diff --git a/synapse/Dockerfile b/synapse/Dockerfile
index cccd97b..b80314b 100644
--- a/synapse/Dockerfile
+++ b/synapse/Dockerfile
@@ -29,6 +29,7 @@ RUN apt-get update && apt-get install -y \
     openssl \
     rustc \
     zlib1g-dev \
+    python3-pip \
     python3-jsonschema \
     python3-frozendict \
     python3-unpaddedbase64 \
@@ -82,7 +83,7 @@ COPY synapse /synapse/synapse/
 # Install the synapse package itself and all of its children packages.
 #
 # This is aiming at installing only the `packages=find_packages(...)` from `setup.py
-RUN pip install --prefix="/install" --no-deps --no-warn-script-location /synapse
+RUN pip3 install --prefix="/install" --no-deps --no-warn-script-location /synapse
 
 ###
 ### Stage 1: runtime