diff --git a/Dockerfile.ci b/Dockerfile.ci
index 82e2afc..72e4180 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -43,7 +43,7 @@ COPY optional-requirements.txt /opt/maubot/optional-requirements.txt
 WORKDIR /opt/maubot
 RUN apk add --virtual .build-deps python3-dev build-base git \
     && pip3 install -r requirements.txt -r optional-requirements.txt \
-        dateparser langdetect python-gitlab pyquery cchardet semver tzlocal cssselect \
+        dateparser langdetect python-gitlab pyquery semver tzlocal cssselect \
     && apk del .build-deps
 # TODO also remove dateparser, langdetect and pyquery when maubot supports installing dependencies