diff --git a/esphome/components/async_tcp/__init__.py b/esphome/components/async_tcp/__init__.py
index 8af33bc4ef..b2307d5a7b 100644
--- a/esphome/components/async_tcp/__init__.py
+++ b/esphome/components/async_tcp/__init__.py
@@ -12,4 +12,4 @@ def to_code(config):
         cg.add_library('AsyncTCP-esphome', '1.1.1')
     elif CORE.is_esp8266:
         # https://github.com/OttoWinter/ESPAsyncTCP
-        cg.add_library('ESPAsyncTCP-esphome', '1.2.2')
+        cg.add_library('ESPAsyncTCP-esphome', '1.2.3')
diff --git a/platformio.ini b/platformio.ini
index e3f3de808c..557803bb29 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -16,7 +16,7 @@ lib_deps =
     ESPAsyncWebServer-esphome@1.2.7
     FastLED@3.3.2
     NeoPixelBus-esphome@2.5.7
-    ESPAsyncTCP-esphome@1.2.2
+    ESPAsyncTCP-esphome@1.2.3
     1655@1.0.2  ; TinyGPSPlus (has name conflict)
     6865@1.0.0  ; TM1651 Battery Display
     6306@1.0.3  ; HM3301