diff --git a/WORKSPACE b/WORKSPACE
index 20f23fd8d..d54173e5b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -16,6 +16,12 @@ load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 gazelle_dependencies()
 
 # Add dependencies on external repositories.
+go_repository(
+    name = "com_github_cenkalti_backoff",
+    importpath = "github.com/cenkalti/backoff",
+    commit = "66e726b43552c0bab0539b28e640b89fd6862115",
+)
+
 go_repository(
     name = "com_github_google_go-cmp",
     importpath = "github.com/google/go-cmp",