diff --git a/src/doc/reference b/src/doc/reference
index b5c68b02984..a01d151a725 160000
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit b5c68b02984f74e99d1f1b332029e05f607e2660
+Subproject commit a01d151a7250a540a9cb7ccce5956f020c677c21
diff --git a/src/doc/rustc-dev-guide b/src/doc/rustc-dev-guide
index fba15a46ca8..b06008731af 160000
--- a/src/doc/rustc-dev-guide
+++ b/src/doc/rustc-dev-guide
@@ -1 +1 @@
-Subproject commit fba15a46ca8efa97e8a955794724ac7ce27805b8
+Subproject commit b06008731af0f7d07cd0614e820c8276dfed1c18
diff --git a/src/tools/tidy/src/edition.rs b/src/tools/tidy/src/edition.rs
index b5e9ceddbaf..3f59fefd041 100644
--- a/src/tools/tidy/src/edition.rs
+++ b/src/tools/tidy/src/edition.rs
@@ -18,21 +18,13 @@ pub fn check(path: &Path, bad: &mut bool) {
         &mut |path| super::filter_dirs(path) || path.ends_with("src/test"),
         &mut |entry, contents| {
             let file = entry.path();
-            let filestr = file.to_string_lossy().replace("\\", "/");
             let filename = file.file_name().unwrap();
             if filename != "Cargo.toml" {
                 return;
             }
 
             // Library crates are not yet ready to migrate to 2021.
-            //
-            // The reference and rustc-dev-guide are submodules, so are left at
-            // 2018 for now. They should be removed from this exception list
-            // when bumped.
-            if path.components().any(|c| c.as_os_str() == "library")
-                || filestr.contains("src/doc/reference/style-check/Cargo.toml")
-                || filestr.contains("src/doc/rustc-dev-guide/ci/date-check/Cargo.toml")
-            {
+            if path.components().any(|c| c.as_os_str() == "library") {
                 let has = contents.lines().any(is_edition_2018);
                 if !has {
                     tidy_error!(