diff --git a/README.md b/README.md
index 2f823ead..66d1926c 100644
--- a/README.md
+++ b/README.md
@@ -216,7 +216,7 @@ It is also possible to flash it via the web tools which might be more convenient
 Once you have your OpenDTU running and connected to WLAN, you can do further updates through the web interface.
 Navigate to Settings --> Firmware upgrade and press the browse button. Select the firmware file from your local computer.
 
-You'll find the firmware file (after a successfull build process) under `.pio/build/generic/firmware.bin`.
+You'll find the firmware file (after a successful build process) under `.pio/build/generic/firmware.bin`.
 
 If you downloaded a precompiled zip archive, unpack it and choose `opendtu-generic.bin`.
 
diff --git a/lib/Hoymiles/src/HoymilesRadio.cpp b/lib/Hoymiles/src/HoymilesRadio.cpp
index 7a463b6b..af85b8d9 100644
--- a/lib/Hoymiles/src/HoymilesRadio.cpp
+++ b/lib/Hoymiles/src/HoymilesRadio.cpp
@@ -25,7 +25,7 @@ void HoymilesRadio::init(SPIClass* initialisedSpiBus, uint8_t pinCE, uint8_t pin
     _radio->setRetries(0, 0);
     _radio->maskIRQ(true, true, false); // enable only receiving interrupts
     if (_radio->isChipConnected()) {
-        Hoymiles.getMessageOutput()->println(F("Connection successfull"));
+        Hoymiles.getMessageOutput()->println(F("Connection successful"));
     } else {
         Hoymiles.getMessageOutput()->println(F("Connection error!!"));
     }
@@ -121,7 +121,7 @@ void HoymilesRadio::loop()
                 sendRetransmitPacket(verifyResult);
 
             } else {
-                // Successfull received all packages
+                // Successful received all packages
                 Hoymiles.getMessageOutput()->println(F("Success"));
                 _commandQueue.pop();
                 _busyFlag = false;
diff --git a/src/WebApi_security.cpp b/src/WebApi_security.cpp
index 91f09279..7df629f8 100644
--- a/src/WebApi_security.cpp
+++ b/src/WebApi_security.cpp
@@ -120,7 +120,7 @@ void WebApiSecurityClass::onAuthenticateGet(AsyncWebServerRequest* request)
     AsyncJsonResponse* response = new AsyncJsonResponse();
     JsonObject retMsg = response->getRoot();
     retMsg[F("type")] = F("success");
-    retMsg[F("message")] = F("Authentication successfull!");
+    retMsg[F("message")] = F("Authentication successful!");
     retMsg[F("code")] = WebApiError::SecurityAuthSuccess;
 
     response->setLength();
diff --git a/webapp/src/locales/en.json b/webapp/src/locales/en.json
index a0a3ff00..ed689a8e 100644
--- a/webapp/src/locales/en.json
+++ b/webapp/src/locales/en.json
@@ -86,7 +86,7 @@
         "9009": "Second must be a number between {min} and {max}!",
         "9010": "Time updated!",
         "10001": "Password must between 8 and {max} characters long!",
-        "10002": "Authentication successfull!",
+        "10002": "Authentication successful!",
         "11001": "@:apiresponse.2001",
         "11002": "@:apiresponse:5004",
         "12001": "Profil must between 1 and {max} characters long!"
diff --git a/webapp/src/views/ConsoleInfoView.vue b/webapp/src/views/ConsoleInfoView.vue
index 3ccf4cdf..54820ca9 100644
--- a/webapp/src/views/ConsoleInfoView.vue
+++ b/webapp/src/views/ConsoleInfoView.vue
@@ -87,7 +87,7 @@ export default defineComponent({
 
             this.socket.onopen = function (event) {
                 console.log(event);
-                console.log("Successfully connected to the echo websocket server...");
+                console.log("Successfuly connected to the echo websocket server...");
             };
 
             // Listen to window events , When the window closes , Take the initiative to disconnect websocket Connect
diff --git a/webapp/src/views/HomeView.vue b/webapp/src/views/HomeView.vue
index 0ccbcdf2..0dce4f13 100644
--- a/webapp/src/views/HomeView.vue
+++ b/webapp/src/views/HomeView.vue
@@ -489,7 +489,7 @@ export default defineComponent({
 
             this.socket.onopen = function (event) {
                 console.log(event);
-                console.log("Successfully connected to the echo websocket server...");
+                console.log("Successfuly connected to the echo websocket server...");
             };
 
             // Listen to window events , When the window closes , Take the initiative to disconnect websocket Connect