diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index d1c3653da..94cbedd3e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,7 +15,7 @@ jobs:
       # failure only occurs on a particular version.
       fail-fast: false
       matrix:
-        rust: [stable, 1.46.0]
+        rust: [stable, 1.49.0]
     steps:
     - uses: actions/checkout@master
     - uses: actions-rs/toolchain@v1
@@ -68,7 +68,7 @@ jobs:
       # failure only occurs on a particular version.
       fail-fast: false
       matrix:
-        rust: [stable, beta, nightly, 1.46.0]
+        rust: [stable, beta, nightly, 1.49.0]
     steps:
     - uses: actions/checkout@master
     - uses: actions-rs/toolchain@v1
diff --git a/README.md b/README.md
index 401d0de15..31a2357a9 100644
--- a/README.md
+++ b/README.md
@@ -29,9 +29,11 @@ Tower aims to make it as easy as possible to build robust networking clients and
 servers. It is protocol agnostic, but is designed around a request / response
 pattern. If your protocol is entirely stream based, Tower may not be a good fit.
 
-## Minimum supported Rust version
+## Supported Rust Versions
 
-tower's MSRV is 1.46.
+Tower will keep a rolling MSRV (minimum supported Rust version) policy of **at
+least** 6 months. When increasing the MSRV, the new Rust version must have been
+released at least six months ago. The current MSRV is 1.49.0.
 
 ## Getting Started
 
diff --git a/tower/Cargo.toml b/tower/Cargo.toml
index 18fc694d0..a8f4d161d 100644
--- a/tower/Cargo.toml
+++ b/tower/Cargo.toml
@@ -20,6 +20,7 @@ clients and servers.
 categories = ["asynchronous", "network-programming"]
 keywords = ["io", "async", "non-blocking", "futures", "service"]
 edition = "2018"
+rust-version = "1.49.0"
 
 [features]
 default = ["log"]
diff --git a/tower/README.md b/tower/README.md
index e2f877d90..d8f6f4155 100644
--- a/tower/README.md
+++ b/tower/README.md
@@ -172,6 +172,13 @@ Tower.
 [`retry`]: https://docs.rs/tower/latest/tower/retry
 [open a PR]: https://github.com/tower-rs/tower/compare
 
+
+## Supported Rust Versions
+
+Tower will keep a rolling MSRV (minimum supported Rust version) policy of **at
+least** 6 months. When increasing the MSRV, the new Rust version must have been
+released at least six months ago. The current MSRV is 1.49.0.
+
 ## License
 
 This project is licensed under the [MIT license](LICENSE).
diff --git a/tower/src/lib.rs b/tower/src/lib.rs
index c7aa3c0be..c7f72cf99 100644
--- a/tower/src/lib.rs
+++ b/tower/src/lib.rs
@@ -140,6 +140,13 @@
 //! See [here](#modules) for a complete list of all middleware provided by
 //! Tower.
 //!
+//!
+//! #! Supported Rust Versions
+//!
+//! Tower will keep a rolling MSRV (minimum supported Rust version) policy of **at
+//! least** 6 months. When increasing the MSRV, the new Rust version must have been
+//! released at least six months ago. The current MSRV is 1.49.0.
+//!
 //! [`Service`]: crate::Service
 //! [`Layer`]: crate::Layer
 //! [timeouts]: crate::timeout