diff --git a/Dockerfile b/Dockerfile
index cf74ab0..fa0998c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,20 +36,21 @@ ENV SNIKKET_WEB_PROSODY_ENDPOINT=http://127.0.0.1:5280/
 
 HEALTHCHECK CMD nc -zv ${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_INTERFACE:-127.0.0.1} ${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT:-5765}
 
+COPY requirements.txt /opt/snikket-web-portal/requirements.txt
+
+WORKDIR /opt/snikket-web-portal
+
 RUN set -eu; \
     export DEBIAN_FRONTEND=noninteractive ; \
     apt-get update ; \
     apt-get install -y --no-install-recommends \
-        python3 python3-pip python3-setuptools python3-wheel; \
+        python3 python3-pip python3-setuptools python3-wheel build-essential; \
+    pip3 install -r requirements.txt; \
+    apt-get remove -y --autoremove build-essential; \
     apt-get clean ; rm -rf /var/lib/apt/lists; \
     pip3 install hypercorn; \
     rm -rf /root/.cache;
 
-WORKDIR /opt/snikket-web-portal
-
-COPY requirements.txt /opt/snikket-web-portal/requirements.txt
-RUN set -eu; pip3 install -r requirements.txt; rm -rf /root/.cache;
-
 COPY --from=build /opt/snikket-web-portal/snikket_web/ /opt/snikket-web-portal/snikket_web
 COPY babel.cfg /opt/snikket-web-portal/babel.cfg