diff --git a/Makefile b/Makefile
index dcb37dc6..92aeaa62 100644
--- a/Makefile
+++ b/Makefile
@@ -130,9 +130,9 @@ SETUP_SCRIPT=tests/scripts/setup-supernodes.sh
 # Install Lumera
 # Optional: specify lumera binary path to skip download
 LUMERAD_BINARY ?=
-# Derive default Lumera version from go.mod (strip pseudo-version suffix if present)
-LUMERA_DEFAULT_VERSION := $(shell awk '/github.com\/LumeraProtocol\/lumera[[:space:]]+v/ {print $$2; exit}' go.mod | sed 's/-.*//')
-# Optional: specify installation mode (latest-release, latest-tag, or vX.Y.Z)
+# Derive default Lumera version from go.mod
+LUMERA_DEFAULT_VERSION := $(shell awk '/github.com\/LumeraProtocol\/lumera[[:space:]]+v/ {print $$2; exit}' go.mod)
+# Optional: specify installation mode (latest-release, latest-tag, or vX.Y.Z[...])
 INSTALL_MODE ?= $(if $(LUMERA_DEFAULT_VERSION),$(LUMERA_DEFAULT_VERSION),latest-release)
 
 install-lumera:
@@ -192,4 +192,4 @@ release:
 	git tag $(NEXT_TAG)
 	git push upstream $(NEXT_TAG)
 	
-	@echo "Release complete: $(NEXT_TAG) pushed to upstream"
+	@echo "Release complete: $(NEXT_TAG) pushed to upstream"
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 6c842cca..ae837e25 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	cosmossdk.io/math v1.5.3
 	github.com/AlecAivazis/survey/v2 v2.3.7
 	github.com/DataDog/zstd v1.5.7
-	github.com/LumeraProtocol/lumera v1.8.5
+	github.com/LumeraProtocol/lumera v1.8.6-rc2
 	github.com/LumeraProtocol/rq-go v0.2.1
 	github.com/btcsuite/btcutil v1.0.3-0.20201208143702-a53e38424cce
 	github.com/cenkalti/backoff/v4 v4.3.0
diff --git a/go.sum b/go.sum
index 1dfe6235..ab08b5ae 100644
--- a/go.sum
+++ b/go.sum
@@ -76,8 +76,8 @@ github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.50
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0 h1:ig/FpDD2JofP/NExKQUbn7uOSZzJAQqogfqluZK4ed4=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0/go.mod h1:otE2jQekW/PqXk1Awf5lmfokJx4uwuqcj1ab5SpGeW0=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/LumeraProtocol/lumera v1.8.5 h1:VfRm9bEWYehd7Ek6YJFdQBFXH47SCuDO6IFdzq3y5+g=
-github.com/LumeraProtocol/lumera v1.8.5/go.mod h1:DcG+PermGhl5uA51VaSA0EC+FXpDVm2XgifmYL9jJvE=
+github.com/LumeraProtocol/lumera v1.8.6-rc2 h1:o4f3HOpmpk6VU+PiFOExx6F6doffLCKJUcDQzQ59TbE=
+github.com/LumeraProtocol/lumera v1.8.6-rc2/go.mod h1:DcG+PermGhl5uA51VaSA0EC+FXpDVm2XgifmYL9jJvE=
 github.com/LumeraProtocol/rq-go v0.2.1 h1:8B3UzRChLsGMmvZ+UVbJsJj6JZzL9P9iYxbdUwGsQI4=
 github.com/LumeraProtocol/rq-go v0.2.1/go.mod h1:APnKCZRh1Es2Vtrd2w4kCLgAyaL5Bqrkz/BURoRJ+O8=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
diff --git a/pkg/lumera/Readme.md b/pkg/lumera/Readme.md
index 4c33b34f..b25d43f3 100644
--- a/pkg/lumera/Readme.md
+++ b/pkg/lumera/Readme.md
@@ -53,6 +53,7 @@ resp, err := cli.ActionMsg().RequestAction(
   metadataJSON,              // stringified JSON
   "23800ulume",             // positive integer ulume amount
   fmt.Sprintf("%d", time.Now().Add(25*time.Hour).Unix()), // future expiry
+  "0",                      // fileSizeKbs (KiB; 0 if unknown)
 )
 ```
 
@@ -68,6 +69,7 @@ Validation rules (built-in)
   - `actionType`, `metadata`, `price`, `expirationTime` required.
