diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d8926ee116c6..79cd0241ec44 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -6,7 +6,7 @@ updates:
   - package-ecosystem: cargo
     directory: /
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -23,7 +23,7 @@ updates:
   - package-ecosystem: cargo
     directory: /src/bare-metal/alloc-example/
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -40,7 +40,7 @@ updates:
   - package-ecosystem: cargo
     directory: /src/bare-metal/aps/examples/
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -57,7 +57,7 @@ updates:
   - package-ecosystem: cargo
     directory: /src/bare-metal/microcontrollers/examples/
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -74,7 +74,7 @@ updates:
   - package-ecosystem: cargo
     directory: /src/exercises/bare-metal/compass/
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -91,7 +91,7 @@ updates:
   - package-ecosystem: cargo
     directory: /src/exercises/bare-metal/rtc/
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
@@ -108,7 +108,7 @@ updates:
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: weekly
+      interval: monthly
     reviewers:
       - djmitche
       - mgeisler
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d36327e44fba..3ebb627a9670 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -37,7 +37,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Check for typos
-        uses: crate-ci/typos@v1.24.1
+        uses: crate-ci/typos@v1.24.3
         with:
           config: ./.github/typos.toml
 
diff --git a/Cargo.lock b/Cargo.lock
index bb3d2819a963..b3eeb332b02d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -483,9 +483,9 @@ dependencies = [
 
 [[package]]
 name = "cxx"
-version = "1.0.126"
+version = "1.0.128"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c4eae4b7fc8dcb0032eb3b1beee46b38d371cdeaf2d0c64b9944f6f69ad7755"
+checksum = "54ccead7d199d584d139148b04b4a368d1ec7556a1d9ea2548febb1b9d49f9a4"
 dependencies = [
  "cc",
  "cxxbridge-flags",
@@ -495,9 +495,9 @@ dependencies = [
 
 [[package]]
 name = "cxx-build"
-version = "1.0.126"
+version = "1.0.128"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c822bf7fb755d97328d6c337120b6f843678178751cba33c9da25cf522272e0"
+checksum = "c77953e99f01508f89f55c494bfa867171ef3a6c8cea03d26975368f2121a5c1"
 dependencies = [
  "cc",
  "codespan-reporting",
@@ -510,15 +510,15 @@ dependencies = [
 
 [[package]]
 name = "cxxbridge-flags"
-version = "1.0.126"
+version = "1.0.128"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "719d6197dc016c88744aff3c0d0340a01ecce12e8939fc282e7c8f583ee64bc6"
+checksum = "65777e06cc48f0cb0152024c77d6cf9e4bdb4408e7b48bea993d42fa0f5b02b6"
 
 [[package]]
 name = "cxxbridge-macro"
-version = "1.0.126"
+version = "1.0.128"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35de3b547387863c8f82013c4f79f1c2162edee956383e4089e1d04c18c4f16c"
+checksum = "98532a60dedaebc4848cb2cba5023337cc9ea3af16a5b062633fabfd9f18fb60"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -696,9 +696,9 @@ dependencies = [
 
 [[package]]
 name = "fantoccini"
-version = "0.21.1"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "871139c015d646c5fbe287b85876fa060c9d7870ccc388e989c056b303d8462a"
+checksum = "dd52b63e98251013cd5a9e881b9d460fc530e5df4eec58930c9694d6497c53e5"
 dependencies = [
  "base64 0.22.0",
  "cookie 0.18.1",
@@ -2825,9 +2825,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.39.3"
+version = "1.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9babc99b9923bfa4804bd74722ff02c0381021eafa4db9949217e3be8e84fff5"
+checksum = "e2b070231665d27ad9ec9b8df639893f46727666c6767db40317fbe920a5d998"
 dependencies = [
  "backtrace",
  "bytes",
diff --git a/mdbook-slide-evaluator/Cargo.toml b/mdbook-slide-evaluator/Cargo.toml
index 827f02749040..d94e41abbcc3 100644
--- a/mdbook-slide-evaluator/Cargo.toml
+++ b/mdbook-slide-evaluator/Cargo.toml
@@ -11,12 +11,12 @@ description = "A tool for evaluating mdbook slides by rendering the html pages a
 anyhow = "1.0.86"
 clap = { version = "4.5.9", features = ["derive"] }
 csv = "1.3.0"
-fantoccini = "0.21.1"
+fantoccini = "0.21.2"
 glob = "0.3.1"
 log = "0.4.22"
 pretty_env_logger = "0.5.0"
 serde = { version = "1.0.209", features = ["derive"] }
 strum = { version = "0.26.3", features = ["derive"] }
-tokio = { version = "1.38.1", features = ["full"] }
+tokio = { version = "1.40.0", features = ["full"] }
 tokio-util = "0.7.11"
 url = "2.5.2"
diff --git a/src/bare-metal/aps/examples/Cargo.lock b/src/bare-metal/aps/examples/Cargo.lock
index 497d761ff2a6..1e73a454eeb3 100644
--- a/src/bare-metal/aps/examples/Cargo.lock
+++ b/src/bare-metal/aps/examples/Cargo.lock
@@ -27,9 +27,9 @@ checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "cc"
-version = "1.1.14"
+version = "1.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d2eb3cd3d1bf4529e31c215ee6f93ec5a3d536d9f578f93d9d33ee19562932"
+checksum = "57b6a275aa2903740dc87da01c62040406b8812552e97129a63ea8850a17c6e6"
 dependencies = [
  "shlex",
 ]
diff --git a/src/bare-metal/aps/examples/Cargo.toml b/src/bare-metal/aps/examples/Cargo.toml
index 25ae962494c6..d90ac0fbf2db 100644
--- a/src/bare-metal/aps/examples/Cargo.toml
+++ b/src/bare-metal/aps/examples/Cargo.toml
@@ -13,7 +13,7 @@ smccc = "0.1.1"
 spin = "0.9.8"
 
