diff --git a/.cargo/config.toml b/.cargo/config.toml
index 2ac21485..4024bc0e 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -14,18 +14,10 @@ ci-check = "hack --workspace --feature-powerset --exclude-features=io-uring chec
 ci-check-linux = "hack --workspace --feature-powerset check --tests --examples"
 
 # tests avoiding io-uring feature
-ci-test = "       hack --feature-powerset --exclude=actix-rt --exclude=actix-server --exclude-features=io-uring test --workspace --lib --tests --no-fail-fast -- --nocapture"
-ci-test-rt = "    hack --feature-powerset --exclude-features=io-uring test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
-ci-test-server = "hack --feature-powerset --exclude-features=io-uring test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
+ci-test = "hack --feature-powerset --exclude-features=io-uring test --lib --tests --no-fail-fast -- --nocapture"
 
 # tests avoiding io-uring feature on Windows
-ci-test-win = "       hack --feature-powerset --depth 2 --exclude=actix-rt --exclude=actix-server --exclude-features=io-uring test --workspace --lib --tests --no-fail-fast -- --nocapture"
-ci-test-rt-win = "    hack --feature-powerset --depth 2 --exclude-features=io-uring test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
-ci-test-server-win = "hack --feature-powerset --depth 2 --exclude-features=io-uring test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
+ci-test-win = "hack --feature-powerset --depth 2 --exclude-features=io-uring test --lib --tests --no-fail-fast -- --nocapture"
 
 # test with io-uring feature
-ci-test-rt-linux = "    hack --feature-powerset test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
-ci-test-server-linux = "hack --feature-powerset test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
-
-# test lower msrv
-ci-test-lower-msrv = "hack --workspace --exclude=actix-server --exclude=actix-tls --feature-powerset test --lib --tests --no-fail-fast -- --nocapture"
+ci-test-linux = "    hack --feature-powerset test --lib --tests --no-fail-fast -- --nocapture"
diff --git a/.github/workflows/ci-master.yml b/.github/workflows/ci-master.yml
index 45e5683a..29c5d8c7 100644
--- a/.github/workflows/ci-master.yml
+++ b/.github/workflows/ci-master.yml
@@ -101,14 +101,11 @@ jobs:
         if: >
           matrix.target.os != 'ubuntu-latest'
           && matrix.target.triple != 'x86_64-pc-windows-gnu'
-        run: |
-          cargo ci-test
-          cargo ci-test-rt
-          cargo ci-test-server
+        run: cargo ci-test
       - name: tests
         if: matrix.target.os == 'ubuntu-latest'
         run: |
-          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rt-linux && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-server-linux"
+          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux"
 
       - name: Clear the cargo caches
         run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7b2343f6..fd839fb4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
           - { name: Windows (MinGW), os: windows-latest, triple: x86_64-pc-windows-gnu }
           - { name: Windows (32-bit), os: windows-latest, triple: i686-pc-windows-msvc }
         version:
-          - 1.52.0 # MSRV for -server and -tls
+          - 1.57.0
           - stable
 
     name: ${{ matrix.target.name }} / ${{ matrix.version }}
@@ -77,10 +77,6 @@ jobs:
         uses: actions-rs/cargo@v1
         with: { command: generate-lockfile }
 
-      - name: Tweak lockfile
-        run: |
-          cargo update -p=native-tls --precise=0.2.8
-
       - name: check lib
         if: >
           matrix.target.os != 'ubuntu-latest'
@@ -110,59 +106,16 @@ jobs:
 