   - `price`: must be `<positive-int>ulume`.
   - `expirationTime`: future Unix seconds.
+  - `fileSizeKbs`: optional; if set, must be integer `>= 0`.
 - FinalizeCascadeAction:
   - `actionId` required; `rqIdsIds` must have non-empty entries.
 
diff --git a/pkg/lumera/modules/action_msg/action_msg_mock.go b/pkg/lumera/modules/action_msg/action_msg_mock.go
index c0d74bea..b8a3f46e 100644
--- a/pkg/lumera/modules/action_msg/action_msg_mock.go
+++ b/pkg/lumera/modules/action_msg/action_msg_mock.go
@@ -57,18 +57,18 @@ func (mr *MockModuleMockRecorder) FinalizeCascadeAction(ctx, actionId, rqIdsIds
 }
 
 // RequestAction mocks base method.
-func (m *MockModule) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime string) (*tx.BroadcastTxResponse, error) {
+func (m *MockModule) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime, fileSizeKbs string) (*tx.BroadcastTxResponse, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "RequestAction", ctx, actionType, metadata, price, expirationTime)
+	ret := m.ctrl.Call(m, "RequestAction", ctx, actionType, metadata, price, expirationTime, fileSizeKbs)
 	ret0, _ := ret[0].(*tx.BroadcastTxResponse)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
 // RequestAction indicates an expected call of RequestAction.
-func (mr *MockModuleMockRecorder) RequestAction(ctx, actionType, metadata, price, expirationTime any) *gomock.Call {
+func (mr *MockModuleMockRecorder) RequestAction(ctx, actionType, metadata, price, expirationTime, fileSizeKbs any) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RequestAction", reflect.TypeOf((*MockModule)(nil).RequestAction), ctx, actionType, metadata, price, expirationTime)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RequestAction", reflect.TypeOf((*MockModule)(nil).RequestAction), ctx, actionType, metadata, price, expirationTime, fileSizeKbs)
 }
 
 // SimulateFinalizeCascadeAction mocks base method.
diff --git a/pkg/lumera/modules/action_msg/helpers.go b/pkg/lumera/modules/action_msg/helpers.go
index a1fb7e71..0ba722e0 100644
--- a/pkg/lumera/modules/action_msg/helpers.go
+++ b/pkg/lumera/modules/action_msg/helpers.go
@@ -10,7 +10,7 @@ import (
 	"github.com/LumeraProtocol/supernode/v2/pkg/lumera/util"
 )
 
-func validateRequestActionParams(actionType, metadata, price, expirationTime string) error {
+func validateRequestActionParams(actionType, metadata, price, expirationTime, fileSizeKbs string) error {
 	if actionType == "" {
 		return fmt.Errorf("action type cannot be empty")
 	}
@@ -36,6 +36,15 @@ func validateRequestActionParams(actionType, metadata, price, expirationTime str
 	if exp <= time.Now().Add(30*time.Second).Unix() {
 		return fmt.Errorf("expiration time must be in the future")
 	}
+	if fileSizeKbs != "" {
+		parsed, err := strconv.ParseInt(fileSizeKbs, 10, 64)
+		if err != nil {
+			return fmt.Errorf("invalid fileSizeKbs: %w", err)
+		}
+		if parsed < 0 {
+			return fmt.Errorf("fileSizeKbs must be >= 0")
+		}
+	}
 	return nil
 }
 
@@ -54,13 +63,14 @@ func validateFinalizeActionParams(actionId string, rqIdsIds []string) error {
