diff --git a/checkout-versions.yaml b/checkout-versions.yaml
index 1c1a90643..516a4fd9a 100644
--- a/checkout-versions.yaml
+++ b/checkout-versions.yaml
@@ -4,5 +4,5 @@
 # SPDX-License-Identifier: Apache-2.0
 versions:
   ramble: 100f97d  # develop on 04/25/2026 (newer than 0.6.0 release)
-  spack: a85ec51  # Dec. 1 2025 v1.1.0
+  spack: dc375fd  # develop on May 5 2026
   spack-packages: 661ecf6  # Jun 1 2026