       - name: tests
         if: matrix.target.os == 'macos-latest'
-        run: |
-          cargo ci-test
-          cargo ci-test-rt
-          cargo ci-test-server
+        run: cargo ci-test
       - name: tests
         if: >
           matrix.target.os == 'windows-latest'
           && matrix.target.triple != 'x86_64-pc-windows-gnu'
-        run: |
-          cargo ci-test-win
-          cargo ci-test-rt-win
-          cargo ci-test-server-win
+        run: cargo ci-test-win
       - name: tests
         if: matrix.target.os == 'ubuntu-latest'
         run: |
-          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rt-linux && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-server-linux"
-
-      - name: Clear the cargo caches
-        run: |
-          cargo install cargo-cache --version 0.6.2 --no-default-features --features ci-autoclean
-          cargo-cache
-
-  build_and_test_lower_msrv:
-    name: Linux / 1.49 (lower MSRV)
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Install 1.49.0 # MSRV for all but -server and -tls
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.49.0-x86_64-unknown-linux-gnu
-          profile: minimal
-          override: true
-
-      - name: Install cargo-hack
-        uses: actions-rs/cargo@v1
-        with:
-          command: install
-          args: cargo-hack
-
-      - name: Generate Cargo.lock
-        uses: actions-rs/cargo@v1
-        with: { command: generate-lockfile }
-
-      - name: Tweak lockfile
-        run: |
-          cargo update -p=rustls --precise=0.20.2
-          cargo update -p=native-tls --precise=0.2.8
-
-      - name: tests
-        run: |
-          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=1.49 cargo ci-test-lower-msrv"
+          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux"
 
       - name: Clear the cargo caches
         run: |
diff --git a/actix-codec/CHANGES.md b/actix-codec/CHANGES.md
index c721762d..2de0bcf6 100644
--- a/actix-codec/CHANGES.md
+++ b/actix-codec/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 0.5.1 - 2022-03-15
diff --git a/actix-macros/CHANGES.md b/actix-macros/CHANGES.md
index accc52ce..9a25f7ed 100644
--- a/actix-macros/CHANGES.md
+++ b/actix-macros/CHANGES.md
@@ -1,7 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
-- Minimum supported Rust version (MSRV) is now 1.49.
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 0.2.3 - 2021-10-19
diff --git a/actix-rt/CHANGES.md b/actix-rt/CHANGES.md
index 4715a4b5..b19b2b7d 100644
--- a/actix-rt/CHANGES.md
+++ b/actix-rt/CHANGES.md
@@ -2,6 +2,7 @@
 
 ## Unreleased - 2022-xx-xx
 - Add `#[track_caller]` attribute to `spawn` functions and methods. [#454]
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 [#454]: https://github.com/actix/actix-net/pull/454
 
diff --git a/actix-server/CHANGES.md b/actix-server/CHANGES.md
index f8e29d33..1fdb63fd 100644
--- a/actix-server/CHANGES.md
+++ b/actix-server/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 2.1.1 - 2022-03-09
diff --git a/actix-server/src/accept.rs b/actix-server/src/accept.rs
index a6ae78c1..c250f909 100644
--- a/actix-server/src/accept.rs
+++ b/actix-server/src/accept.rs
@@ -24,7 +24,7 @@ struct ServerSocketInfo {
     timeout: Option<actix_rt::time::Instant>,
 }
 
-/// poll instance of the server.
+/// Poll instance of the server.
 pub(crate) struct Accept {
     poll: Poll,
     waker_queue: WakerQueue,
@@ -161,11 +161,13 @@ impl Accept {
         // a loop that would try to drain the command channel. It's yet unknown
         // if it's necessary/good practice to actively drain the waker queue.
         loop {
-            // take guard with every iteration so no new interest can be added
-            // until the current task is done.
+            // Take guard with every iteration so no new interests can be added until the current
+            // task is done. Take care not to take the guard again inside this loop.
             let mut guard = self.waker_queue.guard();
+
+            #[allow(clippy::significant_drop_in_scrutinee)]
             match guard.pop_front() {
-                // worker notify it becomes available.
+                // Worker notified it became available.
                 Some(WakerInterest::WorkerAvailable(idx)) => {
                     drop(guard);
 
@@ -176,7 +178,7 @@ impl Accept {
                     }
                 }
 
-                // a new worker thread is made and it's handle would be added to Accept
+                // A new worker thread has been created so store its handle.
                 Some(WakerInterest::Worker(handle)) => {
                     drop(guard);
 
