diff --git a/README.md b/README.md
index c58ec53..1fd599d 100644
--- a/README.md
+++ b/README.md
@@ -78,8 +78,7 @@ amaru run \
   --network "$AMARU_NETWORK" \
   --ledger-dir /srv/amaru/ledger.$AMARU_NETWORK.db \
   --chain-dir /srv/amaru/chain.$AMARU_NETWORK.db \
-  --era-history-file /amaru-runtime/era-history.json \
-  --global-parameters-file /amaru-runtime/global-parameters.json \
+  --era-history /amaru-runtime/era-history.json \
   --peer-address "$AMARU_PEER"
 ```
 
@@ -87,9 +86,10 @@ The `amaru-runtime/` directory is part of the deployment contract. It
 must contain:
 
 - `era-history.json`: the custom testnet era history passed to
-  `--era-history-file`.
-- `global-parameters.json`: the custom testnet consensus parameters
-  passed to `--global-parameters-file`.
+  `--era-history`.
+- `global-parameters.json`: the custom testnet consensus parameters,
+  exported by the relay as `AMARU_GLOBAL_*` overrides for `amaru run`
+  (see `amaru run --help-global-parameters`).
 
 ## Published images
 
diff --git a/docs/antithesis.md b/docs/antithesis.md
index 239d7e9..e257083 100644
--- a/docs/antithesis.md
+++ b/docs/antithesis.md
@@ -145,8 +145,8 @@ relay entrypoint reads them from `/amaru-runtime` by default:
 It passes them directly to Amaru:
 
 ```text
---era-history-file /amaru-runtime/era-history.json
---global-parameters-file /amaru-runtime/global-parameters.json
+--era-history /amaru-runtime/era-history.json
+# global-parameters.json is exported as AMARU_GLOBAL_* (amaru run --help-global-parameters)
 ```
 
 Keep these files aligned with the `testnet.yaml` and genesis files used
diff --git a/docs/architecture.md b/docs/architecture.md
index 1449543..88bd2c9 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -154,8 +154,8 @@ stateDiagram-v2
 The relay passes deployment-provided runtime JSON to `amaru run`:
 
 ```text
---era-history-file /amaru-runtime/era-history.json
---global-parameters-file /amaru-runtime/global-parameters.json
+--era-history /amaru-runtime/era-history.json
+# global-parameters.json is exported as AMARU_GLOBAL_* (amaru run --help-global-parameters)
 ```
 
 These files must match the custom testnet genesis/config used by the
diff --git a/docs/tutorial.md b/docs/tutorial.md
index 1f5247c..354ab20 100644
--- a/docs/tutorial.md
+++ b/docs/tutorial.md
@@ -44,8 +44,8 @@ testnets/cardano_amaru_epoch360/
 The relay entrypoint passes these files to `amaru run` with:
 
 ```text
---era-history-file /amaru-runtime/era-history.json
---global-parameters-file /amaru-runtime/global-parameters.json
+--era-history /amaru-runtime/era-history.json
+# global-parameters.json is exported as AMARU_GLOBAL_* (amaru run --help-global-parameters)
 ```
 
 Keep them aligned with the genesis/config emitted by the cardano-node
diff --git a/flake.lock b/flake.lock
index cd56c04..61ac73a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -36,11 +36,11 @@
     "amaru": {
       "flake": false,
       "locked": {
-        "lastModified": 1781023476,
-        "narHash": "sha256-fVxIU4kiMVyRMj3jzcO5Uqhey5rFEkIx8nGSauWmCfk=",
+        "lastModified": 1781285605,
+        "narHash": "sha256-aVzUcJEbn4e0ucS5EZV+867osDm4lIjOnvHoZe36Axo=",
         "owner": "lambdasistemi",
         "repo": "amaru",
-        "rev": "731b39837235178eb183f1b185c5800d8c22e44b",
+        "rev": "74ffb873ab776921f79b7da6ad1b52b31dbc3e42",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 757fc33..42af9c3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,7 +58,7 @@
