diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 617364e..fa6a584 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -15,28 +15,27 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ["stable", "nightly"]
+        version: ['stable', 'nightly']
+
+    env:
+      # included in example of redis, not clear its purpose
+      CI: true
 
     steps:
       - uses: actions/checkout@v2
 
-      - name: cache cargo artifacts
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            ./target/debug
-          key: cargo-linux-${{ matrix.version }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            cargo-linux-${{ matrix.version }}-
-
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
           toolchain: ${{ matrix.version }}
           override: true
 
+      - name: Generate Cargo.lock
+        uses: actions-rs/cargo@v1
+        with: { command: generate-lockfile }
+      - name: Cache Dependencies
+        uses: Swatinem/rust-cache@v1.2.0
+
       - name: create test db for sqlx
         run: |
           sudo apt-get update && sudo apt-get install sqlite3
@@ -50,7 +49,8 @@ jobs:
         timeout-minutes: 30
         with:
           command: check
-          args: --workspace --bins --examples --tests
+          # TODO: remove exclude protobuf-example when upgraded; currently fails on nightly
+          args: --workspace --bins --examples --tests --exclude protobuf-example
 
       - name: start redis
         uses: supercharge/redis-github-action@1.1.0
@@ -67,9 +67,7 @@ jobs:
       - name: cargo test
         uses: actions-rs/cargo@v1
         timeout-minutes: 30
-        env:
-          # included in example of redis, not clear its purpose
-          CI: true
         with:
           command: test
-          args: --workspace --all-features --no-fail-fast -- --nocapture
+          # TODO: remove exclude protobuf-example when upgraded; currently fails on nightly
+          args: --workspace --all-features --no-fail-fast --exclude protobuf-example -- --nocapture
diff --git a/Cargo.lock b/Cargo.lock
index b2664be..73917c3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -384,7 +384,7 @@ version = "0.5.0-beta.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "36b95ce0d76d1aa2f98b681702807475ade0f99bd4552546a6843a966d42ea3d"
 dependencies = [
- "bytestring 0.1.5",
+ "bytestring 1.0.0",
  "firestorm",
  "http",
  "log",
@@ -2502,6 +2502,19 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
+dependencies = [
+ "atty",
+ "humantime 2.0.1",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.12.4"
@@ -4624,7 +4637,7 @@ dependencies = [
  "actix-protobuf",
  "actix-web 3.3.1",
  "bytes 0.5.6",
- "env_logger 0.7.1",
+ "env_logger 0.9.0",
  "prost",
  "prost-derive",
 ]
diff --git a/database_interactions/sqlx_todo/.gitignore b/database_interactions/sqlx_todo/.gitignore
index ef82c96..348583b 100644
--- a/database_interactions/sqlx_todo/.gitignore
+++ b/database_interactions/sqlx_todo/.gitignore
@@ -1,3 +1,3 @@
 /target
 .env
-test.db
+test.db*
diff --git a/database_interactions/sqlx_todo/Cargo.toml b/database_interactions/sqlx_todo/Cargo.toml
index b256311..d5baefb 100644
--- a/database_interactions/sqlx_todo/Cargo.toml
+++ b/database_interactions/sqlx_todo/Cargo.toml
@@ -11,7 +11,7 @@ actix-web = "3"
 listenfd = "0.3.3"
 serde = "1.0.106"
 serde_json = "1.0.51"
-sqlx = { version = "0.3", features = [ "sqlite" ] }
+sqlx = { version = "0.3", features = ["sqlite"] }
 dotenv = "0.15.0"
 env_logger = "0.7.1"
 log = "0.4.8"
diff --git a/other/protobuf/Cargo.toml b/other/protobuf/Cargo.toml
index 4550a36..eec02b4 100644
--- a/other/protobuf/Cargo.toml
+++ b/other/protobuf/Cargo.toml
@@ -5,11 +5,11 @@ authors = ["kingxsp <jin.hb.zh@outlook.com>, Yuki Okushi <huyuumi.dev@gmail.com>
 edition = "2018"
 
 [dependencies]
-bytes = "0.5.4"
-env_logger = "0.7.1"
-prost = "0.6.1"
-prost-derive = "0.6.1"
-
 actix = "0.10"
 actix-protobuf = "0.6"
 actix-web = "3"
+
+bytes = "0.5.4"
+env_logger = "0.9"
+prost = "0.6"
+prost-derive = "0.6"
diff --git a/other/protobuf/src/main.rs b/other/protobuf/src/main.rs
index fdd7c8a..e8cc79f 100644
--- a/other/protobuf/src/main.rs
+++ b/other/protobuf/src/main.rs
@@ -1,8 +1,8 @@
 #[macro_use]
 extern crate prost_derive;
 
-use actix_protobuf::*;
-use actix_web::*;
+use actix_protobuf::{ProtoBuf, ProtoBufResponseBuilder as _};
+use actix_web::{middleware, web, App, HttpResponse, HttpServer, Result};
 
 #[derive(Clone, PartialEq, Message)]
 pub struct MyObj {