diff --git a/.github/workflows/check_msrv.yml b/.github/workflows/check_msrv.yml
index 155b28a717..be257bfd30 100644
--- a/.github/workflows/check_msrv.yml
+++ b/.github/workflows/check_msrv.yml
@@ -30,24 +30,24 @@ env:
 
 jobs:
   check-msrv:
-    # Run `cargo check` on our minimum supported Rust version (1.42.0).
+    # Run `cargo check` on our minimum supported Rust version (1.49.0).
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@main
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.42.0
+        toolchain: 1.49.0
         profile: minimal
         override: true
     - name: Check
       uses: actions-rs/cargo@v1
       with:
         command: check
-        args: --all --exclude=tracing-appender --exclude=tracing-opentelemetry
+        args: --all --exclude=tracing-appender
 
   # TODO: remove this once tracing's MSRV is bumped.
   check-msrv-appender:
-    # Run `cargo check` on our minimum supported Rust version (1.51.0).
+    # Run `cargo check` on our minimum supported Rust version (1.53.0).
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@main
@@ -60,21 +60,4 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: check
-        args: --lib=tracing-appender
-
-  # TODO: remove this once tracing's MSRV is bumped.
-  check-msrv-opentelemetry:
-    # Run `cargo check` on our minimum supported Rust version (1.46.0).
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@main
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: 1.46.0
-        profile: minimal
-        override: true
-    - name: Check
-      uses: actions-rs/cargo@v1
-      with:
-        command: check
-        args: --package=tracing-opentelemetry
+        args: --lib=tracing-appender
\ No newline at end of file
diff --git a/README.md b/README.md
index 0cc11e8a80..be5e7b00d6 100644
--- a/README.md
+++ b/README.md
@@ -254,7 +254,7 @@ attachment that `Future::instrument` does.
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/examples/Cargo.toml b/examples/Cargo.toml
index 83709f8f92..6abbf6f969 100644
--- a/examples/Cargo.toml
+++ b/examples/Cargo.toml
@@ -3,7 +3,7 @@ name = "tracing-examples"
 version = "0.0.0"
 publish = false
 edition = "2018"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = []
diff --git a/tracing-attributes/Cargo.toml b/tracing-attributes/Cargo.toml
index 4079984ac7..3b6ce3dc27 100644
--- a/tracing-attributes/Cargo.toml
+++ b/tracing-attributes/Cargo.toml
@@ -28,7 +28,7 @@ keywords = ["logging", "tracing", "macro", "instrument", "log"]
 license = "MIT"
 readme = "README.md"
 edition = "2018"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [lib]
 proc-macro = true
diff --git a/tracing-attributes/README.md b/tracing-attributes/README.md
index 64f1527f26..efb8b50ebd 100644
--- a/tracing-attributes/README.md
+++ b/tracing-attributes/README.md
@@ -37,7 +37,7 @@ structured, event-based diagnostic information. This crate provides the
 
 Note that this macro is also re-exported by the main `tracing` crate.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -69,7 +69,7 @@ pub fn my_function(my_arg: usize) {
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-attributes/src/lib.rs b/tracing-attributes/src/lib.rs
index 867800d4b5..335245fc9d 100644
--- a/tracing-attributes/src/lib.rs
+++ b/tracing-attributes/src/lib.rs
@@ -6,7 +6,7 @@
 //!
 //! Note that this macro is also re-exported by the main `tracing` crate.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -41,7 +41,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-core/Cargo.toml b/tracing-core/Cargo.toml
index 69e5f4ced3..d9536aaeca 100644
--- a/tracing-core/Cargo.toml
+++ b/tracing-core/Cargo.toml
@@ -24,7 +24,7 @@ categories = [
 ]
 keywords = ["logging", "tracing", "profiling"]
 edition = "2018"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["std"]
diff --git a/tracing-core/README.md b/tracing-core/README.md
index edc5251c9c..189d4f66f6 100644
--- a/tracing-core/README.md
+++ b/tracing-core/README.md
@@ -53,7 +53,7 @@ The crate provides:
 In addition, it defines the global callsite registry and per-thread current
 dispatcher which other components of the tracing system rely on.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -99,7 +99,7 @@ The following crate feature flags are available:
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-core/src/lib.rs b/tracing-core/src/lib.rs
index 01451513b5..41390c07ad 100644
--- a/tracing-core/src/lib.rs
+++ b/tracing-core/src/lib.rs
@@ -23,7 +23,7 @@
 //! In addition, it defines the global callsite registry and per-thread current
 //! dispatcher which other components of the tracing system rely on.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -109,7 +109,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-core/src/spin/once.rs b/tracing-core/src/spin/once.rs
index 8643d472b2..27c99e56ee 100644
--- a/tracing-core/src/spin/once.rs
+++ b/tracing-core/src/spin/once.rs
@@ -1,9 +1,7 @@
 use core::cell::UnsafeCell;
 use core::fmt;
+use core::hint::spin_loop;
 use core::sync::atomic::{AtomicUsize, Ordering};
-// TODO(eliza): replace with `core::hint::spin_loop` once our MSRV supports it.
-#[allow(deprecated)]
-use core::sync::atomic::spin_loop_hint as cpu_relax;
 
