diff --git a/chain.go b/chain.go
index 2099e5a..b75578a 100644
--- a/chain.go
+++ b/chain.go
@@ -6,12 +6,13 @@ import (
 	"runtime/debug"
 	"strings"
 
+	"github.com/streamingfast/substreams/wasm"
+
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	pbbstream "github.com/streamingfast/bstream/pb/sf/bstream/v1"
 	"github.com/streamingfast/firehose-core/node-manager/mindreader"
 	"github.com/streamingfast/firehose-core/node-manager/operator"
-	"github.com/streamingfast/firehose-core/substreams"
 	"github.com/streamingfast/logging"
 	"go.uber.org/multierr"
 	"go.uber.org/zap"
@@ -150,7 +151,7 @@ type Chain[B Block] struct {
 	//
 	BlockEncoder BlockEncoder
 
-	RegisterSubstreamsExtensions func(chain *Chain[B]) ([]substreams.Extension, error)
+	RegisterSubstreamsExtensions func() (wasm.WASMExtensioner, error)
 }
 
 type ToolsConfig[B Block] struct {
diff --git a/cmd/apps/substreams_common.go b/cmd/apps/substreams_common.go
index 409d477..2f02f3d 100644
--- a/cmd/apps/substreams_common.go
+++ b/cmd/apps/substreams_common.go
@@ -1,13 +1,9 @@
 package apps
 
 import (
-	"fmt"
 	"sync"
 
 	"github.com/spf13/cobra"
-	firecore "github.com/streamingfast/firehose-core"
-	"github.com/streamingfast/substreams/pipeline"
-	"github.com/streamingfast/substreams/wasm"
 )
 
 var registerSSOnce sync.Once
@@ -19,22 +15,3 @@ func registerCommonSubstreamsFlags(cmd *cobra.Command) {
 		cmd.Flags().String("substreams-state-store-default-tag", "", "If non-empty, will be appended to {substreams-state-store-url} (ex: 'v1'). Can be overriden per-request with 'X-Sf-Substreams-Cache-Tag' header")
 	})
 }
-
-func getSubstreamsExtensions[B firecore.Block](chain *firecore.Chain[B]) ([]wasm.WASMExtensioner, []pipeline.PipelineOptioner, error) {
-	var wasmExtensions []wasm.WASMExtensioner
-	var pipelineOptions []pipeline.PipelineOptioner
-
-	if chain.RegisterSubstreamsExtensions != nil {
-		extensions, err := chain.RegisterSubstreamsExtensions(chain)
-		if err != nil {
-			return nil, nil, fmt.Errorf("register substreams extensions failed: %w", err)
-		}
-
-		for _, extension := range extensions {
-			wasmExtensions = append(wasmExtensions, extension.WASMExtensioner)
-			pipelineOptions = append(pipelineOptions, extension.PipelineOptioner)
-		}
-	}
-
-	return wasmExtensions, pipelineOptions, nil
-}
diff --git a/cmd/apps/substreams_tier1.go b/cmd/apps/substreams_tier1.go
index bd3acf0..ceb4550 100644
--- a/cmd/apps/substreams_tier1.go
+++ b/cmd/apps/substreams_tier1.go
@@ -97,7 +97,7 @@ func RegisterSubstreamsTier1App[B firecore.Block](chain *firecore.Chain[B], root
 				}
 			}
 
-			wasmExtensions, pipelineOptioner, err := getSubstreamsExtensions(chain)
+			wasmExtensions, err := chain.RegisterSubstreamsExtensions()
 			if err != nil {
 				return nil, fmt.Errorf("substreams extensions: %w", err)
 			}
@@ -117,8 +117,7 @@ func RegisterSubstreamsTier1App[B firecore.Block](chain *firecore.Chain[B], root
 					SubrequestsInsecure:  subrequestsInsecure,
 					SubrequestsPlaintext: subrequestsPlaintext,
 
-					WASMExtensions:  wasmExtensions,
-					PipelineOptions: pipelineOptioner,
+					WASMExtensions: wasmExtensions,
 
 					Tracing: tracing,
 
diff --git a/go.mod b/go.mod
index f801903..0820f11 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module github.com/streamingfast/firehose-core
 
 go 1.22
 
+replace github.com/streamingfast/substreams => github.com/streamingfast/substreams v1.4.1-0.20240326144332-9f8e91e85d39
+
 require (
 	buf.build/gen/go/bufbuild/reflect/connectrpc/go v1.12.0-20230822193137-310c9c4845dd.1
 	buf.build/gen/go/bufbuild/reflect/protocolbuffers/go v1.31.0-20230822193137-310c9c4845dd.2
diff --git a/go.sum b/go.sum
index 6b6f419..155c057 100644
--- a/go.sum
+++ b/go.sum
@@ -625,8 +625,8 @@ github.com/streamingfast/shutter v1.5.0 h1:NpzDYzj0HVpSiDJVO/FFSL6QIK/YKOxY0gJAt
 github.com/streamingfast/shutter v1.5.0/go.mod h1:B/T6efqdeMGbGwjzPS1ToXzYZI4kDzI5/u4I+7qbjY8=
 github.com/streamingfast/snapshotter v0.0.0-20230316190750-5bcadfde44d0 h1:Y15G1Z4fpEdm2b+/70owI7TLuXadlqBtGM7rk4Hxrzk=
 github.com/streamingfast/snapshotter v0.0.0-20230316190750-5bcadfde44d0/go.mod h1:/Rnz2TJvaShjUct0scZ9kKV2Jr9/+KBAoWy4UMYxgv4=
-github.com/streamingfast/substreams v1.4.1-0.20240326143310-a4878081f44c h1:rr6W9hiYdC+Jf4KcW1zggAU50jZc01dYtNpUlyMDnaY=
-github.com/streamingfast/substreams v1.4.1-0.20240326143310-a4878081f44c/go.mod h1:tS03mbQ14PcuqmQCKvj82yENHaMl2xKxUBvWHJT06QQ=
+github.com/streamingfast/substreams v1.4.1-0.20240326144332-9f8e91e85d39 h1:pIcLENGVftM7G7KZ+dH/fIZGJ/fLDiSKn4mmS34u9jw=
+github.com/streamingfast/substreams v1.4.1-0.20240326144332-9f8e91e85d39/go.mod h1:tS03mbQ14PcuqmQCKvj82yENHaMl2xKxUBvWHJT06QQ=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
diff --git a/substreams/extentions.go b/substreams/extentions.go
deleted file mode 100644
index 73198b2..0000000
--- a/substreams/extentions.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package substreams
-
-import (
-	"github.com/streamingfast/substreams/pipeline"
-	"github.com/streamingfast/substreams/wasm"
-)
-
-type Extension struct {
-	PipelineOptioner pipeline.PipelineOptioner
-	WASMExtensioner  wasm.WASMExtensioner
-}