diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57df4e03f..e1eadf147 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Performance
 
+- Improving the latency of the `HeyGenVideoService`.
+
 - Improved some frame processors performance by using the new frame processor
   direct mode. In direct mode a frame processor will process frames right away
   avoiding the need for internal queues and tasks. This is useful for some
@@ -46,7 +48,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Other
 
-- Improving the latency of the `HeyGenVideoService`.
+- Added foundational example `15a-switch-languages.py` to release evals. It is
+  able to detect if we switched the language properly.
 
 - Updated foundational examples to show how to enclose complex logic
   (e.g. `ParallelPipeline`) into a single processor so the main pipeline becomes
diff --git a/scripts/evals/eval.py b/scripts/evals/eval.py
index f4518d7ce..c12f75fa5 100644
--- a/scripts/evals/eval.py
+++ b/scripts/evals/eval.py
@@ -210,7 +210,10 @@ async def run_eval_pipeline(
     # 5" (in audio) this can be converted to "32 is 5".
     stt = DeepgramSTTService(
         api_key=os.getenv("DEEPGRAM_API_KEY"),
-        live_options=LiveOptions(smart_format=False),
+        live_options=LiveOptions(
+            language="multi",
+            smart_format=False,
+        ),
     )
 
     tts = CartesiaTTSService(
diff --git a/scripts/evals/run-release-evals.py b/scripts/evals/run-release-evals.py
index 6b5bbcd25..5aac70c6b 100644
--- a/scripts/evals/run-release-evals.py
+++ b/scripts/evals/run-release-evals.py
@@ -35,6 +35,10 @@ EVAL_WEATHER = (
 PROMPT_ONLINE_SEARCH = "What's the date right now in London?"
 EVAL_ONLINE_SEARCH = f"Today is {datetime.now(timezone.utc).strftime('%B %d, %Y')}."
 
+# Switch language
+PROMPT_SWITCH_LANGUAGE = "Say something in Spanish."
+EVAL_SWITCH_LANGUAGE = "Check if the user is now talking in Spanish."
+
 TESTS_07 = [
     # 07 series
     ("07-interruptible.py", PROMPT_SIMPLE_MATH, None),
@@ -101,6 +105,10 @@ TESTS_14 = [
     # ("14o-function-calling-gemini-openai-format.py", PROMPT_WEATHER, EVAL_WEATHER),
 ]
 
+TESTS_15 = [
+    ("15a-switch-languages.py", PROMPT_SWITCH_LANGUAGE, EVAL_SWITCH_LANGUAGE),
+]
+
 TESTS_19 = [
     ("19-openai-realtime-beta.py", PROMPT_WEATHER, EVAL_WEATHER),
     ("19a-azure-realtime-beta.py", PROMPT_WEATHER, EVAL_WEATHER),
@@ -135,6 +143,7 @@ TESTS_43 = [
 TESTS = [
     *TESTS_07,
     *TESTS_14,
+    *TESTS_15,
     *TESTS_19,
     *TESTS_21,
     *TESTS_26,