diff --git a/Dockerfile.cuda11 b/Dockerfile.cuda11
index c0e2f1aec9766899106016269e1a7228621e84de..db2090a53617d26ec067569a118a85080971d8b1 100644
--- a/Dockerfile.cuda11
+++ b/Dockerfile.cuda11
@@ -7,7 +7,7 @@ WORKDIR /app
 COPY requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt
 # https://github.com/marella/ctransformers#cuda
-RUN pip3 install ctransformers[cuda]
+RUN pip3 install ctransformers[cuda11]
 COPY . .
 EXPOSE 8000
 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
diff --git a/requirements.txt b/requirements.txt
index a9ac00bf4e43f8d7e2df7e437cc58a076efb254d..be7fa6608466f189dacc4a1db7908113d9373e05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ blake3==0.3.3
 certifi==2023.7.22
 charset-normalizer==3.1.0
 click==8.1.3
-ctransformers
+ctransformers==0.2.27
 fastapi==0.95.2
 filelock==3.12.0
 fsspec==2023.5.0