diff --git a/esphome/config_validation.py b/esphome/config_validation.py
index c04d43bbee..0eebf12e66 100644
--- a/esphome/config_validation.py
+++ b/esphome/config_validation.py
@@ -2331,13 +2331,13 @@ def _validate_no_slash(value):
     the visually similar Unicode FRACTION SLASH (U+2044) character.
     """
     if "/" in value:
-        # Remove before 2026.7.0
+        # Remove before 2027.7.0
         new_value = value.replace("/", FRACTION_SLASH)
         _LOGGER.warning(
             "'%s' contains '/' which is reserved as a URL path separator. "
             "Automatically replacing with '%s' (Unicode FRACTION SLASH). "
             "Please update your configuration. "
-            "This will become an error in ESPHome 2026.7.0.",
+            "This will become an error in ESPHome 2027.7.0.",
             value,
             new_value,
         )
diff --git a/tests/unit_tests/test_config_validation.py b/tests/unit_tests/test_config_validation.py
index 4a4e37e5c4..7627ef9273 100644
--- a/tests/unit_tests/test_config_validation.py
+++ b/tests/unit_tests/test_config_validation.py
@@ -932,7 +932,7 @@ def test_string_no_slash__slash_replaced_with_warning(
     actual = cv.string_no_slash(value)
     assert actual == expected
     assert "reserved as a URL path separator" in caplog.text
-    assert "will become an error in ESPHome 2026.7.0" in caplog.text
+    assert "will become an error in ESPHome 2027.7.0" in caplog.text
 
 
 def test_string_no_slash__long_string_allowed() -> None: