diff --git a/CHANGELOG.md b/CHANGELOG.md
index b872203..03a1a47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 dev:
  
+1.39.1:
+ - refactor sync committee to use slot endpoint rather than epoch query param
+
 1.39.0:
  - support Fulu 
 
diff --git a/cmd/synccommittee/members/process.go b/cmd/synccommittee/members/process.go
index 06fc0bf..6d8c2ad 100644
--- a/cmd/synccommittee/members/process.go
+++ b/cmd/synccommittee/members/process.go
@@ -35,9 +35,13 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		return nil, err
 	}
 
+	state := "head"
+	if data.epoch != "" {
+		slot := data.chainTime.FirstSlotOfEpoch(epoch)
+		state = fmt.Sprintf("%d", slot)
+	}
 	syncCommitteeResponse, err := data.eth2Client.(eth2client.SyncCommitteesProvider).SyncCommittee(ctx, &api.SyncCommitteeOpts{
-		State: "head",
-		Epoch: &epoch,
+		State: state,
 	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain sync committee information")
diff --git a/cmd/version.go b/cmd/version.go
index f37f5c1..5b60fc4 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -24,7 +24,7 @@ import (
 
 // ReleaseVersion is the release version of the codebase.
 // Usually overridden by tag names when building binaries.
-var ReleaseVersion = "local build (latest release 1.39.0)"
+var ReleaseVersion = "local build (latest release 1.39.1)"
 
 // versionCmd represents the version command.
 var versionCmd = &cobra.Command{