     # flake.lock per constitution Principle III. Pinned to feat/testnet-bootstrap:
     # upstream pragma-org/amaru main plus a minimal, upstreamable delta —
     # create-snapshots --targets-file/--cardano-db-dir (offline/testnet snapshots),
-    # runtime --era-history-file/--global-parameters-file, the testnet tvar
+    # runtime --era-history + AMARU_GLOBAL_* overrides, the testnet tvar
     # era-history sidecar fix, and short-epoch ledger/consensus guards.
     amaru = {
       url = "github:lambdasistemi/amaru/feat/testnet-bootstrap";
diff --git a/nix/checks.nix b/nix/checks.nix
index 52988f8..ec7925d 100644
--- a/nix/checks.nix
+++ b/nix/checks.nix
@@ -400,7 +400,7 @@ in
       test -d "$final/chain.testnet_42.db"
       # nonces + bootstrap headers are baked into chain.<net>.db by
       # `amaru bootstrap`; the bundle ships the era-history override for
-      # `amaru run --era-history-file` at consume time.
+      # `amaru run --era-history` at consume time.
       test -f "$final/era-history.json"
       test -d "$final/ledger.testnet_42.db/live"
       snapshot_count=0
@@ -474,7 +474,7 @@ in
   # (epochLength=120) boundary end-to-end: the producer builds a bundle
   # via create-snapshots + bootstrap, then `amaru run` must open it and
   # stay alive. The custom epoch length is supplied at runtime via
-  # --era-history-file (the network built-in is 86400), so this is the
+  # --era-history (the network built-in is 86400), so this is the
   # gate for the runtime-testnet-parameters + short-epoch ledger fixes.
   antithesis-short-epoch-golden =
     pkgs.runCommand "antithesis-short-epoch-golden"
@@ -495,7 +495,7 @@ in
       set +e
       timeout 30s amaru --with-json-traces run \
         --network testnet_42 \
-        --era-history-file $TMPDIR/testnet_42/era-history.json \
+        --era-history $TMPDIR/testnet_42/era-history.json \
         --ledger-dir $TMPDIR/testnet_42/ledger.testnet_42.db \
         --chain-dir $TMPDIR/testnet_42/chain.testnet_42.db \
         --listen-address 127.0.0.1:0 \
diff --git a/scripts/amaru-relay-bootstrap.sh b/scripts/amaru-relay-bootstrap.sh
index 5a95088..5e435d3 100755
--- a/scripts/amaru-relay-bootstrap.sh
+++ b/scripts/amaru-relay-bootstrap.sh
@@ -220,10 +220,25 @@ done
 # the indexer sees it directly with no further wrapping.
 log "bundle ready at $final, exec'ing amaru run"
 export AMARU_LOG
+
+# amaru no longer accepts --global-parameters-file: for a Testnet network the
+# global parameters come from individual AMARU_GLOBAL_* cli/env overrides
+# (see `amaru run --help-global-parameters`), falling back to the network
+# built-in otherwise. Convert the custom testnet's global-parameters.json into
+# those env vars; field names map 1:1 to AMARU_GLOBAL_<UPPER>
+# (e.g. consensus_security_param -> AMARU_GLOBAL_CONSENSUS_SECURITY_PARAM).
+if [[ -f "$runtime/global-parameters.json" ]]; then
+  while IFS='=' read -r _k _v; do
+    [[ -n "$_k" ]] && export "AMARU_GLOBAL_${_k}=${_v}"
+  done < <(jq -r 'to_entries[] | "\(.key | ascii_upcase)=\(.value)"' "$runtime/global-parameters.json")
+  log "exported AMARU_GLOBAL_* overrides from $runtime/global-parameters.json"
+else
+  log "WARNING: $runtime/global-parameters.json not found; using network-default global parameters"
+fi
+
 exec "$AMARU_BIN" run \
   --network "$AMARU_NETWORK" \
   --ledger-dir "$final/ledger.$AMARU_NETWORK.db" \
   --chain-dir "$final/chain.$AMARU_NETWORK.db" \
-  --era-history-file "$runtime/era-history.json" \
-  --global-parameters-file "$runtime/global-parameters.json" \
+  --era-history "$runtime/era-history.json" \
   --peer-address "$AMARU_PEER"
diff --git a/scripts/bootstrap-producer.sh b/scripts/bootstrap-producer.sh
index 86e73b3..67f5ffb 100755
--- a/scripts/bootstrap-producer.sh
+++ b/scripts/bootstrap-producer.sh
@@ -111,7 +111,7 @@ tail_phase_log() {
 ## amaru `bootstrap` consumes this per-snapshot sidecar for custom
 ## testnets (make_era_history reads history.<slot>.<hash>.json next to
 ## the snapshot dir); the same document is shipped at the bundle root
-## as era-history.json so `amaru run --era-history-file` can override
+## as era-history.json so `amaru run --era-history` can override
 ## the network default at consume time. Without it amaru defaults to
 ## the built-in testnet era-history (epoch_size 86400) and treats every
 ## short-epoch slot as still-in-epoch-0, producing wrong nonces. See
@@ -434,8 +434,8 @@ phase_targets() {
 
