diff --git a/binding/python/test_orca.py b/binding/python/test_orca.py
index ebed17ff..13cf2278 100644
--- a/binding/python/test_orca.py
+++ b/binding/python/test_orca.py
@@ -62,8 +62,8 @@ def _test_word_equal(self, word: Orca.WordAlignment, word_truth: Orca.WordAlignm
         self._test_equal_timestamp(word.start_sec, word_truth.start_sec)
         self._test_equal_timestamp(word.end_sec, word_truth.end_sec)
 
-        for i, phoneme in enumerate(word.phonemes):
-            phoneme_truth = word_truth.phonemes[i]
+        self.assertEqual(len(word.phonemes), len(word_truth.phonemes))
+        for phoneme, phoneme_truth in zip(word.phonemes, word_truth.phonemes):
             self._test_phoneme_equal(phoneme, phoneme_truth)
 
     @staticmethod
@@ -108,30 +108,31 @@ def test_synthesize_alignment_exact(self) -> None:
         pcm, alignments = orca.synthesize(test_data.text_alignment, random_state=test_data.random_state)
         self.assertGreater(len(pcm), 0)
 
-        for i, word in enumerate(alignments):
-            word_truth = test_data.alignments[i]
+        self.assertTrue(len(alignments) == len(test_data.alignments))
+        for word, word_truth in zip(alignments, test_data.alignments):
             self._test_word_equal(word, word_truth)
 
     def test_synthesize_alignment(self) -> None:
         for i, orca in enumerate(self.orcas):
-            if self.EXACT_ALIGNMENT_TEST_MODEL_IDENTIFIER not in self.model_paths[i]:
+            if self.EXACT_ALIGNMENT_TEST_MODEL_IDENTIFIER in self.model_paths[i]:
+                continue
 
-                pcm, alignments = orca.synthesize(test_data.text_alignment, random_state=test_data.random_state)
-                self.assertGreater(len(pcm), 0)
+            pcm, alignments = orca.synthesize(test_data.text_alignment, random_state=test_data.random_state)
+            self.assertGreater(len(pcm), 0)
 
-                previous_word_end_sec = 0
-                previous_phoneme_end_sec = 0
-                for word in alignments:
-                    self.assertTrue(word.start_sec == previous_word_end_sec)
-                    self.assertTrue(word.end_sec > word.start_sec)
-                    previous_word_end_sec = word.end_sec
+            previous_word_end_sec = 0
+            previous_phoneme_end_sec = 0
+            for word in alignments:
+                self.assertTrue(word.start_sec == previous_word_end_sec)
+                self.assertTrue(word.end_sec > word.start_sec)
+                previous_word_end_sec = word.end_sec
 
-                    for phoneme in word.phonemes:
-                        self.assertTrue(phoneme.start_sec == previous_phoneme_end_sec)
-                        self.assertTrue(phoneme.start_sec >= word.start_sec)
-                        self.assertTrue(phoneme.end_sec <= word.end_sec)
-                        self.assertTrue(phoneme.end_sec > phoneme.start_sec)
-                        previous_phoneme_end_sec = phoneme.end_sec
+                for phoneme in word.phonemes:
+                    self.assertTrue(phoneme.start_sec == previous_phoneme_end_sec)
+                    self.assertTrue(phoneme.start_sec >= word.start_sec)
+                    self.assertTrue(phoneme.end_sec <= word.end_sec)
+                    self.assertTrue(phoneme.end_sec > phoneme.start_sec)
+                    previous_phoneme_end_sec = phoneme.end_sec
 
     def test_streaming_synthesis(self) -> None:
         for i, orca in enumerate(self.orcas):
@@ -162,12 +163,8 @@ def test_synthesize_speech_rate(self) -> None:
 
             self.assertLess(len(pcm_fast), len(pcm_slow))
 
-            try:
+            with self.assertRaises(OrcaError):
                 _ = orca.synthesize(test_data.text, speech_rate=9999)
-            except OrcaError:
-                pass
-            else:
-                self.fail("Expected OrcaError")
 
     def test_synthesize_to_file(self) -> None:
         for orca in self.orcas:
diff --git a/binding/python/test_util.py b/binding/python/test_util.py
index f39c6e9e..20c0e686 100644
--- a/binding/python/test_util.py
+++ b/binding/python/test_util.py
@@ -12,7 +12,7 @@
 import json
 import os
 from dataclasses import dataclass
-from typing import List, Sequence, Set
+from typing import List, Sequence
 
 import soundfile
 
@@ -33,7 +33,7 @@ class TestData:
 
 def read_wav_file(path: str) -> Sequence[int]:
     pcm, _ = soundfile.read(path)
-    pcm = list((pcm * 32768))
+    pcm = list(pcm * 32768)
     return pcm
 
