diff --git a/Cargo.lock b/Cargo.lock
index 29a16f4..dda6ab1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -334,12 +334,6 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
-[[package]]
-name = "anyhow"
-version = "1.0.33"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1fd36ffbb1fb7c834eac128ea8d0e310c5aeb635548f9d58861e1308d46e71c"
-
 [[package]]
 name = "arc-swap"
 version = "0.4.7"
@@ -529,7 +523,6 @@ version = "0.1.0"
 dependencies = [
  "actix-rt",
  "actix-web",
- "anyhow",
  "chrono",
  "config",
  "reqwest",
@@ -545,7 +538,6 @@ version = "0.1.0"
 dependencies = [
  "actix-rt",
  "actix-web",
- "anyhow",
  "chrono",
  "config",
  "lazy_static",
diff --git a/chapter03-1/Cargo.toml b/chapter03-1/Cargo.toml
index f8fcc53..43bae14 100644
--- a/chapter03-1/Cargo.toml
+++ b/chapter03-1/Cargo.toml
@@ -19,7 +19,6 @@ tokio = "0.2.22"
 serde = "1.0.115"
 config = { version = "0.10.1", default-features = false, features = ["yaml"] }
 sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runtime-tokio", "macros", "postgres", "uuid", "chrono", "migrate"] }
-anyhow = "1.0.32"
 uuid = { version = "0.8.1", features = ["v4"] }
 chrono = "0.4.15"
 
diff --git a/chapter03-1/src/main.rs b/chapter03-1/src/main.rs
index 722760f..b4f54f4 100644
--- a/chapter03-1/src/main.rs
+++ b/chapter03-1/src/main.rs
@@ -1,16 +1,14 @@
-use anyhow::Context;
 use chapter03_1::configuration::get_configuration;
 use chapter03_1::startup::run;
 use sqlx::postgres::PgPool;
 use std::net::TcpListener;
 
 #[actix_rt::main]
-async fn main() -> Result<(), anyhow::Error> {
+async fn main() -> std::io::Result<()> {
     let configuration = get_configuration().expect("Failed to read configuration.");
     let connection_pool = PgPool::connect(&configuration.database.connection_string())
         .await
-        .map_err(anyhow::Error::from)
-        .with_context(|| "Failed to connect to Postgres.")?;
+        .expect("Failed to connect to Postgres.");
 
     // Here we choose to bind explicitly to localhost, 127.0.0.1, for security
     // reasons. This binding may cause issues in some environments. For example,
diff --git a/chapter04/Cargo.toml b/chapter04/Cargo.toml
index ab9a5af..4beefe0 100644
--- a/chapter04/Cargo.toml
+++ b/chapter04/Cargo.toml
@@ -19,7 +19,6 @@ tokio = "0.2.22"
 serde = "1.0.115"
 config = { version = "0.10.1", default-features = false, features = ["yaml"] }
 sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runtime-tokio", "macros", "postgres", "uuid", "chrono", "migrate"] }
-anyhow = "1.0.32"
 uuid = { version = "0.8.1", features = ["v4"] }
 chrono = "0.4.15"
 tracing = "0.1.19"
diff --git a/chapter04/src/main.rs b/chapter04/src/main.rs
index a7a516b..6d032d2 100644
--- a/chapter04/src/main.rs
+++ b/chapter04/src/main.rs
@@ -1,4 +1,3 @@
-use anyhow::Context;
 use chapter04::configuration::get_configuration;
 use chapter04::startup::run;
 use chapter04::telemetry::{get_subscriber, init_subscriber};
@@ -6,15 +5,14 @@ use sqlx::postgres::PgPool;
 use std::net::TcpListener;
 
 #[actix_rt::main]
-async fn main() -> Result<(), anyhow::Error> {
+async fn main() -> std::io::Result<()> {
     let subscriber = get_subscriber("zero2prod".into(), "info".into());
     init_subscriber(subscriber);
 
     let configuration = get_configuration().expect("Failed to read configuration.");
     let connection_pool = PgPool::connect(&configuration.database.connection_string())
         .await
-        .map_err(anyhow::Error::from)
-        .with_context(|| "Failed to connect to Postgres.")?;
+        .expect("Failed to connect to Postgres.");
 
     // Here we choose to bind explicitly to localhost, 127.0.0.1, for security
     // reasons. This binding may cause issues in some environments. For example,