 # Step 3: amaru create-snapshots. rc=6 on failure.
 # Drives the db-analyser engine against the local chain DB
-# (--cardano-db-dir, so Mithril is skipped) using the explicit targets
-# (--targets-file, so Koios is skipped). Materializes one snapshot dir
+# (--cardano-node-db, so Mithril is skipped) using the explicit snapshot
+# points (--snapshot, so Koios is skipped). Materializes one snapshot dir
 # per epoch under snapshots/<net>/<slot>.<hash>/ with packaged bootstrap
 # headers, plus epoch metadata under data/<net>/epoch-snapshots/epochs/.
 phase_create_snapshots() {
@@ -453,13 +453,24 @@ phase_create_snapshots() {
     ln -sfn "${CHAIN_DB}/immutable" "${cardano_db}/immutable"
 
     local rc=0
-    printf '+ amaru create-snapshots (epoch %d + 2)\n' "${first_epoch}"
+    # amaru >= 4de2db13 replaced --targets-file with a repeated
+    # --snapshot "<point>::<parent_point>" option (Point = "<slot>.<hash>"); three
+    # snapshot points, derived from the targets already computed above.
+    local -a snapshot_args=()
+    while IFS= read -r _snap; do snapshot_args+=("${_snap}"); done < <(
+        jq -r '.[] | "--snapshot", "\(.slot).\(.hash)::\(.parent_point)"' "${UNIQUE_TMP}/targets.json"
+    )
+    # amaru >= 4de2db13 treats --epoch as the TARGET epoch (Amaru's start point),
+    # expanding to the 3 prior snapshots (T-3,T-2,T-1). Our snapshots are the 3
+    # latest completed epochs [first_epoch .. first_epoch+2], so target = first_epoch+3.
+    local target_epoch=$(( first_epoch + 3 ))
+    printf '+ amaru create-snapshots (target epoch %d, snapshots %d..%d)\n' "${target_epoch}" "${first_epoch}" "$(( first_epoch + 2 ))"
     log_phase create-snapshots amaru create-snapshots \
         --network "${NETWORK}" \
-        --epoch "${first_epoch}" \
+        --epoch "${target_epoch}" \
         --cardano-node-config-dir "${CONFIG_DIR}" \
-        --cardano-db-dir "${cardano_db}" \
-        --targets-file "${UNIQUE_TMP}/targets.json" \
+        --cardano-node-db "${cardano_db}" \
+        "${snapshot_args[@]}" \
         --snapshot-dir "${snap_root}" \
         --dist-dir "${dist_dir}" \
         || rc=$?
@@ -483,7 +494,7 @@ phase_create_snapshots() {
 # Step 4: era-history sidecars + bundle era-history.json. rc=6 on failure.
 # amaru `bootstrap` reads history.<slot>.<hash>.json alongside each
 # snapshot dir for custom testnets (make_era_history); `amaru run` later
-# reads era-history.json from the bundle root via --era-history-file.
+# reads era-history.json from the bundle root via --era-history.
 phase_era_sidecars() {
     local snap_root="${UNIQUE_TMP}/snapshots/${NET_LC}"
     local slot hash count=0
@@ -499,7 +510,7 @@ phase_era_sidecars() {
         printf 'no era-history sidecars written\n' >&2
         exit 6
     fi
-    # Bundle-level copy for `amaru run --era-history-file` at consume time.
