diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 8997e50879..d54dee58df 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-middlewareVersion = "v0.40.0-rc2"
+middlewareVersion = "v0.40.0-rc4"
 kotlinVersion = '2.0.21'
 kspVersion = "2.0.21-1.0.25"
 
diff --git a/protocol/src/main/proto/commands.proto b/protocol/src/main/proto/commands.proto
index 8ce5aed3d7..09f77d872b 100644
--- a/protocol/src/main/proto/commands.proto
+++ b/protocol/src/main/proto/commands.proto
@@ -543,6 +543,7 @@ message Rpc {
             message Request {
                 option (no_auth) = true;
                 string rootPath = 1; // Path to a wallet directory
+                string fulltextPrimaryLanguage = 2; // optional, default fts language
             }
 
             /**
@@ -577,6 +578,7 @@ message Rpc {
 
                 string rootPath = 1; // Path to a wallet directory
                 string mnemonic = 2; // Mnemonic of a wallet to recover
+                string fulltextPrimaryLanguage = 3; // optional, default fts language
             }
 
             /**
@@ -817,6 +819,7 @@ message Rpc {
                 option (no_auth) = true;
                 string id = 1; // Id of a selected account
                 string rootPath = 2;
+                string fulltextPrimaryLanguage = 3; // optional, default fts language
             }
 
             message Response {
@@ -874,6 +877,7 @@ message Rpc {
                 string networkCustomConfigFilePath = 5; // config path for the custom network mode
                 bool preferYamuxTransport = 6; // optional, default is false, recommended in case of problems with QUIC transport
                 string jsonApiListenAddr = 7; // optional, if empty json api will not be started; 127.0.0.1:31009 should be the default one
+                string fulltextPrimaryLanguage = 8; // optional, default fts language
             }
 
             /**
@@ -1042,6 +1046,7 @@ message Rpc {
                 string path = 1;
                 string rootPath = 2;
                 int64 icon = 3;
+                string fulltextPrimaryLanguage = 4; // optional, default fts language
             }
 
             message Response {
diff --git a/protocol/src/main/proto/events.proto b/protocol/src/main/proto/events.proto
index d2f121ac90..a5b5820be8 100644
--- a/protocol/src/main/proto/events.proto
+++ b/protocol/src/main/proto/events.proto
@@ -732,7 +732,7 @@ message Event {
                 FaviconHash faviconHash = 6;
                 Type type = 7;
                 TargetObjectId targetObjectId = 8;
-                
+
 
                 message Url {
                     string value = 1;