diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 06ae52e..be3729e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     with:
       yaml-files: |
         Integrations/ESPHome/CAST-1.yaml
-      # dev excluded until the TemplateSelect .state incompatibility is fixed
       esphome-versions: |
         stable
         beta
+        dev
diff --git a/Integrations/ESPHome/Core.yaml b/Integrations/ESPHome/Core.yaml
index 7ddfcc8..5243f92 100644
--- a/Integrations/ESPHome/Core.yaml
+++ b/Integrations/ESPHome/Core.yaml
@@ -1,5 +1,5 @@
 substitutions:
-  version: "26.8.28.1"
+  version: "26.9.21.1"
   stable_manifest_base: "https://apolloautomation.github.io/CAST-1"
   beta_manifest_base: "https://github.com/ApolloAutomation/CAST-1/releases/download/beta-fw"
   stable_manifest_dir: "firmware"
@@ -221,7 +221,7 @@ esp32:
     type: esp-idf
     version: recommended
     sdkconfig_options:
-      CONFIG_ESP32S3_DATA_CACHE_64KB: "y"
+      CONFIG_ESP32S3_DATA_CACHE_32KB: "y"
       CONFIG_ESP32S3_DATA_CACHE_LINE_64B: "y"
       CONFIG_ESP32S3_INSTRUCTION_CACHE_32KB: "y"
 
@@ -696,10 +696,10 @@ script:
     then:
       - lambda: |-
           const bool beta = id(firmware_channel).current_option() == "Beta";
-          std::string url = beta
+          const char *url = beta
             ? "${beta_manifest_base}/${beta_manifest_file}"
             : "${stable_manifest_base}/${stable_manifest_dir}/manifest.json";
-          ESP_LOGI("firmware", "OTA manifest set to: %s", url.c_str());
+          ESP_LOGI("firmware", "OTA manifest set to: %s", url);
           id(update_http_request).set_source_url(url);
       - component.update: update_http_request
   - id: statusCheck