+    # Bundle-level copy for `amaru run --era-history` at consume time.
     ensure_era_history_input "${UNIQUE_TMP}/era-history.json"
 }
 
@@ -525,7 +536,7 @@ phase_bootstrap() {
         AMARU_BOOTSTRAP_CONFIG_DIR="${UNIQUE_TMP}/bootstrap-config" \
             amaru bootstrap \
                 --network "${NETWORK}" \
-                --epoch "${first_epoch}" \
+                --epoch "$(( first_epoch + 3 ))" \
                 --ledger-dir "${ledger_dir}" \
                 --chain-dir "${chain_dir}"
     ) 2>"${logdir}/bootstrap.stderr" || rc=$?
diff --git a/tests/lib/bootstrap-helpers.bash b/tests/lib/bootstrap-helpers.bash
index e3147cf..2f116c7 100644
--- a/tests/lib/bootstrap-helpers.bash
+++ b/tests/lib/bootstrap-helpers.bash
@@ -264,10 +264,14 @@ start_amaru_run() {
 
   local extra=()
   if [[ -f "$bundle/era-history.json" ]]; then
-    extra+=(--era-history-file "$bundle/era-history.json")
+    extra+=(--era-history "$bundle/era-history.json")
   fi
+  # amaru replaced --global-parameters-file with individual AMARU_GLOBAL_*
+  # cli/env overrides; mirror the relay entrypoint by exporting them.
   if [[ -f "$bundle/global-parameters.json" ]]; then
-    extra+=(--global-parameters-file "$bundle/global-parameters.json")
+    while IFS='=' read -r _k _v; do
+      [[ -n "$_k" ]] && export "AMARU_GLOBAL_${_k}=${_v}"
+    done < <(jq -r 'to_entries[] | "\(.key | ascii_upcase)=\(.value)"' "$bundle/global-parameters.json")
   fi
 
   amaru --with-json-traces run \
diff --git a/tests/test-bootstrap-producer-history.bats b/tests/test-bootstrap-producer-history.bats
index 21a8f9a..ced5f1f 100644
--- a/tests/test-bootstrap-producer-history.bats
+++ b/tests/test-bootstrap-producer-history.bats
@@ -74,23 +74,24 @@ cmd="\$1"
 shift
 case "\$cmd" in
   create-snapshots)
-    targets=""
     snapdir=""
+    points=()
     while [[ \$# -gt 0 ]]; do
       case "\$1" in
-        --targets-file) targets="\$2"; shift 2 ;;
+        --snapshot) points+=("\$2"); shift 2 ;;
         --snapshot-dir) snapdir="\$2"; shift 2 ;;
         *) shift ;;
       esac
     done
     mkdir -p "\$snapdir"
-    while IFS=\$'\t' read -r slot hash; do
-      d="\$snapdir/\$slot.\$hash"
+    for p in "\${points[@]}"; do
+      point="\${p%%::*}"
+      d="\$snapdir/\$point"
       mkdir -p "\$d/tables"
       : >"\$d/state"
       : >"\$d/tables/tvar"
       printf '[]\n' >"\$d/bootstrap.headers.json"
-    done < <(jq -r '.[] | "\(.slot)\t\(.hash)"' "\$targets")
+    done
     ;;
   bootstrap)
     ledger=""
diff --git a/tests/test-bootstrap-producer-sparse-boundaries.bats b/tests/test-bootstrap-producer-sparse-boundaries.bats
index ddf43dd..e344b26 100644
--- a/tests/test-bootstrap-producer-sparse-boundaries.bats
+++ b/tests/test-bootstrap-producer-sparse-boundaries.bats
@@ -53,22 +53,23 @@ EOF
 cmd="$1"; shift
 case "$cmd" in
   create-snapshots)
-    targets=""; snapdir=""
+    snapdir=""; points=()
     while [ "$#" -gt 0 ]; do
       case "$1" in
-        --targets-file) targets="$2"; shift 2 ;;
+        --snapshot) points+=("$2"); shift 2 ;;
         --snapshot-dir) snapdir="$2"; shift 2 ;;
         *) shift ;;
       esac
     done
     mkdir -p "$snapdir"
-    while IFS=$'\t' read -r slot hash; do
-      d="$snapdir/$slot.$hash"
+    for p in "${points[@]}"; do
+      point="${p%%::*}"
+      d="$snapdir/$point"
       mkdir -p "$d/tables"
       : >"$d/state"
       : >"$d/tables/tvar"
       printf '[]\n' >"$d/bootstrap.headers.json"
-    done < <(jq -r '.[] | "\(.slot)\t\(.hash)"' "$targets")
+    done
     ;;
   bootstrap)
     ledger=""; chain=""