diff --git a/faster_whisper/transcribe.py b/faster_whisper/transcribe.py
index 530232e..2d614ac 100644
--- a/faster_whisper/transcribe.py
+++ b/faster_whisper/transcribe.py
@@ -305,7 +305,6 @@ class WhisperModel:
         result = None
         avg_log_prob = None
         final_temperature = None
-        max_length = min(self.max_length, 2 * (self.max_length - len(prompt)))
 
         for temperature in options.temperatures:
             if temperature > 0:
@@ -326,7 +325,7 @@ class WhisperModel:
                 features,
                 [prompt],
                 length_penalty=options.length_penalty,
-                max_length=max_length,
+                max_length=self.max_length,
                 return_scores=True,
                 return_no_speech_prob=True,
                 **kwargs,
diff --git a/requirements.txt b/requirements.txt
index 160f19d..767f650 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 av==10.*
-ctranslate2>=3.6,<4
+ctranslate2>=3.7,<4
 tokenizers==0.13.*