diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index 8215211ea1c9d..ef33eb5944c72 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -1461,18 +1461,18 @@ impl Step for Miri {
         builder.create_dir(&image);
 
         // Prepare the image directory
-        // We expect miri to build, because we've exited this step above if tool
-        // state for miri isn't testing.
+        // We're always fine with miri not building, we don't ship it on
+        // beta/stable anyway.
         let miri = builder
             .ensure(tool::Miri { compiler, target, extra_features: Vec::new() })
             .or_else(|| {
-                missing_tool("miri", builder.build.config.missing_tools);
+                missing_tool("miri", true);
                 None
             })?;
         let cargomiri = builder
             .ensure(tool::CargoMiri { compiler, target, extra_features: Vec::new() })
             .or_else(|| {
-                missing_tool("cargo miri", builder.build.config.missing_tools);
+                missing_tool("cargo miri", true);
                 None
             })?;
 
diff --git a/src/ci/run.sh b/src/ci/run.sh
index 59f2736cbd406..ff737ea869f2b 100755
--- a/src/ci/run.sh
+++ b/src/ci/run.sh
@@ -51,7 +51,7 @@ fi
 #
 # FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
 #        either automatically or manually.
-export RUST_RELEASE_CHANNEL=nightly
+export RUST_RELEASE_CHANNEL=beta
 
 # Always set the release channel for bootstrap; this is normally not important (i.e., only dist
 # builds would seem to matter) but in practice bootstrap wants to know whether we're targeting
diff --git a/src/stage0.txt b/src/stage0.txt
index 4d9a91e38b33c..920b0e3bef1c6 100644
--- a/src/stage0.txt
+++ b/src/stage0.txt
@@ -12,15 +12,15 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2020-03-12
-rustc: beta
-cargo: beta
+date: 2020-04-21
+rustc: 1.43.0
+cargo: 0.44.0
 
 # We use a nightly rustfmt to format the source because it solves some
 # bootstrapping issues with use of new syntax in this repo. If you're looking at
 # the beta/stable branch, this key should be omitted, as we don't want to depend
 # on rustfmt from nightly there.
-rustfmt: nightly-2020-01-31
+#rustfmt: nightly-2020-01-31
 
 # When making a stable release the process currently looks like:
 #
@@ -40,4 +40,4 @@ rustfmt: nightly-2020-01-31
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-#dev: 1
+dev: 1
diff --git a/src/tools/rustfmt b/src/tools/rustfmt
index a5cb5d26833cf..e417356684a36 160000
--- a/src/tools/rustfmt
+++ b/src/tools/rustfmt
@@ -1 +1 @@
-Subproject commit a5cb5d26833cfda6fa2ed35735448953f728bd5e
+Subproject commit e417356684a36ae9c8c4014e8f0cd86650e40dd2