diff --git a/.github/workflows/fmt.yml b/.github/workflows/fmt.yml
index e665005..cf5becb 100644
--- a/.github/workflows/fmt.yml
+++ b/.github/workflows/fmt.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run Cargo Fmt
         run: cargo fmt --all -- --check
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 90ad01b..a08b422 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Cache Cargo
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/registry
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7f77f46..62a2011 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
 
       - uses: actions/cache@v4
         with:
diff --git a/Cargo.lock b/Cargo.lock
index 9921f57..af8f6c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -189,9 +189,9 @@ checksum = "325918d6fe32f23b19878fe4b34794ae41fc19ddbe53b10571a4874d44ffd39b"
 
 [[package]]
 name = "cc"
-version = "1.2.3"
+version = "1.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27f657647bcff5394bf56c7317665bbf790a137a50eaaa5c6bfbb9e27a518f2d"
+checksum = "8691782945451c1c383942c4874dbe63814f61cb57ef773cda2972682b7bb3c0"
 dependencies = [
  "shlex",
 ]
@@ -293,9 +293,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.5.13"
+version = "0.5.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33480d6946193aa8033910124896ca395333cae7e2d1113d1fef6c3272217df2"
+checksum = "82b8f8f868b36967f9606790d1903570de9ceaf870a7bf9fbbd3016d636a2cb2"
 dependencies = [
  "crossbeam-utils",
 ]
@@ -1433,15 +1433,14 @@ dependencies = [
 
 [[package]]
 name = "ring"
-version = "0.17.8"
+version = "0.17.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c17fa4cb658e3583423e915b9f3acc01cceaee1860e33d59ebae66adc3a2dc0d"
+checksum = "a4689e6c2294d81e88dc6261c768b63bc4fcdb852be6d1352498b114f61383b7"
 dependencies = [
  "cc",
  "cfg-if",
  "getrandom",
  "libc",
- "spin",
  "untrusted",
  "windows-sys 0.52.0",
 ]
@@ -1621,12 +1620,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "spin"
-version = "0.9.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
-
 [[package]]
 name = "stable_deref_trait"
 version = "1.2.0"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index c1f5c7b..58e76ec 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.75.0"
+channel = "1.84.0"
 components = ["rustfmt", "clippy"]
diff --git a/src/dfxvm/self_update.rs b/src/dfxvm/self_update.rs
index c043a61..bf84721 100644
--- a/src/dfxvm/self_update.rs
+++ b/src/dfxvm/self_update.rs
@@ -119,8 +119,7 @@ fn extract_binary(
     Archive::new(tar)
         .entries()
         .map_err(ReadArchiveEntries)?
-        .enumerate()
-        .filter_map(|(_i, entry)| entry.ok())
+        .filter_map(|entry| entry.ok())
         .find(|entry| {
             entry
                 .header()
diff --git a/src/fs.rs b/src/fs.rs
index c98ab28..7bcd0ec 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -9,7 +9,6 @@ use std::path::{Path, PathBuf};
 // Derived from append_file() in https://github.com/rust-lang/rustup/blob/master/src/utils/raw.rs
 pub fn append_to_file(dest: &Path, line: &str) -> Result<(), AppendToFileError> {
     let mut file = std::fs::OpenOptions::new()
-        .write(true)
         .append(true)
         .create(true)
         .open(dest)