diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index c2d377f6b..670d42ac6 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -20,11 +20,11 @@ jobs:
   tests:
     strategy:
       matrix:
-        rust_version: [1.66.0, stable]
+        rust_version: [1.67.0, stable]
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Install Rust toolchain
@@ -36,13 +36,6 @@ jobs:
       run: rustup default ${{ matrix.rust_version }}
     - name: print rustc version
       run: rustc --version
-    # remove this step when MSRV >= 1.67.0
-    - name: downgrade `toml_edit`, time`, `toml_datetime` crate to support older Rust toolchain
-      if: matrix.rust_version == '1.66.0' 
-      run: |
-        cargo update -p toml_edit --precise 0.20.2
-        cargo update -p toml_datetime --precise 0.6.3
-        cargo update -p time --precise 0.3.23
     - name: Run tests
       run: ./.github/test.sh
 
@@ -50,7 +43,7 @@ jobs:
   test_exhaustive_checks:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install nightly for exhaustive check tests
       uses: dtolnay/rust-toolchain@nightly
     # a failure on this check means, that some of `syn` crate's enums have been extended
@@ -64,7 +57,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Run clippy
       run: cargo clippy --features unstable__schema --benches -- -D clippy::all
 
@@ -72,7 +65,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Run cargo fmt
       run: cargo fmt --check
 
@@ -83,7 +76,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: run cargo doc
       run: RUSTDOCFLAGS="-D warnings" cargo doc --features derive,unstable__schema
 
@@ -93,7 +86,7 @@ jobs:
     if: github.ref == 'refs/heads/master'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           token: ${{ secrets.CUSTOM_GITHUB_TOKEN }}
diff --git a/Cargo.toml b/Cargo.toml
index 90c2c3f66..725317b3d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,4 +4,4 @@ members = ["borsh", "borsh-derive", "fuzz/fuzz-run", "benchmarks"]
 [workspace.package]
 # shared version of all public crates in the workspace
 version = "1.3.0"
-rust-version = "1.66.0"
+rust-version = "1.67.0"
diff --git a/README.md b/README.md
index 96ff7fbfd..bb04fd5a1 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
-# Borsh in Rust   [![Latest Version]][crates.io] [![borsh: rustc 1.66+]][Rust 1.66] [![License Apache-2.0 badge]][License Apache-2.0] [![License MIT badge]][License MIT]
+# Borsh in Rust   [![Latest Version]][crates.io] [![borsh: rustc 1.67+]][Rust 1.67] [![License Apache-2.0 badge]][License Apache-2.0] [![License MIT badge]][License MIT]
 
 [Borsh]: https://borsh.io
 [Latest Version]: https://img.shields.io/crates/v/borsh.svg
 [crates.io]: https://crates.io/crates/borsh
-[borsh: rustc 1.66+]: https://img.shields.io/badge/rustc-1.66+-lightgray.svg
-[Rust 1.66]: https://blog.rust-lang.org/2022/12/15/Rust-1.66.0.html
+[borsh: rustc 1.67+]: https://img.shields.io/badge/rustc-1.67+-lightgray.svg
+[Rust 1.67]: https://blog.rust-lang.org/2023/01/26/Rust-1.67.0.html
 [License Apache-2.0 badge]: https://img.shields.io/badge/license-Apache2.0-blue.svg
 [License Apache-2.0]: https://opensource.org/licenses/Apache-2.0
 [License MIT badge]: https://img.shields.io/badge/license-MIT-blue.svg
diff --git a/borsh-derive/Cargo.toml b/borsh-derive/Cargo.toml
index 7e8c5a3ef..fb87bccf9 100644
--- a/borsh-derive/Cargo.toml
+++ b/borsh-derive/Cargo.toml
@@ -19,7 +19,7 @@ proc-macro = true
 
 [dependencies]
 syn = { version = "2", features = ["full", "fold"] }
-proc-macro-crate = "2"
+proc-macro-crate = "3"
 proc-macro2 = "1"
 quote = "1"
 once_cell = "1.18.0"