diff --git a/book.toml b/book.toml
index bf3f0b05b..2f67aecf6 100644
--- a/book.toml
+++ b/book.toml
@@ -42,9 +42,15 @@ exclude = [
     "marketplace\\.visualstudio\\.com",
     "objects\\.githubusercontent\\.com",
     # The bug listing URL works only if an user is logged in, otherwise one gets 404.
-    "github\\.com/issues\\?",
+    "github\\.com/issues\\?q=.*",
+    # Similarly 500 is sometimes returned here.
+    "github\\.com/rust-lang/rust/pulls\\?q=.*",
+    # 401 is returned here for unknown reason
+    "github\\.com/wesleywiser/rustc-bootstrap-wpa-analysis",
     # Handle: connection closed before message completed
     "microsoft\\.com/en-us/research/publication/",
+    # 500 is returned for HEAD request
+    "code\\.visualstudio\\.com/docs/editor/tasks",
 ]
 cache-timeout = 86400
 warning-policy = "error"