diff --git a/action.yml b/action.yml
index 91a41bc..3e127bb 100644
--- a/action.yml
+++ b/action.yml
@@ -6,10 +6,6 @@ branding:
   color: purple
 
 inputs:
-  toolchain:
-    description: Rust toolchain specification -- see https://rust-lang.github.io/rustup/concepts/toolchains.html#toolchain-specification
-    required: false
-    default: 1.80.0
   targets:
     description: Comma-separated list of target triples to install for this toolchain
     required: false
@@ -46,7 +42,7 @@ runs:
           echo "toolchain=$toolchain" >> $GITHUB_OUTPUT
         fi
       env:
-        toolchain: ${{inputs.toolchain}}
+        toolchain: 1.90.0
       shell: bash
 
     - id: flags
@@ -54,17 +50,22 @@ runs:
         : construct rustup command line
         echo "targets=$(for t in ${targets//,/ }; do echo -n ' --target' $t; done)" >> $GITHUB_OUTPUT
         echo "components=$(for c in ${components//,/ }; do echo -n ' --component' $c; done)" >> $GITHUB_OUTPUT
-        echo "downgrade=${{inputs.toolchain == 'nightly' && inputs.components && ' --allow-downgrade' || ''}}" >> $GITHUB_OUTPUT
+        echo "downgrade=${{steps.parse.outputs.toolchain == 'nightly' && inputs.components && ' --allow-downgrade' || ''}}" >> $GITHUB_OUTPUT
       env:
         targets: ${{inputs.targets || inputs.target || ''}}
         components: ${{inputs.components}}
       shell: bash
 
+    - run: |
+        : set $CARGO_HOME
+        echo CARGO_HOME=${CARGO_HOME:-${{runner.os == 'Windows' && '$USERPROFILE' || '$HOME'}}/.cargo} >> $GITHUB_ENV
+      shell: bash
+
     - run: |
         : install rustup if needed
         if ! command -v rustup &>/dev/null; then
           curl --proto '=https' --tlsv1.2 --retry 10 --retry-connrefused --location --silent --show-error --fail "https://sh.rustup.rs" | sh -s -- --default-toolchain none -y
-          echo "${CARGO_HOME:-$HOME/.cargo}/bin" >> $GITHUB_PATH
+          echo "$CARGO_HOME/bin" >> $GITHUB_PATH
         fi
       if: runner.os != 'Windows'
       shell: bash
diff --git a/scripts/update-revs.sh b/scripts/update-revs.sh
index 4cd3ae5..c5c7841 100755
--- a/scripts/update-revs.sh
+++ b/scripts/update-revs.sh
@@ -10,11 +10,11 @@ fi
 patch_releases=(
     1.12.1 1.15.1 1.22.1 1.24.1 1.26.1 1.26.2 1.27.1 1.27.2 1.29.1 1.29.2 1.30.1
     1.31.1 1.34.1 1.34.2 1.41.1 1.43.1 1.44.1 1.45.1 1.45.2 1.52.1 1.56.1 1.58.1
-    1.62.1 1.66.1 1.67.1 1.68.1 1.68.2 1.71.1 1.72.1
+    1.62.1 1.66.1 1.67.1 1.68.1 1.68.2 1.71.1 1.72.1 1.74.1 1.77.1 1.77.2
 )
 
 releases() {
-    printf "%s\n" 1.{0..80}.0 ${patch_releases[@]} | sort -V
+    printf "%s\n" 1.{0..90}.0 ${patch_releases[@]} | sort -V
 }
 
 base=$(git rev-parse HEAD)
@@ -29,7 +29,11 @@ for rev in `releases` stable beta nightly; do
     echo "Updating $rev branch"
     git checkout --quiet "$base"
     git branch --quiet --delete --force $rev &>/dev/null || true
-    sed -i "s/required: true/required: false\n    default: $rev/" action.yml
+    if [[ $rev == 1* ]]; then
+        sed -i "/^  toolchain:/,+2d; s/\${{inputs\.toolchain}}/$rev/" action.yml
+    else
+        sed -i "s/required: true/required: false\n    default: $rev/" action.yml
+    fi
     git add action.yml
     git commit --quiet --message "toolchain: $rev"
     git checkout --quiet -b $rev
@@ -43,12 +47,8 @@ for tool in clippy miri; do
     echo "Updating $tool branch"
     git checkout --quiet --detach nightly
     git branch --quiet --delete --force $tool &>/dev/null || true
-    if [ $tool == miri ]; then
-        default="miri, rust-src"
-        echo -e "    - uses: dtolnay/install@xargo\n      with:\n        bin: xargo-check" >> action.yml
-    else
-        default=$tool
-    fi
+    default=$tool
+    if [ $tool == miri ]; then default+=,\ rust-src; fi
     sed -i "/required: false/{N;s/\n$/\n    default: $default\n/}" action.yml
     git add action.yml
     git commit --quiet --message "components: $tool"