diff --git a/Dockerfile b/Dockerfile
index 0848e25c9..7a5adbf3d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -40,7 +40,7 @@ COPY MANIFEST.in README.rst setup.py synctl /synapse/
 RUN pip install --prefix="/install" --no-warn-script-location \
         /synapse[all] \
 	'git+https://github.com/maunium/synapse-simple-antispam#egg=synapse-simple-antispam' \
-	'git+https://github.com/devture/matrix-synapse-shared-secret-auth#egg=shared_secret_authenticator'
+	'git+https://github.com/devture/matrix-synapse-shared-secret-auth@e178353ec87c56e0169dd04466d4769da5ed9c46#egg=shared_secret_authenticator'
 
 FROM docker.io/python:${PYTHON_VERSION}-slim