diff --git a/spack.sh b/spack.sh
index 48c0c213b5d5dccf6d793d26d9ea1407a5f01e6e..464b4df66c6f414578dde35dd0ab0c9a212423f0 100644
--- a/spack.sh
+++ b/spack.sh
@@ -3,7 +3,7 @@ SPACK_ORGREPO="spack/spack"
 
 ## Spack github version, e.g. v0.18.1 or commit hash
 ## note: nightly builds will use e.g. releases/v0.19
-SPACK_VERSION="v0.23.1"
+SPACK_VERSION="develop"
 
 ## Space-separated list of spack cherry-picks
 read -r -d '' SPACK_CHERRYPICKS <<- \