 	return nil
 }
 
-func createRequestActionMessage(creator, actionType, metadata, price, expirationTime string) *actiontypes.MsgRequestAction {
+func createRequestActionMessage(creator, actionType, metadata, price, expirationTime, fileSizeKbs string) *actiontypes.MsgRequestAction {
 	return &actiontypes.MsgRequestAction{
 		Creator:        creator,
 		ActionType:     actionType,
 		Metadata:       metadata,
 		Price:          price,
 		ExpirationTime: expirationTime,
+		FileSizeKbs:    fileSizeKbs,
 	}
 }
 
diff --git a/pkg/lumera/modules/action_msg/impl.go b/pkg/lumera/modules/action_msg/impl.go
index 804fcb88..8e282225 100644
--- a/pkg/lumera/modules/action_msg/impl.go
+++ b/pkg/lumera/modules/action_msg/impl.go
@@ -46,8 +46,8 @@ func newModule(conn *grpc.ClientConn, authmodule auth.Module, txmodule txmod.Mod
 	}, nil
 }
 
-func (m *module) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime string) (*sdktx.BroadcastTxResponse, error) {
-	if err := validateRequestActionParams(actionType, metadata, price, expirationTime); err != nil {
+func (m *module) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime, fileSizeKbs string) (*sdktx.BroadcastTxResponse, error) {
+	if err := validateRequestActionParams(actionType, metadata, price, expirationTime, fileSizeKbs); err != nil {
 		return nil, err
 	}
 
@@ -55,7 +55,7 @@ func (m *module) RequestAction(ctx context.Context, actionType, metadata, price,
 	defer m.mu.Unlock()
 
 	return m.txHelper.ExecuteTransaction(ctx, func(creator string) (types.Msg, error) {
-		return createRequestActionMessage(creator, actionType, metadata, price, expirationTime), nil
+		return createRequestActionMessage(creator, actionType, metadata, price, expirationTime, fileSizeKbs), nil
 	})
 }
 
diff --git a/pkg/lumera/modules/action_msg/interface.go b/pkg/lumera/modules/action_msg/interface.go
index f45af851..82652bd8 100644
--- a/pkg/lumera/modules/action_msg/interface.go
+++ b/pkg/lumera/modules/action_msg/interface.go
@@ -13,7 +13,7 @@ import (
 
 type Module interface {
 	// FinalizeCascadeAction finalizes a CASCADE action with the given parameters
-	RequestAction(ctx context.Context, actionType, metadata, price, expirationTime string) (*sdktx.BroadcastTxResponse, error)
+	RequestAction(ctx context.Context, actionType, metadata, price, expirationTime, fileSizeKbs string) (*sdktx.BroadcastTxResponse, error)
 	FinalizeCascadeAction(ctx context.Context, actionId string, rqIdsIds []string) (*sdktx.BroadcastTxResponse, error)
 	// SimulateFinalizeCascadeAction simulates the finalize action (no broadcast)
 	SimulateFinalizeCascadeAction(ctx context.Context, actionId string, rqIdsIds []string) (*sdktx.SimulateResponse, error)
diff --git a/pkg/testutil/lumera.go b/pkg/testutil/lumera.go
index 20596b85..4258599a 100644
--- a/pkg/testutil/lumera.go
+++ b/pkg/testutil/lumera.go
@@ -143,7 +143,7 @@ func (m *MockActionModule) GetParams(ctx context.Context) (*types.QueryParamsRes
 type MockActionMsgModule struct{}
 
 // RequestAction mocks the behavior of requesting an action.