diff --git a/actix-service/CHANGES.md b/actix-service/CHANGES.md
index 36c6fba5..5f4d5086 100644
--- a/actix-service/CHANGES.md
+++ b/actix-service/CHANGES.md
@@ -1,7 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
-- Minimum supported Rust version (MSRV) is now 1.49.
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 2.0.2 - 2021-12-18
diff --git a/actix-tls/CHANGES.md b/actix-tls/CHANGES.md
index cf36d96c..a4b7c75a 100644
--- a/actix-tls/CHANGES.md
+++ b/actix-tls/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 3.0.4 - 2022-03-15
diff --git a/actix-tls/src/connect/host.rs b/actix-tls/src/connect/host.rs
index 13780751..c4ff9a01 100644
--- a/actix-tls/src/connect/host.rs
+++ b/actix-tls/src/connect/host.rs
@@ -27,25 +27,25 @@ pub trait Host: Unpin + 'static {
 
 impl Host for String {
     fn hostname(&self) -> &str {
-        str_split_once(self, ':')
+        self.split_once(':')
             .map(|(hostname, _)| hostname)
             .unwrap_or(self)
     }
 
     fn port(&self) -> Option<u16> {
-        str_split_once(self, ':').and_then(|(_, port)| port.parse().ok())
+        self.split_once(':').and_then(|(_, port)| port.parse().ok())
     }
 }
 
 impl Host for &'static str {
     fn hostname(&self) -> &str {
-        str_split_once(self, ':')
+        self.split_once(':')
             .map(|(hostname, _)| hostname)
             .unwrap_or(self)
     }
 
     fn port(&self) -> Option<u16> {
-        str_split_once(self, ':').and_then(|(_, port)| port.parse().ok())
+        self.split_once(':').and_then(|(_, port)| port.parse().ok())
     }
 }
 
@@ -69,11 +69,3 @@ mod tests {
         assert_connection_info_eq!("example.com:false:false", "example.com", None);
     }
 }
-
-// `str::split_once` is stabilized in 1.52.0
-fn str_split_once(str: &str, delimiter: char) -> Option<(&str, &str)> {
-    let mut splitn = str.splitn(2, delimiter);
-    let prefix = splitn.next()?;
-    let suffix = splitn.next()?;
-    Some((prefix, suffix))
-}
diff --git a/actix-tracing/CHANGES.md b/actix-tracing/CHANGES.md
index aecc837c..e4396377 100644
--- a/actix-tracing/CHANGES.md
+++ b/actix-tracing/CHANGES.md
@@ -1,7 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
-- Minimum supported Rust version (MSRV) is now 1.49.
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 0.1.0 - 2020-01-15
diff --git a/actix-utils/CHANGES.md b/actix-utils/CHANGES.md
index 6657000b..0602b27d 100644
--- a/actix-utils/CHANGES.md
+++ b/actix-utils/CHANGES.md
@@ -1,7 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
-- Minimum supported Rust version (MSRV) is now 1.49.
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 3.0.0 - 2021-04-16
diff --git a/bytestring/CHANGES.md b/bytestring/CHANGES.md
index aaf6996c..2cdf6d91 100644
--- a/bytestring/CHANGES.md
+++ b/bytestring/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 1.1.0 - 2022-06-11
diff --git a/bytestring/src/lib.rs b/bytestring/src/lib.rs
index 39a153d2..27357602 100644
--- a/bytestring/src/lib.rs
+++ b/bytestring/src/lib.rs
@@ -72,7 +72,7 @@ impl AsRef<[u8]> for ByteString {
 
 impl AsRef<str> for ByteString {
     fn as_ref(&self) -> &str {
-        &*self
+        self
     }
 }
 
@@ -96,7 +96,7 @@ impl ops::Deref for ByteString {
 
 impl borrow::Borrow<str> for ByteString {
     fn borrow(&self) -> &str {
-        &*self
+        self
     }
 }
 
diff --git a/clippy.toml b/clippy.toml
index f691ea3d..5cccb362 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1 +1 @@
-msrv = "1.48"
+msrv = "1.57"
diff --git a/local-channel/CHANGES.md b/local-channel/CHANGES.md
index a0ef93fc..1b273273 100644
--- a/local-channel/CHANGES.md
+++ b/local-channel/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 0.1.3 - 2022-05-03
diff --git a/local-waker/CHANGES.md b/local-waker/CHANGES.md
index f178a40b..bedfbea6 100644
--- a/local-waker/CHANGES.md
+++ b/local-waker/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Minimum supported Rust version (MSRV) is now 1.57.
 
 
 ## 0.1.3 - 2022-05-03