diff --git a/pyproject.toml b/pyproject.toml
index 91d62215..2539a35f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -163,11 +163,11 @@ transformers-legacy = [
 # ctranslate2 is isolated as an optional extra for c_translate / c_generate / c_whisper.
 
 ctranslate = [
-    "ctranslate2==4.6.0",
+    "ctranslate2==4.8.0",
 ]
 # Deprecated alias; use ctranslate instead.
 whisper = [
-    "ctranslate2==4.6.0",
+    "ctranslate2==4.8.0",
 ]
 vllm = [
     "vllm>=0.16.0",