-func (m *MockActionMsgModule) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime string) (*sdktx.BroadcastTxResponse, error) {
+func (m *MockActionMsgModule) RequestAction(ctx context.Context, actionType, metadata, price, expirationTime, fileSizeKbs string) (*sdktx.BroadcastTxResponse, error) {
 	// Mock implementation returns success with empty result
 	return &sdktx.BroadcastTxResponse{}, nil
 }
diff --git a/sdk/README.md b/sdk/README.md
index c79db01e..5eeb12de 100644
--- a/sdk/README.md
+++ b/sdk/README.md
@@ -16,7 +16,7 @@ Under the hood: encodes file to a single‑block layout, signs layout/index (cre
 2) Submit RequestAction (via pkg/lumera)
 ```
 b, _ := json.Marshal(meta)
-resp, err := lumeraClient.ActionMsg().RequestAction(ctx, "CASCADE", string(b), price, expiration)
+resp, err := lumeraClient.ActionMsg().RequestAction(ctx, "CASCADE", string(b), price, expiration, "0")
 if err != nil { /* handle */ }
 // Extract actionID from tx events or query later
 ```
diff --git a/sdk/adapters/lumera/adapter.go b/sdk/adapters/lumera/adapter.go
index 57c00b7e..8137a4b9 100644
--- a/sdk/adapters/lumera/adapter.go
+++ b/sdk/adapters/lumera/adapter.go
@@ -376,6 +376,7 @@ func toSdkAction(resp *actiontypes.QueryGetActionResponse) Action {
 		State:          ACTION_STATE(resp.Action.State.String()),
 		Height:         resp.Action.BlockHeight,
 		ExpirationTime: resp.Action.ExpirationTime,
+		FileSizeKbs:    resp.Action.FileSizeKbs,
 		ActionType:     resp.Action.ActionType.String(),
 		Metadata:       resp.Action.Metadata,
 		Creator:        resp.Action.Creator,
diff --git a/sdk/adapters/lumera/types.go b/sdk/adapters/lumera/types.go
index 300510eb..238a9e77 100644
--- a/sdk/adapters/lumera/types.go
+++ b/sdk/adapters/lumera/types.go
@@ -29,6 +29,7 @@ type Action struct {
 	State          ACTION_STATE
 	Height         int64
 	ExpirationTime int64
+	FileSizeKbs    int64
 	ActionType     string // Type of the action (e.g., CASCADE)
 	Metadata       []byte // Raw metadata bytes
 	Creator        string // Creator of the action
diff --git a/tests/scripts/install-lumera.sh b/tests/scripts/install-lumera.sh
index 594a6ef6..d11a450a 100755
--- a/tests/scripts/install-lumera.sh
+++ b/tests/scripts/install-lumera.sh
@@ -42,7 +42,7 @@ if [ "$MODE" == "latest-tag" ]; then
     if command -v jq >/dev/null 2>&1; then
         TAG_NAME=$(curl -s "$GITHUB_API/tags" | jq -r '.[0].name')
         DOWNLOAD_URL=$(curl -s "$GITHUB_API/releases/tags/$TAG_NAME" \
-            | jq -r '.assets[] | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
+            | jq -r '.assets[]? | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
     else
         TAG_NAME=$(curl -s "$GITHUB_API/tags" | grep '"name"' | head -n 1 | sed -E 's/.*"([^"]+)".*/\1/')
         DOWNLOAD_URL=$(curl -s "$GITHUB_API/releases/tags/$TAG_NAME" \
@@ -50,11 +50,11 @@ if [ "$MODE" == "latest-tag" ]; then
             | sed 's/.*"browser_download_url"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/')
     fi
 
-elif [[ "$MODE" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+elif [[ "$MODE" =~ ^v[0-9]+\.[0-9]+\.[0-9]+.*$ ]]; then
     TAG_NAME="$MODE"
     if command -v jq >/dev/null 2>&1; then
         DOWNLOAD_URL=$(curl -s "$GITHUB_API/releases/tags/$TAG_NAME" \
-            | jq -r '.assets[] | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
+            | jq -r '.assets[]? | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
     else
         DOWNLOAD_URL=$(curl -s "$GITHUB_API/releases/tags/$TAG_NAME" \
             | grep -o '"browser_download_url"[[:space:]]*:[[:space:]]*"[^"]*linux_amd64\.tar\.gz[^"]*"' \
