diff --git a/deploy/server/Dockerfile b/deploy/server/Dockerfile
index 005b71d..0eea7c6 100644
--- a/deploy/server/Dockerfile
+++ b/deploy/server/Dockerfile
@@ -9,8 +9,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends pkg-config liba
 ARG JOBS=
 WORKDIR /src
 COPY . .
-# The registry and target caches survive rebuilds, so an update only recompiles what changed.
+# The registry, git and target caches survive rebuilds, so an update only recompiles what changed
+# (and a dependency taken from GitHub isn't fetched again: a slow GitHub failed a server's update).
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
     --mount=type=cache,target=/src/target \
     cargo build --release --bin anybot ${JOBS:+-j $JOBS} \
     && cp target/release/anybot /anybot