diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 5bb6754561..981972a431 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -21,10 +21,15 @@ updates:
     schedule:
       interval: "weekly"
 
-  - package-ecosystem: "cargo"
-    directory: "proto-compiler"
-    schedule:
-      interval: "weekly"
+## Disable dependabot for `proto-compiler`.
+## Rationale: we maintain the dependencies for proto-compiler
+##    manually, so that we update the proto-compiler binary
+##    (and the Cargo.lock file) only when we regenerate
+##    Rust types from the .proto files.
+#  - package-ecosystem: "cargo"
+#    directory: "proto-compiler"
+#    schedule:
+#      interval: "weekly"
 
   - package-ecosystem: "cargo"
     directory: "relayer"