diff --git a/pages/students/2016/jakub_maruniak/dp2021/annotation/Dockerfile b/pages/students/2016/jakub_maruniak/dp2021/annotation/Dockerfile
index 4148099448..e9e36bc6fb 100644
--- a/pages/students/2016/jakub_maruniak/dp2021/annotation/Dockerfile
+++ b/pages/students/2016/jakub_maruniak/dp2021/annotation/Dockerfile
@@ -9,6 +9,7 @@ RUN mkdir /work
 COPY ./ner /work
 RUN pip install prodigy-1.9.6-cp36.cp37.cp38-cp36m.cp37m.cp38-linux_x86_64.whl
 RUN pip install https://files.kemt.fei.tuke.sk/models/spacy/sk_sk1-0.0.1.tar.gz
+RUN pip install nltk
 EXPOSE 8080
 ENV PRODIGY_HOME /work
 ENV PRODIGY_HOST 0.0.0.0