 
@@ -47,10 +47,8 @@ def get_test_data() -> TestData:
     with open(data_file_path, encoding="utf8") as data_file:
         test_data = json.loads(data_file.read())
 
-    alignment_data = test_data["alignments"]
-
     alignments = []
-    for word_data in alignment_data:
+    for word_data in test_data["alignments"]:
         phonemes = []
         for phoneme_data in word_data["phonemes"]:
             phoneme = Orca.PhonemeAlignment(
diff --git a/demo/llm/requirements.txt b/demo/llm/requirements.txt
new file mode 100644
index 00000000..164bbbb6
--- /dev/null
+++ b/demo/llm/requirements.txt
@@ -0,0 +1,3 @@
+sounddevice
+tiktoken
+openai
diff --git a/demo/llm/src/llm.py b/demo/llm/src/llm.py
index 5aeb3ff4..73a37914 100644
--- a/demo/llm/src/llm.py
+++ b/demo/llm/src/llm.py
@@ -79,11 +79,7 @@ def _tokenize(self, text: str) -> Sequence[str]:
         return tokens
 
     def _chat(self, user_input: str) -> Generator[str, None, None]:
-        try:
-            text_index = int(user_input)
-            sentence = self._sentences[text_index]
-        except ValueError:
-            sentence = self._sentences[random.randint(0, len(self._sentences) - 1)]
+        sentence = self._sentences[random.randint(0, len(self._sentences) - 1)]
 
         for i in self._tokenize(text=sentence):
             time.sleep(self._tokens_delay)
diff --git a/demo/python/orca_demo.py b/demo/python/orca_demo.py
index 25754b8c..400998e4 100644
--- a/demo/python/orca_demo.py
+++ b/demo/python/orca_demo.py
@@ -55,11 +55,11 @@ def main():
         pcm, alignment = orca.synthesize(args.text)
         processing_time = time.time() - start
         length_sec = len(pcm) / orca.sample_rate
-        with wave.open(args.output_path, 'wb') as output_file:
+        with wave.open(args.output_path, "wb") as output_file:
             output_file.setnchannels(1)
             output_file.setsampwidth(2)
             output_file.setframerate(orca.sample_rate)
-            output_file.writeframes(struct.pack('%dh' % len(pcm), *pcm))
+            output_file.writeframes(struct.pack(f"{len(pcm)}h", *pcm))
         print(
             f"Orca took {processing_time:.2f} seconds to synthesize {length_sec:.2f} seconds of speech which is "
             f"~{length_sec / processing_time:.0f} times faster than real-time.")
diff --git a/demo/python/requirements.txt b/demo/python/requirements.txt
index 8a8d04b9..d52a04df 100644
--- a/demo/python/requirements.txt
+++ b/demo/python/requirements.txt
@@ -1,5 +1,2 @@
 ../../binding/python/dist/pvorca-0.1.4-py3-none-any.whl
 pvorca==0.1.4
-sounddevice
-tiktoken
-openai
diff --git a/lib/ios/PvOrca.xcframework/ios-arm64_x86_64-simulator/PvOrca.framework/Headers/picovoice.h b/lib/ios/PvOrca.xcframework/ios-arm64_x86_64-simulator/PvOrca.framework/Headers/picovoice.h
index 31a8127f..80faad58 100644
--- a/lib/ios/PvOrca.xcframework/ios-arm64_x86_64-simulator/PvOrca.framework/Headers/picovoice.h
+++ b/lib/ios/PvOrca.xcframework/ios-arm64_x86_64-simulator/PvOrca.framework/Headers/picovoice.h
@@ -1,5 +1,5 @@
 /*
-    Copyright 2018-2023 Picovoice Inc.
+    Copyright 2024 Picovoice Inc.
 
     You may not use this file except in compliance with the license. A copy of the license is located in the "LICENSE"
     file accompanying this source.