diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2de7e23..19cdd28 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.31.0, stable, beta, nightly]
+        rust: [1.56.0, stable, beta, nightly]
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@1.62.0
+      - uses: dtolnay/rust-toolchain@1.70.0
         with:
           components: rustfmt
       - run: cargo fmt --all --check
diff --git a/.github/workflows/master.yaml b/.github/workflows/master.yaml
index 98e8f8e..f23d140 100644
--- a/.github/workflows/master.yaml
+++ b/.github/workflows/master.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.31.0, stable]
+        rust: [1.56.0, stable]
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index d221a73..e195455 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.31.0, stable]
+        rust: [1.56.0, stable]
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@1.62.0
+      - uses: dtolnay/rust-toolchain@1.70.0
         with:
           components: rustfmt
       - run: cargo fmt --all --check
diff --git a/Cargo.toml b/Cargo.toml
index faaf55d..0a16ebc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,6 +12,7 @@ version = "0.3.3"
 readme = "README.md"
 exclude = ["/bors.toml", "/ci/*", "/.github/*"]
 edition = "2018"
+rust-version = "1.56.0"
 
 [dependencies]
 proc-macro2 = "1"
diff --git a/README.md b/README.md
index 9826cdf..3fb9498 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![crate](https://img.shields.io/crates/v/num-derive.svg)](https://crates.io/crates/num-derive)
 [![documentation](https://docs.rs/num-derive/badge.svg)](https://docs.rs/num-derive)
-[![minimum rustc 1.31](https://img.shields.io/badge/rustc-1.31+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
+[![minimum rustc 1.56](https://img.shields.io/badge/rustc-1.56+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
 [![build status](https://github.com/rust-num/num-derive/workflows/master/badge.svg)](https://github.com/rust-num/num-derive/actions)
 
 Procedural macros to derive numeric traits in Rust.
@@ -51,7 +51,7 @@ Release notes are available in [RELEASES.md](RELEASES.md).
 
 ## Compatibility
 
-The `num-derive` crate is tested for rustc 1.31 and greater.
+The `num-derive` crate is tested for rustc 1.56 and greater.
 
 ## License
 
diff --git a/bors.toml b/bors.toml
index 4c20337..f44ffa3 100644
--- a/bors.toml
+++ b/bors.toml
@@ -1,5 +1,5 @@
 status = [
-  "Test (1.31.0)",
+  "Test (1.56.0)",
   "Test (stable)",
   "Test (beta)",
   "Test (nightly)",
diff --git a/ci/rustup.sh b/ci/rustup.sh
index fed3e45..5289138 100755
--- a/ci/rustup.sh
+++ b/ci/rustup.sh
@@ -5,6 +5,6 @@
 set -ex
 
 ci=$(dirname $0)
-for version in 1.31.0 stable beta nightly; do
+for version in 1.56.0 stable beta nightly; do
     rustup run "$version" "$ci/test_full.sh"
 done
diff --git a/ci/test_full.sh b/ci/test_full.sh
index a6b7b3c..d3fe896 100755
--- a/ci/test_full.sh
+++ b/ci/test_full.sh
@@ -3,7 +3,7 @@
 set -e
 
 CRATE=num-derive
-MSRV=1.31
+MSRV=1.56
 
 get_rust_version() {
   local array=($(rustc --version));