diff --git a/Dockerfile b/Dockerfile
index 1e8e748..7602a94 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,7 +18,8 @@ RUN apt-get update \
  && rm -rf /var/lib/apt/lists/* \
  && pip3 install \
       setuptools \
-      wheel
+      wheel \
+      chardet
 
 ENV PYFLOW_VERSION=1.1.20
 ADD "https://github.com/Illumina/pyflow/releases/download/v${PYFLOW_VERSION}/pyflow-${PYFLOW_VERSION}.tar.gz" .