diff --git a/isso/Dockerfile b/isso/Dockerfile
index 8d496c6..98f0f41 100644
--- a/isso/Dockerfile
+++ b/isso/Dockerfile
@@ -21,8 +21,7 @@ RUN echo "@community https://nl.alpinelinux.org/alpine/v3.4/community" >> /etc/a
     tini@community \
  && pip install --no-cache cffi \
  && pip install --no-cache misaka==1.0.2 \
- && wget -q https://github.com/posativ/isso/releases/download/$ISSO_VER/isso-$ISSO_VER.tar.gz -P /tmp \
- && pip install /tmp/isso-$ISSO_VER.tar.gz \
+ && pip install --no-cache "isso==$ISSO_VER}" \
  && apk del ${BUILD_DEPS} \
  && rm -rf /var/cache/apk/* /tmp/*