diff --git a/splitio/commitversion.go b/splitio/commitversion.go
index ff47aa2b..0cd35ce1 100644
--- a/splitio/commitversion.go
+++ b/splitio/commitversion.go
@@ -5,4 +5,4 @@ This file is created automatically, please do not edit
 */
 
 // CommitVersion is the version of the last commit previous to release
-const CommitVersion = "8fd26d7"
+const CommitVersion = "4f19e34"
diff --git a/splitio/proxy/controllers/sdk_test.go b/splitio/proxy/controllers/sdk_test.go
index 78284069..1f454602 100644
--- a/splitio/proxy/controllers/sdk_test.go
+++ b/splitio/proxy/controllers/sdk_test.go
@@ -53,7 +53,7 @@ func TestSplitChangesImpressionsDisabled(t *testing.T) {
 		&rbsStorage,
 		flagsets.NewMatcher(false, nil),
 		&largeSegmentStorageMock,
-		specs.FLAG_V1_2,
+		specs.FLAG_V1_3,
 	)
 	controller.Register(group)
 
diff --git a/splitio/proxy/proxy.go b/splitio/proxy/proxy.go
index 8a76e94c..da56dc9a 100644
--- a/splitio/proxy/proxy.go
+++ b/splitio/proxy/proxy.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/splitio/split-synchronizer/v5/splitio"
 	"github.com/splitio/split-synchronizer/v5/splitio/common/impressionlistener"
 	"github.com/splitio/split-synchronizer/v5/splitio/proxy/controllers"
 	"github.com/splitio/split-synchronizer/v5/splitio/proxy/controllers/middleware"
@@ -145,6 +146,11 @@ func New(options *Options) *API {
 		cacheableRouter.Use(options.Cache.Handle)
 		cacheableRouter.Use(gzip.Gzip(gzip.DefaultCompression))
 	}
+	cacheableRouter.Use(func(c *gin.Context) {
+		c.Header("Harness-FME-Proxy-Version", splitio.Version)
+		c.Header("Harness-FME-FlagSpec", options.SpecVersion)
+		c.Next()
+	})
 	authController.Register(cacheableRouter)
 	sdkController.Register(cacheableRouter)
 	eventsController.Register(regular, beacon)
diff --git a/splitio/proxy/proxy_test.go b/splitio/proxy/proxy_test.go
index a2d63f97..bb39a674 100644
--- a/splitio/proxy/proxy_test.go
+++ b/splitio/proxy/proxy_test.go
@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/splitio/split-synchronizer/v5/splitio"
 	ilmock "github.com/splitio/split-synchronizer/v5/splitio/common/impressionlistener/mocks"
 	"github.com/splitio/split-synchronizer/v5/splitio/proxy/caching"
 	"github.com/splitio/split-synchronizer/v5/splitio/proxy/storage"
@@ -79,7 +80,8 @@ func TestSplitChangesEndpoints(t *testing.T) {
 	assert.Equal(t, "split2", changes.Splits[0].Name)
 	assert.False(t, changes.Splits[0].ImpressionsDisabled)
 	assert.Equal(t, "application/json; charset=utf-8", headers.Get("Content-Type"))
-
+	assert.Equal(t, opts.SpecVersion, headers.Get("Harness-FME-FlagSpec"))
+	assert.Equal(t, splitio.Version, headers.Get("Harness-FME-Proxy-Version"))
 }
 
 func TestSplitChangesWithFlagsetsCaching(t *testing.T) {
@@ -160,6 +162,8 @@ func TestSplitChangesWithFlagsetsCaching(t *testing.T) {
 	assert.Equal(t, int64(1), changes.Till)
 	assert.Equal(t, "split1", changes.Splits[0].Name)
 	assert.Equal(t, "application/json; charset=utf-8", headers.Get("Content-Type"))
+	assert.Equal(t, opts.SpecVersion, headers.Get("Harness-FME-FlagSpec"))
+	assert.Equal(t, splitio.Version, headers.Get("Harness-FME-Proxy-Version"))
 }
 
 func TestSegmentChangesAndMySegmentsEndpoints(t *testing.T) {
@@ -249,6 +253,8 @@ func TestSegmentChangesAndMySegmentsEndpoints(t *testing.T) {
 	assert.Equal(t, 200, status)
 	assert.Equal(t, []dtos.MySegmentDTO{}, segments)
 	assert.Equal(t, "application/json; charset=utf-8", headers.Get("Content-Type"))
+	assert.Equal(t, opts.SpecVersion, headers.Get("Harness-FME-FlagSpec"))
+	assert.Equal(t, splitio.Version, headers.Get("Harness-FME-Proxy-Version"))
 }
 
 func TestMembershipEndpoint(t *testing.T) {
@@ -284,6 +290,8 @@ func TestMembershipEndpoint(t *testing.T) {
 	assert.Equal(t, 200, status)
 	assert.Equal(t, expected, response)
 	assert.Equal(t, "application/json; charset=utf-8", headers.Get("Content-Type"))
+	assert.Equal(t, opts.SpecVersion, headers.Get("Harness-FME-FlagSpec"))
+	assert.Equal(t, splitio.Version, headers.Get("Harness-FME-Proxy-Version"))
 }
 
 func makeOpts() *Options {