diff --git a/Dockerfile b/Dockerfile
index 62a4d50b2e7d45779ef9d01044cdc63bd68bcbd6..68fc3ce26da098edfaaa82909ec73ede79f48716 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -51,7 +51,7 @@ RUN wget -nv -O miniconda.sh https://repo.anaconda.com/miniconda/Miniconda3-py37
 ENV PATH ${CONDA_DIR}/bin:${PATH}
 
 RUN conda install cmake -y
-COPY --chown=${USER_NAME}:${USER_NAME} requirements.txt ${HOME_DIR}/requirements.txt
+COPY --chown=${HOST_UID}:${HOST_GID} requirements.txt ${HOME_DIR}/requirements.txt
 RUN pip install -r requirements.txt --no-cache-dir
 
-COPY --chown=${USER_NAME}:${USER_NAME} . ${HOME_DIR}
+COPY --chown=${HOST_UID}:${HOST_GID} . ${HOME_DIR}
diff --git a/requirements.txt b/requirements.txt
index cba0dd1cea28496881ccd890dea7674d2c47428f..f8e9f27345b984a51a601d960d8ea99710982b5c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 aicrowd-api
 aicrowd-gym
+numpy
 nle --no-binary :all: