diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 7828b3c8..2e7d3d3a 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -15,7 +15,7 @@ jobs:
                     - rust: nightly
                       env:
                           RUSTFMTCHK: false
-                    - rust: 1.48.0
+                    - rust: 1.56.1
                       env:
                           RUSTFMTCHK: false
         steps:
diff --git a/README.md b/README.md
index e07e9395..278a8fdb 100644
--- a/README.md
+++ b/README.md
@@ -47,4 +47,4 @@ The following versions are officially supported and automatically tested:
 * 0.21.0
 
 # Minimum Supported Rust Version (MSRV)
-This library should always compile with any combination of features on **Rust 1.48.0**.
+This library should always compile with any combination of features on **Rust 1.56.1**.
diff --git a/client/Cargo.toml b/client/Cargo.toml
index 61e8870a..914e6a9f 100644
--- a/client/Cargo.toml
+++ b/client/Cargo.toml
@@ -12,7 +12,7 @@ repository = "https://github.com/rust-bitcoin/rust-bitcoincore-rpc/"
 description = "RPC client library for the Bitcoin Core JSON-RPC API."
 keywords = ["crypto", "bitcoin", "bitcoin-core", "rpc"]
 readme = "README.md"
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "bitcoincore_rpc"
diff --git a/contrib/test.sh b/contrib/test.sh
index 87c766d9..fe293ab8 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -13,14 +13,14 @@ if [ -n "$RUSTFMTCHECK" ]; then
   cargo fmt --all -- --check
 fi
 
-# Test pinned versions (these are from rust-bitcoin pinning for 1.48).
+# Test pinned versions (these are from rust-bitcoin pinning for 1.56.1).
 if cargo --version | grep ${MSRV}; then
     cargo update -p tempfile --precise 3.3.0
     cargo update -p log --precise 0.4.18
     cargo update -p serde_json --precise 1.0.99
     cargo update -p serde --precise 1.0.156
-    cargo update -p quote --precise 1.0.30
-    cargo update -p proc-macro2 --precise 1.0.63
+    cargo update -p quote --precise 1.0.35
+    cargo update -p proc-macro2 --precise 1.0.75
 fi
 
 # Integration test.
diff --git a/integration_test/Cargo.toml b/integration_test/Cargo.toml
index 014c3676..f5a6cd73 100644
--- a/integration_test/Cargo.toml
+++ b/integration_test/Cargo.toml
@@ -2,7 +2,7 @@
 name = "integration_test"
 version = "0.1.0"
 authors = ["Steven Roose <steven@stevenroose.org>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 bitcoincore-rpc = { path = "../client" }