diff --git a/esphome/components/sha256/__init__.py b/esphome/components/sha256/__init__.py
index 045cbbe37e..91d4929a4f 100644
--- a/esphome/components/sha256/__init__.py
+++ b/esphome/components/sha256/__init__.py
@@ -2,6 +2,7 @@ import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.core import CORE
 from esphome.helpers import IS_MACOS
+from esphome.types import ConfigType
 
 CODEOWNERS = ["@esphome/core"]
 
@@ -10,7 +11,7 @@ sha256_ns = cg.esphome_ns.namespace("sha256")
 CONFIG_SCHEMA = cv.Schema({})
 
 
-async def to_code(config):
+async def to_code(config: ConfigType) -> None:
     # Add OpenSSL library for host platform
     if CORE.is_host:
         if IS_MACOS: