diff --git a/README.md b/README.md
index ec680f9..de5a7ab 100644
--- a/README.md
+++ b/README.md
@@ -13,4 +13,5 @@ Implemented from [Client-Server API](https://matrix.org/docs/spec/client_server/
 - [x] [5.4.1 GET /_matrix/client/r0/login](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-login)
 - [x] [5.4.2 POST /_matrix/client/r0/login](https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-login)
 - [x] [5.4.3 POST /_matrix/client/r0/logout](https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-logout)
-- [x] [5.7.1 GET /_matrix/client/r0/account/whoami](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-account-whoami)
\ No newline at end of file
+- [x] [5.4.4 POST /_matrix/client/r0/logout/all](https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-logout-all)
+- [x] [5.7.1 GET /_matrix/client/r0/account/whoami](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-account-whoami)
diff --git a/internal/backend.go b/internal/backend.go
index 0e8dbe0..57652be 100644
--- a/internal/backend.go
+++ b/internal/backend.go
@@ -33,4 +33,5 @@ type User interface {
 	LeaveRoom(room Room) *models.ApiError
 	SetTopic(room Room, topic string) *models.ApiError
 	SendMessage(room Room, text string) *models.ApiError
+	LogoutAll()
 }
diff --git a/internal/backends/memory/user.go b/internal/backends/memory/user.go
index 25dfe79..aa1bc66 100644
--- a/internal/backends/memory/user.go
+++ b/internal/backends/memory/user.go
@@ -154,3 +154,7 @@ func (user *User) SendMessage(room internal.Room, text string) *models.ApiError
 
 	return nil
 }
+
+func (user *User) LogoutAll() {
+	user.Tokens = make(map[string]Token)
+}
diff --git a/internal/handlers.go b/internal/handlers.go
index 2872685..ab7ce00 100644
--- a/internal/handlers.go
+++ b/internal/handlers.go
@@ -97,6 +97,31 @@ func LogoutHandler(w http.ResponseWriter, r *http.Request) {
 	sendJsonResponse(w, http.StatusOK, struct{}{})
 }
 
+// https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-logout-all
+func LogoutAllHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		errorResponse(w, models.M_UNKNOWN, http.StatusBadRequest, "wrong method: "+r.Method)
+		return
+	}
+
+	token := getTokenFromResponse(r)
+
+	if token == "" {
+		errorResponse(w, models.M_MISSING_TOKEN, http.StatusBadRequest, "")
+		return
+	}
+
+	user := currServer.Backend.GetUserByToken(token)
+	if user == nil {
+		errorResponse(w, models.M_UNKNOWN_TOKEN, http.StatusBadRequest, "")
+		return
+	}
+
+	user.LogoutAll()
+
+	sendJsonResponse(w, http.StatusOK, struct{}{})
+}
+
 // https://models.org/docs/spec/client_server/latest#post-models-client-r0-register
 func RegisterHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
diff --git a/internal/server.go b/internal/server.go
index 3f208de..1b02c67 100644
--- a/internal/server.go
+++ b/internal/server.go
@@ -21,6 +21,7 @@ func New() *Server {
 	router.HandleFunc("/_matrix/client/versions", VersionHandler)
 	router.HandleFunc("/_matrix/client/r0/login", LoginHandler)
 	router.HandleFunc("/_matrix/client/r0/logout", LogoutHandler)
+	router.HandleFunc("/_matrix/client/r0/logout/all", LogoutAllHandler)
 	router.HandleFunc("/_matrix/client/r0/register", RegisterHandler)
 	router.HandleFunc("/_matrix/client/r0/account/whoami", WhoAmIHandler)
 	router.HandleFunc("/_matrix/client/r0/sync", SyncHandler)