diff --git a/.github/workflows/cont_integration.yml b/.github/workflows/cont_integration.yml
index 754f52a..60d6905 100644
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -10,8 +10,8 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.56.1 # STABLE
-          - 1.46.0 # MSRV
+          - 1.60.0 # STABLE
+          - 1.56.0 # MSRV
         features:
           - default
           - electrum
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98f49f1..0fb4ff9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add experimental `regtest-*` features to automatically deploy local regtest nodes
 (bitcoind, and electrs) while running cli commands.
 - Put cached wallet data in separate directories: ~/.bdk-bitcoin/<wallet_name>
+- New MSRV set to `1.56`
 
 ## [0.4.0]
 
diff --git a/build.rs b/build.rs
index da76003..3a5bf28 100644
--- a/build.rs
+++ b/build.rs
@@ -22,8 +22,7 @@ fn main() {
 
     let database_features: Vec<String> = vec![key_value_db, sqlite_db]
         .iter()
-        .map(|f| f.to_owned())
-        .flatten()
+        .filter_map(|f| f.to_owned())
         .collect();
 
     if database_features.len() > 1 {