diff --git a/src/client.ts b/src/client.ts
index 5bc6ab071..85a4e84f8 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -4292,13 +4292,11 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
             signPromise = this.http.requestOtherUrl<IThirdPartySigned>(Method.Post, url);
         }
 
-        let queryParams: QueryDict = {};
+        const queryParams: QueryDict = {};
         if (opts.viaServers) {
+            // server_name has been deprecated in favour of via with Matrix >1.11 (MSC4156)
             queryParams.server_name = opts.viaServers;
             queryParams.via = opts.viaServers;
-            if (this.canSupport.get(Feature.MigrateServerNameToVia) === ServerSupport.Unstable) {
-                queryParams = replaceParam("via", "org.matrix.msc4156.via", queryParams);
-            }
         }
 
         const data: IJoinRequestBody = {};
@@ -4341,13 +4339,11 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
 
         const path = utils.encodeUri("/knock/$roomIdOrAlias", { $roomIdOrAlias: roomIdOrAlias });
 
-        let queryParams: QueryDict = {};
+        const queryParams: QueryDict = {};
         if (opts.viaServers) {
+            // server_name has been deprecated in favour of via with Matrix >1.11 (MSC4156)
             queryParams.server_name = opts.viaServers;
             queryParams.via = opts.viaServers;
-            if (this.canSupport.get(Feature.MigrateServerNameToVia) === ServerSupport.Unstable) {
-                queryParams = replaceParam("via", "org.matrix.msc4156.via", queryParams);
-            }
         }
 
         const body: Record<string, string> = {};
diff --git a/src/feature.ts b/src/feature.ts
index 47c914353..fc0976763 100644
--- a/src/feature.ts
+++ b/src/feature.ts
@@ -33,7 +33,6 @@ export enum Feature {
     AccountDataDeletion = "AccountDataDeletion",
     RelationsRecursion = "RelationsRecursion",
     IntentionalMentions = "IntentionalMentions",
-    MigrateServerNameToVia = "MigrateServerNameToVia",
 }
 
 type FeatureSupportCondition = {
@@ -66,9 +65,6 @@ const featureSupportResolver: Record<string, FeatureSupportCondition> = {
         unstablePrefixes: ["org.matrix.msc3952_intentional_mentions"],
         matrixVersion: "v1.7",
     },
-    [Feature.MigrateServerNameToVia]: {
-        unstablePrefixes: ["org.matrix.msc4156"],
-    },
 };
 
 export async function buildFeatureSupportMap(versions: IServerVersions): Promise<Map<Feature, ServerSupport>> {