   # - kokkos +wrapper +cuda cuda_arch=80 ^cuda@12.0.0     # https://github.com/spack/spack/issues/35378
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/gpu-tests" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/gpu-tests" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cpu/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cpu/spack.yaml
index d244499fec0eacab7acf9f8329af08a4ac80f669..73765aff3085ac9601c5ce9d9fda89bece8bc1a9 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cpu/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cpu/spack.yaml
@@ -77,7 +77,7 @@ spack:
     - xgboost
 
   mirrors:
-    mirror: s3://spack-binaries/develop/ml-linux-x86_64-cpu
+    mirror: s3://spack-binaries/releases/v0.20/ml-linux-x86_64-cpu
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cuda/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cuda/spack.yaml
index 4cb711402d47de082d34b1765d45e5d0d4c36494..fe94e4af87ef7424886d2bf1970c42702be397eb 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cuda/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-cuda/spack.yaml
@@ -80,7 +80,7 @@ spack:
     - xgboost
 
   mirrors:
-    mirror: s3://spack-binaries/develop/ml-linux-x86_64-cuda
+    mirror: s3://spack-binaries/releases/v0.20/ml-linux-x86_64-cuda
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-rocm/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-rocm/spack.yaml
index 38b141c9b357adc725de2d997738eff0eebc8a46..85e7604f4f25c47d69d1832a081702dc6b8678d7 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-rocm/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-linux-x86_64-rocm/spack.yaml
@@ -83,7 +83,7 @@ spack:
     - xgboost
 
   mirrors:
-    mirror: s3://spack-binaries/develop/ml-linux-x86_64-rocm
+    mirror: s3://spack-binaries/releases/v0.20/ml-linux-x86_64-rocm
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws-aarch64/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws-aarch64/spack.yaml
index b05b45f76378cf35908a9f60761a0365aa3e9bd7..ead02ff5cae2e250feca9308527d494f9199cb58 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws-aarch64/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws-aarch64/spack.yaml
@@ -38,7 +38,7 @@ spack:
     - - $compiler
     - - $target
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/radiuss-aws-aarch64" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/radiuss-aws-aarch64" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
index fd297ede91049ac2a87bfff984984b13e7e44cfc..e7830ce8d7783e6db6d709a35f0f94f7fcd9b015 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
@@ -44,7 +44,7 @@ spack:
     - - $compiler
     - - $target
 
-  mirrors: { "mirror": "s3://spack-binaries/develop/radiuss-aws" }
+  mirrors: { "mirror": "s3://spack-binaries/releases/v0.20/radiuss-aws" }
 
   ci:
     pipeline-gen:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
index c80bcf10eed975b87b90b17b179bf8ebe05c0b72..bec6ea9e432c8443735efaa63c23b301f2a54275 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
@@ -41,7 +41,7 @@ spack:
       - zfp
 
   mirrors:
-    mirror: "s3://spack-binaries/develop/radiuss"
+    mirror: "s3://spack-binaries/releases/v0.20/radiuss"
 
   specs:
   - matrix:
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
index 4b39be884612f8bb98bebffda8a201d81e355297..657d73b1264d57bd85a90705303c0c7fe925b54f 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
@@ -50,7 +50,7 @@ spack:
   - $gcc_spack_built_packages
 
   mirrors:
-    mirror: s3://spack-binaries/develop/tutorial
+    mirror: s3://spack-binaries/releases/v0.20/tutorial
   ci:
     pipeline-gen:
     - build-job: