diff --git a/changelog.d/12853.docker b/changelog.d/12853.docker
new file mode 100644
index 0000000000..cad10a79cc
--- /dev/null
+++ b/changelog.d/12853.docker
@@ -0,0 +1 @@
+Fix the docker file after a dependency update.
diff --git a/docker/Dockerfile b/docker/Dockerfile
index ccc6a9f778..7af0e51f97 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -55,7 +55,7 @@ RUN \
 # NB: In poetry 1.2 `poetry export` will be moved into a plugin; we'll need to also
 # pip install poetry-plugin-export (https://github.com/python-poetry/poetry-plugin-export).
 RUN --mount=type=cache,target=/root/.cache/pip \
-  pip install --user git+https://github.com/python-poetry/poetry.git@fb13b3a676f476177f7937ffa480ee5cff9a90a5
+  pip install --user "poetry-core==1.1.0a7" "git+https://github.com/python-poetry/poetry.git@fb13b3a676f476177f7937ffa480ee5cff9a90a5"
 
 WORKDIR /synapse