diff --git a/.github/workflows/features.yml b/.github/workflows/features.yml
index 7fadff2..caf9bab 100644
--- a/.github/workflows/features.yml
+++ b/.github/workflows/features.yml
@@ -10,9 +10,9 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Fetch toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@v1
         with:
           profile: minimal
           toolchain: nightly
diff --git a/.github/workflows/minimal-versions.yml b/.github/workflows/minimal-versions.yml
index c9490c9..b92e5ae 100644
--- a/.github/workflows/minimal-versions.yml
+++ b/.github/workflows/minimal-versions.yml
@@ -10,9 +10,9 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Fetch toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@v1
         with:
           profile: minimal
           toolchain: nightly
diff --git a/.github/workflows/msrv-build.yml b/.github/workflows/msrv-build.yml
index 641ea10..3ef2fa8 100644
--- a/.github/workflows/msrv-build.yml
+++ b/.github/workflows/msrv-build.yml
@@ -10,9 +10,9 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Fetch toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@v1
         with:
           profile: minimal
           toolchain: 1.56.0
diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index 156479b..929368d 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -15,11 +15,10 @@ jobs:
         toolchain: [stable, beta, nightly]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Fetch toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@v1
         with:
-          profile: minimal
           toolchain: ${{ matrix.toolchain }}
           components: rustfmt, clippy
           target: thumbv6m-none-eabi
diff --git a/Cargo.toml b/Cargo.toml
index 968894b..de3e040 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,3 +3,4 @@ members = ["metadata_checks", "num_enum", "num_enum_derive", "renamed_num_enum",
 # Exclude num_enum_derive because its useful doc comments import num_enum, which the crate doesn't do (because it would
 # cause a circular dependency), so the doc tests don't actually compile.
 default-members  = ["num_enum", "renamed_num_enum", "serde_example", "stress_tests"]
+resolver = "2"
diff --git a/num_enum_derive/src/parsing.rs b/num_enum_derive/src/parsing.rs
index 9d511b5..cfc0b46 100644
--- a/num_enum_derive/src/parsing.rs
+++ b/num_enum_derive/src/parsing.rs
@@ -86,11 +86,11 @@ impl EnumInfo {
     }
 
     fn parse_attrs<Attrs: Iterator<Item = Attribute>>(
-        mut attrs: Attrs,
+        attrs: Attrs,
     ) -> Result<(Ident, Option<ErrorType>)> {
         let mut maybe_repr = None;
         let mut maybe_error_type = None;
-        while let Some(attr) = attrs.next() {
+        for attr in attrs {
             if let Meta::List(meta_list) = &attr.meta {
                 if let Some(ident) = meta_list.path.get_ident() {
                     if ident == "repr" {