 /// A synchronization primitive which can be used to run a one-time global
 /// initialization. Unlike its std equivalent, this is generalized so that the
@@ -109,10 +107,8 @@ impl<T> Once<T> {
             match status {
                 INCOMPLETE => unreachable!(),
                 RUNNING => {
-                    // TODO(eliza): replace with `core::hint::spin_loop` once our MSRV supports it.
-                    #[allow(deprecated)]
                     // We spin
-                    cpu_relax();
+                    spin_loop();
                     status = self.state.load(Ordering::SeqCst)
                 }
                 PANICKED => panic!("Once has panicked"),
@@ -138,9 +134,7 @@ impl<T> Once<T> {
                 INCOMPLETE => return None,
 
                 RUNNING => {
-                    // TODO(eliza): replace with `core::hint::spin_loop` once our MSRV supports it.
-                    #[allow(deprecated)]
-                    cpu_relax() // We spin
+                    spin_loop() // We spin
                 }
                 COMPLETE => return Some(self.force_get()),
                 PANICKED => panic!("Once has panicked"),
diff --git a/tracing-error/Cargo.toml b/tracing-error/Cargo.toml
index 24ddea1988..190f791bb6 100644
--- a/tracing-error/Cargo.toml
+++ b/tracing-error/Cargo.toml
@@ -32,7 +32,7 @@ keywords = [
     "backtrace"
 ]
 edition = "2018"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["traced-error"]
diff --git a/tracing-error/README.md b/tracing-error/README.md
index 8e99f1c918..7a625ca296 100644
--- a/tracing-error/README.md
+++ b/tracing-error/README.md
@@ -48,7 +48,7 @@ The crate provides the following:
 
 **Note**: This crate is currently experimental.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -186,7 +186,7 @@ fn main() {
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-error/src/lib.rs b/tracing-error/src/lib.rs
index 7666ff8314..6499e23fa7 100644
--- a/tracing-error/src/lib.rs
+++ b/tracing-error/src/lib.rs
@@ -18,7 +18,7 @@
 //!
 //! **Note**: This crate is currently experimental.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -166,7 +166,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-flame/Cargo.toml b/tracing-flame/Cargo.toml
index ec9bb34f08..a37dde7c2f 100644
--- a/tracing-flame/Cargo.toml
+++ b/tracing-flame/Cargo.toml
@@ -19,7 +19,7 @@ categories = [
     "asynchronous",
 ]
 keywords = ["tracing", "subscriber", "flamegraph", "profiling"]
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["smallvec"]
diff --git a/tracing-flame/README.md b/tracing-flame/README.md
index 0fcdc3a089..46340ed541 100644
--- a/tracing-flame/README.md
+++ b/tracing-flame/README.md
@@ -26,7 +26,7 @@ flamegraph/flamechart. Flamegraphs/flamecharts are useful for identifying perfor
 bottlenecks in an application. For more details, see Brendan Gregg's [post]
 on flamegraphs.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 [post]: http://www.brendangregg.com/flamegraphs.html
@@ -106,7 +106,7 @@ _flamechart_, which _does not_ sort or collapse identical stack frames.
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-flame/src/lib.rs b/tracing-flame/src/lib.rs
index ea283935f5..63694f14da 100644
--- a/tracing-flame/src/lib.rs
+++ b/tracing-flame/src/lib.rs
@@ -10,7 +10,7 @@
 //! issues bottlenecks in an application. For more details, see Brendan Gregg's [post]
 //! on flamegraphs.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //! [post]: http://www.brendangregg.com/flamegraphs.html
@@ -95,7 +95,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-futures/Cargo.toml b/tracing-futures/Cargo.toml
index a58a0e0de5..c330c75a51 100644
--- a/tracing-futures/Cargo.toml
+++ b/tracing-futures/Cargo.toml
@@ -16,7 +16,7 @@ categories = [
 ]
 keywords = ["logging", "profiling", "tracing", "futures", "async"]
 license = "MIT"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["std-future", "std"]
diff --git a/tracing-futures/README.md b/tracing-futures/README.md
index c0b008faa2..c27248cfa3 100644
--- a/tracing-futures/README.md
+++ b/tracing-futures/README.md
@@ -51,14 +51,14 @@ The crate provides the following traits:
 [`Subscriber`]: https://docs.rs/tracing/latest/tracing/subscriber/index.html
 [`tracing`]: https://crates.io/crates/tracing
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-futures/src/lib.rs b/tracing-futures/src/lib.rs
index 09960ee31a..49a3a1990e 100644
--- a/tracing-futures/src/lib.rs
+++ b/tracing-futures/src/lib.rs
@@ -15,7 +15,7 @@
 //! * [`WithCollector`] allows a `tracing` [collector] to be attached to a
 //!   future, sink, stream, or executor.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -60,7 +60,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-journald/Cargo.toml b/tracing-journald/Cargo.toml
index 28ac9a0437..987797a55d 100644
--- a/tracing-journald/Cargo.toml
+++ b/tracing-journald/Cargo.toml
@@ -13,7 +13,7 @@ categories = [
     "development-tools::profiling",
 ]
 keywords = ["tracing", "journald"]
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [dependencies]
 libc = "0.2.107"
diff --git a/tracing-journald/README.md b/tracing-journald/README.md
index 5194e3ec4d..76d3d4c0d7 100644
--- a/tracing-journald/README.md
+++ b/tracing-journald/README.md
@@ -28,7 +28,7 @@ scoped, structured, and async-aware diagnostics. `tracing-journald` provides a
 and events to [`systemd-journald`][journald], on Linux distributions that use
 `systemd`.
  