 [build-dependencies]
-cc = "1.1.14"
+cc = "1.1.15"
 
 [[bin]]
 name = "improved"
diff --git a/src/concurrency/async-exercises/chat-async/Cargo.toml b/src/concurrency/async-exercises/chat-async/Cargo.toml
index a42a63b04b69..ad4a4318756a 100644
--- a/src/concurrency/async-exercises/chat-async/Cargo.toml
+++ b/src/concurrency/async-exercises/chat-async/Cargo.toml
@@ -6,5 +6,5 @@ edition = "2021"
 [dependencies]
 futures-util = { version = "0.3.30", features = ["sink"] }
 http = "1.1.0"
-tokio = { version = "1.39.3", features = ["full"] }
+tokio = { version = "1.40.0", features = ["full"] }
 tokio-websockets = { version = "0.9.0", features = ["client", "fastrand", "server", "sha1_smol"] }
diff --git a/src/concurrency/send-sync/examples.md b/src/concurrency/send-sync/examples.md
index d3074df3283c..0a45ba829917 100644
--- a/src/concurrency/send-sync/examples.md
+++ b/src/concurrency/send-sync/examples.md
@@ -30,10 +30,12 @@ Typically because of interior mutability:
 
 ## `!Send + Sync`
 
-These types are thread-safe, but they cannot be moved to another thread:
+These types are safe to access (via shared references) from multiple threads,
+but they cannot be moved to another thread:
 
 - `MutexGuard<T: Sync>`: Uses OS level primitives which must be deallocated on
-  the thread which created them.
+  the thread which created them. However, an already-locked mutex can have its
+  guarded variable read by any thread with which the guard is shared.
 
 ## `!Send + !Sync`
 
diff --git a/src/exercises/bare-metal/rtc/Cargo.lock b/src/exercises/bare-metal/rtc/Cargo.lock
index 5b72f2a0ba4c..81bfb9f653ac 100644
--- a/src/exercises/bare-metal/rtc/Cargo.lock
+++ b/src/exercises/bare-metal/rtc/Cargo.lock
@@ -25,9 +25,9 @@ checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "cc"
-version = "1.1.14"
+version = "1.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d2eb3cd3d1bf4529e31c215ee6f93ec5a3d536d9f578f93d9d33ee19562932"
+checksum = "57b6a275aa2903740dc87da01c62040406b8812552e97129a63ea8850a17c6e6"
 dependencies = [
  "shlex",
 ]
diff --git a/src/exercises/bare-metal/rtc/Cargo.toml b/src/exercises/bare-metal/rtc/Cargo.toml
index 96078ce4bdd9..b522792d3af8 100644
--- a/src/exercises/bare-metal/rtc/Cargo.toml
+++ b/src/exercises/bare-metal/rtc/Cargo.toml
@@ -15,4 +15,4 @@ smccc = "0.1.1"
 spin = "0.9.8"
 
 [build-dependencies]
-cc = "1.1.14"
+cc = "1.1.15"
diff --git a/src/glossary.md b/src/glossary.md
index c00c255ebb97..1d5ea923d09c 100644
--- a/src/glossary.md
+++ b/src/glossary.md
@@ -32,6 +32,9 @@ h1#glossary ~ ul > li:first-line {
   Dynamic memory allocation on [the heap](memory-management/review.md).
 - argument:\
   Information that is passed into a function or method.
+- associated type:\
+  A type associated with a specific trait. Useful for defining the relationship
+  between types.
 - Bare-metal Rust:\
   Low-level Rust development, often deployed to a system without an operating
   system. See [Bare-metal Rust](bare-metal.md).
diff --git a/src/std-types/hashmap.md b/src/std-types/hashmap.md
index 587977c0982e..6399bc15e89f 100644
--- a/src/std-types/hashmap.md
+++ b/src/std-types/hashmap.md
@@ -51,7 +51,7 @@ fn main() {
       .get("Harry Potter and the Sorcerer's Stone")
       .unwrap_or(&336);
   let pc2 = page_counts
-      .entry("The Hunger Games".to_string())
+      .entry("The Hunger Games")
       .or_insert(374);
   ```
 - Unlike `vec!`, there is unfortunately no standard `hashmap!` macro.
diff --git a/src/testing/Cargo.toml b/src/testing/Cargo.toml
index 049f999caef9..a4eaf5fc0adb 100644
--- a/src/testing/Cargo.toml
+++ b/src/testing/Cargo.toml
@@ -4,6 +4,9 @@ version = "0.1.0"
 edition = "2021"
 publish = false
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(never)'] }
+
 [[bin]]
 name = "luhn"
 path = "exercise.rs"