diff --git a/metropolis/proto/common/BUILD.bazel b/metropolis/proto/common/BUILD.bazel
index 5ddb3f7..05c4995 100644
--- a/metropolis/proto/common/BUILD.bazel
+++ b/metropolis/proto/common/BUILD.bazel
@@ -7,6 +7,7 @@
     srcs = ["common.proto"],
     visibility = ["//metropolis:__subpackages__"],
     deps = [
+        "//version/spec:spec_proto",
         "@com_google_protobuf//:timestamp_proto",
     ],
 )
@@ -16,6 +17,7 @@
     importpath = "source.monogon.dev/metropolis/proto/common",
     proto = ":common_proto",
     visibility = ["//metropolis:__subpackages__"],
+    deps = ["//version/spec"],
 )
 
 go_library(