diff --git a/docker/engine.Dockerfile b/docker/engine.Dockerfile
index ccd9f6f6c4..412da8ab0e 100644
--- a/docker/engine.Dockerfile
+++ b/docker/engine.Dockerfile
@@ -64,9 +64,6 @@ RUN case "${ENGINE}" in \
     esac \
     && if [ -n "${ENGINE_REPO}" ]; then \
          bash /tmp/scripts/install-${ENGINE}.sh /opt/engine-src; \
-       fi \
-    && if [ "${ENGINE}" = "vllm" ]; then \
-         pip install --no-cache-dir smg-grpc-proto "smg-grpc-servicer[vllm]"; \
        fi
 
 ENTRYPOINT ["smg"]
diff --git a/scripts/installation/install-smg.sh b/scripts/installation/install-smg.sh
index 61466d0efc..de9e0346b6 100755
--- a/scripts/installation/install-smg.sh
+++ b/scripts/installation/install-smg.sh
@@ -29,3 +29,11 @@ pip install --no-cache-dir --upgrade pip \
 cd "${SMG_SRC}/bindings/python"
 ulimit -n 65536 && maturin build --release --features vendored-openssl --out dist
 pip install --force-reinstall dist/*.whl
+
+# Install smg-grpc-proto and smg-grpc-servicer from source so the image stays
+# in sync with this repo. --force-reinstall overrides any stale version the
+# engine base image may have preinstalled (e.g. lmsysorg/sglang ships an older
+# smg-grpc-servicer pulled from PyPI at its own build time).
+pip install --no-cache-dir --force-reinstall \
+    "${SMG_SRC}/crates/grpc_client/python" \
+    "${SMG_SRC}/grpc_servicer"