diff --git a/concordia-preprocessor/Dockerfile b/concordia-preprocessor/Dockerfile
index 87674ae..d348035 100644
--- a/concordia-preprocessor/Dockerfile
+++ b/concordia-preprocessor/Dockerfile
@@ -9,8 +9,9 @@ ENV LANGUAGE pl_PL:pl
 ENV LC_ALL pl_PL.UTF-8   
 
 RUN add-apt-repository 'deb http://sgjp.pl/apt/ubuntu-xenial xenial main' && apt-get update
-RUN apt-get install --allow-unauthenticated -y git python3 python3-pip morfeusz2
+RUN apt-get install --allow-unauthenticated -y git python3 python3-pip morfeusz2 python3-nltk
 RUN pip3 install flask flask_restful gunicorn requests
+RUN python3 -c "import nltk;nltk.download('wordnet')"
 
 COPY python3-morfeusz2_0.4.0-1_amd64.deb /
 RUN dpkg -i python3-morfeusz2_0.4.0-1_amd64.deb