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 [`tracing`]: https://crates.io/crates/tracing
@@ -38,7 +38,7 @@ and events to [`systemd-journald`][journald], on Linux distributions that use
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-journald/src/lib.rs b/tracing-journald/src/lib.rs
index 8683143b02..ef005ee47d 100644
--- a/tracing-journald/src/lib.rs
+++ b/tracing-journald/src/lib.rs
@@ -11,7 +11,7 @@
 //! and events to [`systemd-journald`][journald], on Linux distributions that
 //! use `systemd`.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //! [`tracing`]: https://crates.io/crates/tracing
@@ -21,7 +21,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-log/Cargo.toml b/tracing-log/Cargo.toml
index 09cdf8cfc4..f686be2351 100644
--- a/tracing-log/Cargo.toml
+++ b/tracing-log/Cargo.toml
@@ -15,7 +15,7 @@ categories = [
 keywords = ["logging", "tracing", "log"]
 license = "MIT"
 readme = "README.md"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["log-tracer", "std"]
diff --git a/tracing-log/README.md b/tracing-log/README.md
index 6ee18175ad..1cfee3681d 100644
--- a/tracing-log/README.md
+++ b/tracing-log/README.md
@@ -56,14 +56,14 @@ This crate provides:
 [`tracing::Subscriber`]: https://docs.rs/tracing/latest/tracing/trait.Subscriber.html
 [`tracing::Event`]: https://docs.rs/tracing/latest/tracing/struct.Event.html
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-log/src/lib.rs b/tracing-log/src/lib.rs
index 292d3c5940..242784eb63 100644
--- a/tracing-log/src/lib.rs
+++ b/tracing-log/src/lib.rs
@@ -16,7 +16,7 @@
 //! - An [`env_logger`] module, with helpers for using the [`env_logger` crate]
 //!   with `tracing` (optional, enabled by the `env-logger` feature).
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -76,7 +76,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-macros/Cargo.toml b/tracing-macros/Cargo.toml
index 23458fced4..3d15aee3b6 100644
--- a/tracing-macros/Cargo.toml
+++ b/tracing-macros/Cargo.toml
@@ -15,7 +15,7 @@ categories = [
 ]
 keywords = ["logging", "tracing"]
 license = "MIT"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [dependencies]
 tracing = { path = "../tracing", version = "0.2", default-features = false, features = ["std"] }
diff --git a/tracing-opentelemetry/README.md b/tracing-opentelemetry/README.md
index d5bea68a94..b3e94f5ee2 100644
--- a/tracing-opentelemetry/README.md
+++ b/tracing-opentelemetry/README.md
@@ -50,7 +50,7 @@ The crate provides the following types:
 [`tracing`]: https://crates.io/crates/tracing
 [OpenTelemetry]: https://opentelemetry.io/
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
diff --git a/tracing-opentelemetry/src/lib.rs b/tracing-opentelemetry/src/lib.rs
index ba4a4f914e..dec950cfaa 100644
--- a/tracing-opentelemetry/src/lib.rs
+++ b/tracing-opentelemetry/src/lib.rs
@@ -9,7 +9,7 @@
 //! [OpenTelemetry]: https://opentelemetry.io
 //! [`tracing`]: https://github.com/tokio-rs/tracing
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -79,7 +79,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-serde/Cargo.toml b/tracing-serde/Cargo.toml
index 7352ff625f..b2b02baa71 100644
--- a/tracing-serde/Cargo.toml
+++ b/tracing-serde/Cargo.toml
@@ -16,7 +16,7 @@ categories = [
     "encoding",
 ]
 keywords = ["logging", "tracing", "serialization"]
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["std"]
diff --git a/tracing-serde/README.md b/tracing-serde/README.md
index deb4f8bb64..f02a880428 100644
--- a/tracing-serde/README.md
+++ b/tracing-serde/README.md
@@ -36,7 +36,7 @@ and tracing data to monitor your services in production.
 The `tracing` crate provides the APIs necessary for instrumenting
 libraries and applications to emit trace data.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -113,7 +113,7 @@ The following crate feature flags are available:
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-serde/src/lib.rs b/tracing-serde/src/lib.rs
index a5471af515..5a90ee5fa5 100644
--- a/tracing-serde/src/lib.rs
+++ b/tracing-serde/src/lib.rs
@@ -32,7 +32,7 @@
 //! The `tracing` crate provides the APIs necessary for instrumenting
 //! libraries and applications to emit trace data.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -128,7 +128,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-subscriber/Cargo.toml b/tracing-subscriber/Cargo.toml
index 76e7619c18..978e12bc40 100644
--- a/tracing-subscriber/Cargo.toml
+++ b/tracing-subscriber/Cargo.toml
@@ -20,7 +20,7 @@ categories = [
     "asynchronous",
 ]
 keywords = ["logging", "tracing", "metrics", "subscriber"]
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 
diff --git a/tracing-subscriber/README.md b/tracing-subscriber/README.md
index d01fac3e26..b6d198c8b4 100644
--- a/tracing-subscriber/README.md
+++ b/tracing-subscriber/README.md
@@ -32,14 +32,14 @@ Utilities for implementing and composing [`tracing`][tracing] subscribers.
 [discord-url]: https://discord.gg/EeF3cQw
 [maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-subscriber/src/fmt/mod.rs b/tracing-subscriber/src/fmt/mod.rs
index e6c8345461..32c9ad53d5 100644
--- a/tracing-subscriber/src/fmt/mod.rs
+++ b/tracing-subscriber/src/fmt/mod.rs
@@ -16,7 +16,7 @@
 //! tracing-subscriber = "0.3"
 //! ```
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: ../index.html#supported-rust-versions
 //!
diff --git a/tracing-subscriber/src/lib.rs b/tracing-subscriber/src/lib.rs
index 490dc92b0f..34b17d4e53 100644
--- a/tracing-subscriber/src/lib.rs
+++ b/tracing-subscriber/src/lib.rs
@@ -10,7 +10,7 @@
 //! `tracing-subscriber` is intended for use by both `Collector` authors and
 //! application authors using `tracing` to instrument their applications.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -81,7 +81,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing-tower/Cargo.toml b/tracing-tower/Cargo.toml
index 9c8765c817..a343939f5c 100644
--- a/tracing-tower/Cargo.toml
+++ b/tracing-tower/Cargo.toml
@@ -15,7 +15,7 @@ categories = [
 ]
 keywords = ["logging", "tracing"]
 license = "MIT"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [features]
 default = ["tower-layer", "tower-make"]
diff --git a/tracing/Cargo.toml b/tracing/Cargo.toml
index cbd7981fb9..c72f891c3a 100644
--- a/tracing/Cargo.toml
+++ b/tracing/Cargo.toml
@@ -28,7 +28,7 @@ categories = [
 ]
 keywords = ["logging", "tracing", "metrics", "async"]
 edition = "2018"
-rust-version = "1.42.0"
+rust-version = "1.49.0"
 
 [dependencies]
 tracing-core = { path = "../tracing-core", version = "0.2", default-features = false }
diff --git a/tracing/README.md b/tracing/README.md
index 199b437643..136dba8139 100644
--- a/tracing/README.md
+++ b/tracing/README.md
@@ -47,7 +47,7 @@ data as well as textual messages.
 The `tracing` crate provides the APIs necessary for instrumenting libraries
 and applications to emit trace data.
 
-*Compiler support: [requires `rustc` 1.42+][msrv]*
+*Compiler support: [requires `rustc` 1.49+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -420,7 +420,7 @@ undergoing active development. They may be less stable than `tracing` and
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio
diff --git a/tracing/src/lib.rs b/tracing/src/lib.rs
index 087951b566..adc3ce6fc3 100644
--- a/tracing/src/lib.rs
+++ b/tracing/src/lib.rs
@@ -19,7 +19,7 @@
 //! The `tracing` crate provides the APIs necessary for instrumenting libraries
 //! and applications to emit trace data.
 //!
-//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//! *Compiler support: [requires `rustc` 1.49+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //! # Core Concepts
@@ -868,7 +868,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! version is 1.49. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio