diff --git a/Dockerfile b/Dockerfile
index 79fad83..d5fba99 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,7 +39,9 @@ RUN apt-get update \
 #COPY supervisely_lib /workdir/supervisely_lib
 
 COPY requirements.txt /workdir/requirements.txt
-RUN pip install --no-cache-dir -r /workdir/requirements.txt
+RUN python3.8 -m pip install --upgrade pip
+RUN python3.8 -m pip install chardet
+RUN python3.8 -m pip install --no-cache-dir -r /workdir/requirements.txt
 
 COPY . /workdir
 
diff --git a/requirements.txt b/requirements.txt
index 58d546d..cac7614 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,6 @@ filelock==3.13.1
 torch==1.7.1+cu110
 torchvision==0.8.2+cu110
 -f https://download.pytorch.org/whl/torch_stable.html
-chardet
 # supervisely==6.73.111
 # for development
 git+https://github.com/supervisely/supervisely.git@proto-update