diff --git a/requirements.txt b/requirements.txt
index 2e6268284a0..be3445dceb0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ tzlocal==5.3.1    # from time
 tzdata>=2021.1  # from time
 pyserial==3.5
 platformio==6.1.19
-esptool==5.1.0
+esptool==5.2.0
 click==8.1.7
 esphome-dashboard==20260210.0
 aioesphomeapi==44.0.0
diff --git a/tests/components/esp32_ble_server/common.yaml b/tests/components/esp32_ble_server/common.yaml
index e9576a8262c..7fe0b2eb5f1 100644
--- a/tests/components/esp32_ble_server/common.yaml
+++ b/tests/components/esp32_ble_server/common.yaml
@@ -33,6 +33,10 @@ esp32_ble_server:
     - uuid: 2a24b789-7a1b-4535-af3e-ee76a35cc42d
       advertise: false
       characteristics:
+        - id: test_lambda_characteristic
+          uuid: 2a24b789-7a1b-4535-af3e-ee76a35cc12c
+          read: true
+          value: !lambda return { 1, 2 };
         - id: test_change_characteristic
           uuid: 2a24b789-7a1b-4535-af3e-ee76a35cc11c
           read: true