diff --git a/scripts/cluster/bootstrap-platform.sh b/scripts/cluster/bootstrap-platform.sh
index d226660..4f26d7e 100755
--- a/scripts/cluster/bootstrap-platform.sh
+++ b/scripts/cluster/bootstrap-platform.sh
@@ -46,20 +46,22 @@ source "$postgres_environment"
   exit 1
 }
 
-declare -A operator_urls=(
-  [cert-manager.yaml]=https://github.com/cert-manager/cert-manager/releases/download/v1.21.0/cert-manager.yaml
-  [cnpg.yaml]=https://raw.githubusercontent.com/cloudnative-pg/cloudnative-pg/release-1.29/releases/cnpg-1.29.1.yaml
-  [barman.yaml]=https://github.com/cloudnative-pg/plugin-barman-cloud/releases/download/v0.13.0/manifest.yaml
+operators=(cert-manager.yaml cnpg.yaml barman.yaml)
+operator_urls=(
+  https://github.com/cert-manager/cert-manager/releases/download/v1.21.0/cert-manager.yaml
+  https://raw.githubusercontent.com/cloudnative-pg/cloudnative-pg/release-1.29/releases/cnpg-1.29.1.yaml
+  https://github.com/cloudnative-pg/plugin-barman-cloud/releases/download/v0.13.0/manifest.yaml
 )
-declare -A operator_checksums=(
-  [cert-manager.yaml]=6e499c3f1ab356abe79a7853911f80cb09c213885bfdf81092fdff142ba63c4a
-  [cnpg.yaml]=e0c5ff41bf5b01c0775bf225929b8423d543cd23e9742e4274fe7de8499cf93a
-  [barman.yaml]=d2e71e7b06822448f1a421f05781846cfdb9cc621e7ef32eef5e20c5133213b0
+operator_checksums=(
+  6e499c3f1ab356abe79a7853911f80cb09c213885bfdf81092fdff142ba63c4a
+  e0c5ff41bf5b01c0775bf225929b8423d543cd23e9742e4274fe7de8499cf93a
+  d2e71e7b06822448f1a421f05781846cfdb9cc621e7ef32eef5e20c5133213b0
 )
-for operator in cert-manager.yaml cnpg.yaml barman.yaml; do
-  curl -fsSL "${operator_urls[$operator]}" -o "$working_directory/$operator"
+for index in 0 1 2; do
+  operator=${operators[$index]}
+  curl -fsSL "${operator_urls[$index]}" -o "$working_directory/$operator"
   actual_checksum=$(shasum -a 256 "$working_directory/$operator" | awk '{print $1}')
-  [[ $actual_checksum == "${operator_checksums[$operator]}" ]] || {
+  [[ $actual_checksum == "${operator_checksums[$index]}" ]] || {
     echo "operator manifest checksum mismatch: $operator" >&2
     exit 1
   }