@@ -67,7 +67,7 @@ elif [ "$MODE" == "latest-release" ]; then
     # Extract tag name and download URL
     if command -v jq >/dev/null 2>&1; then
         TAG_NAME=$(echo "$RELEASE_INFO" | jq -r '.tag_name')
-        DOWNLOAD_URL=$(echo "$RELEASE_INFO" | jq -r '.assets[] | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
+        DOWNLOAD_URL=$(echo "$RELEASE_INFO" | jq -r '.assets[]? | select(.name | test("linux_amd64.tar.gz$")) | .browser_download_url')
     else
         TAG_NAME=$(echo "$RELEASE_INFO" | grep -o '"tag_name"[[:space:]]*:[[:space:]]*"[^"]*"' | sed 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/')
         DOWNLOAD_URL=$(echo "$RELEASE_INFO" | grep -o '"browser_download_url"[[:space:]]*:[[:space:]]*"[^"]*linux_amd64\.tar\.gz[^"]*"' | sed 's/.*"browser_download_url"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/')
@@ -114,4 +114,4 @@ fi
 
 # Clean up
 cd "$ORIG_DIR"
-rm -rf "$TEMP_DIR"
+rm -rf "$TEMP_DIR"
\ No newline at end of file
diff --git a/tests/system/e2e_cascade_test.go b/tests/system/e2e_cascade_test.go
index 41ed525a..89274e33 100644
--- a/tests/system/e2e_cascade_test.go
+++ b/tests/system/e2e_cascade_test.go
@@ -9,6 +9,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -297,7 +298,14 @@ func TestCascadeE2E(t *testing.T) {
 	t.Logf("Requesting cascade action with metadata: %s", metadata)
 	t.Logf("Action type: %s, Price: %s, Expiration: %s", actionType, autoPrice, expirationTime)
 
-	response, err := lumeraClinet.ActionMsg().RequestAction(ctx, actionType, metadata, autoPrice, expirationTime)
+	fi, err := os.Stat(testFileFullpath)
+	require.NoError(t, err, "Failed to stat test file")
+	fileSizeKbs := int64(0)
+	if fi != nil && fi.Size() > 0 {
+		fileSizeKbs = (fi.Size() + 1023) / 1024
+	}
+
+	response, err := lumeraClinet.ActionMsg().RequestAction(ctx, actionType, metadata, autoPrice, expirationTime, strconv.FormatInt(fileSizeKbs, 10))
 	require.NoError(t, err, "RequestAction failed")
 
 	require.NotNil(t, resp, "RequestAction returned nil response")
diff --git a/tests/system/go.mod b/tests/system/go.mod
index 4fac1d6a..e220e08c 100644
--- a/tests/system/go.mod
+++ b/tests/system/go.mod
@@ -54,7 +54,7 @@ require (
 	github.com/99designs/keyring v1.2.2 // indirect
 	github.com/DataDog/datadog-go v4.8.3+incompatible // indirect
 	github.com/DataDog/zstd v1.5.7 // indirect
-	github.com/LumeraProtocol/lumera v1.8.4 // indirect
+	github.com/LumeraProtocol/lumera v1.8.6-rc2 // indirect
 	github.com/LumeraProtocol/rq-go v0.2.1 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
diff --git a/tests/system/go.sum b/tests/system/go.sum
index 9e5e89ad..59e6866c 100644
--- a/tests/system/go.sum
+++ b/tests/system/go.sum
@@ -72,8 +72,8 @@ github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.50
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0 h1:ig/FpDD2JofP/NExKQUbn7uOSZzJAQqogfqluZK4ed4=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0/go.mod h1:otE2jQekW/PqXk1Awf5lmfokJx4uwuqcj1ab5SpGeW0=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/LumeraProtocol/lumera v1.8.4 h1:6XzLS9gd0m3lOnppNS05WuZx4VCBEGvUN/KpVkSjqro=
-github.com/LumeraProtocol/lumera v1.8.4/go.mod h1:twrSLfuXcHvmfQoN5e02Bg7rfeevUjF34SVqEJIvH1E=
+github.com/LumeraProtocol/lumera v1.8.6-rc2 h1:o4f3HOpmpk6VU+PiFOExx6F6doffLCKJUcDQzQ59TbE=
+github.com/LumeraProtocol/lumera v1.8.6-rc2/go.mod h1:DcG+PermGhl5uA51VaSA0EC+FXpDVm2XgifmYL9jJvE=
 github.com/LumeraProtocol/rq-go v0.2.1 h1:8B3UzRChLsGMmvZ+UVbJsJj6JZzL9P9iYxbdUwGsQI4=
 github.com/LumeraProtocol/rq-go v0.2.1/go.mod h1:APnKCZRh1Es2Vtrd2w4kCLgAyaL5Bqrkz/BURoRJ+O8=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=