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-rw-r--r--.dockerignore1
-rw-r--r--changelog.d/14129.bugfix1
-rw-r--r--docker/Dockerfile2
3 files changed, 3 insertions, 1 deletions
diff --git a/.dockerignore b/.dockerignore
index 1c6905b1bb..0b51345cbd 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -9,6 +9,7 @@
 !pyproject.toml
 !poetry.lock
 !Cargo.lock
+!Cargo.toml
 !build_rust.py
 
 rust/target
diff --git a/changelog.d/14129.bugfix b/changelog.d/14129.bugfix
new file mode 100644
index 0000000000..2c016c0c4a
--- /dev/null
+++ b/changelog.d/14129.bugfix
@@ -0,0 +1 @@
+Fix an issue with Docker images causing the Rust dependencies to not be pinned correctly.
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b20951d4cf..8be49681b4 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -121,7 +121,7 @@ RUN --mount=type=cache,target=/root/.cache/pip \
 COPY synapse /synapse/synapse/
 COPY rust /synapse/rust/
 # ... and what we need to `pip install`.
-COPY pyproject.toml README.rst build_rust.py /synapse/
+COPY pyproject.toml README.rst build_rust.py Cargo.toml Cargo.lock /synapse/
 
 # Repeat of earlier build argument declaration, as this is a new build stage.
 ARG TEST_ONLY_IGNORE_POETRY_LOCKFILE