diff --git a/Cargo.toml b/Cargo.toml
index 3e54a456..93f39c7c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -150,5 +150,9 @@ notify = "6.0"
 temp-env = "0.3"
 log = { version = "0.4", features = ["serde"] }
 
+[[example]]
+name = "async_source"
+required-features = ["json", "async"]
+
 [lints]
 workspace = true
diff --git a/examples/custom_file_format/main.rs b/examples/custom_file_format/main.rs
index e22901cf..2fd47b80 100644
--- a/examples/custom_file_format/main.rs
+++ b/examples/custom_file_format/main.rs
@@ -2,7 +2,7 @@ use config::{Config, File, FileStoredFormat, Format, Map, Value, ValueKind};
 use std::io::{Error, ErrorKind};
 
 /// The private and public key sources will be read into their associated variable:
-#[derive(serde::Deserialize, Clone, Debug)]
+#[derive(serde_derive::Deserialize, Clone, Debug)]
 pub struct Settings {
     pub private_key: Option<String>,
     pub public_key: Option<String>,
diff --git a/src/builder.rs b/src/builder.rs
index f511d255..465f3ae9 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -38,6 +38,8 @@ use crate::{config::Config, path::Expression, source::Source, value::Value};
 /// # use config::*;
 /// # use std::error::Error;
 /// # fn main() -> Result<(), Box<dyn Error>> {
+/// # #[cfg(feature = "json")]
+/// # {
 /// let mut builder = Config::builder()
 ///     .set_default("default", "1")?
 ///     .add_source(File::new("config/settings", FileFormat::Json))
@@ -52,6 +54,7 @@ use crate::{config::Config, path::Expression, source::Source, value::Value};
 ///         // something went wrong
 ///     }
 /// }
+/// # }
 /// # Ok(())
 /// # }
 /// ```
@@ -64,11 +67,14 @@ use crate::{config::Config, path::Expression, source::Source, value::Value};
 /// # use std::error::Error;
 /// # use config::*;
 /// # fn main() -> Result<(), Box<dyn Error>> {
+/// # #[cfg(feature = "json")]
+/// # {
 /// let mut builder = Config::builder();
 /// builder = builder.set_default("default", "1")?;
 /// builder = builder.add_source(File::new("config/settings", FileFormat::Json));
 /// builder = builder.add_source(File::new("config/settings.prod", FileFormat::Json));
 /// builder = builder.set_override("override", "1")?;
+/// # }
 /// # Ok(())
 /// # }
 /// ```
diff --git a/src/ser.rs b/src/ser.rs
index 4d8f9778..bb5af9e3 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -679,6 +679,8 @@ impl ser::SerializeStructVariant for Unreachable {
 mod test {
     use super::*;
     use serde::{Deserialize, Serialize};
+    #[cfg(not(feature = "json5"))]
+    use serde_derive::{Deserialize, Serialize};
 
     #[test]
     fn test_struct() {
@@ -699,6 +701,7 @@ mod test {
     }
 
     #[test]
+    #[cfg(feature = "json")]
     fn test_nest() {
         let val = serde_json::json! { {
             "top": {
diff --git a/src/value.rs b/src/value.rs
index 55f21d6c..c242c628 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -888,6 +888,7 @@ mod tests {
     use crate::FileFormat;
 
     #[test]
+    #[cfg(feature = "toml")]
     fn test_i64() {
         let c = Config::builder()
             .add_source(File::new("tests/types/i64.toml", FileFormat::Toml))
diff --git a/tests/async_builder.rs b/tests/async_builder.rs
index 81c53bce..985b0ec7 100644
--- a/tests/async_builder.rs
+++ b/tests/async_builder.rs
@@ -1,3 +1,7 @@
+#![cfg(feature = "async")]
+#![cfg(feature = "json")]
+#![cfg(feature = "toml")]
+
 use async_trait::async_trait;
 use config::{AsyncSource, Config, ConfigError, FileFormat, Format, Map, Value};
 use std::{env, fs, path, str::FromStr};
diff --git a/tests/env.rs b/tests/env.rs
index 30aaedb2..4befa5bb 100644
--- a/tests/env.rs
+++ b/tests/env.rs
@@ -522,6 +522,7 @@ fn test_parse_string_and_list_ignore_list_parse_key_case() {
 }
 
 #[test]
+#[cfg(feature = "convert-case")]
 fn test_parse_nested_kebab() {
     use config::Case;
 
diff --git a/tests/file.rs b/tests/file.rs
index e14c8265..f9fb07f0 100644
--- a/tests/file.rs
+++ b/tests/file.rs
@@ -25,6 +25,7 @@ fn test_file_required_not_found() {
 }
 
 #[test]
+#[cfg(feature = "toml")]
 fn test_file_auto() {
     let c = Config::builder()
         .add_source(File::with_name("tests/Settings-production"))
@@ -49,6 +50,7 @@ fn test_file_auto_not_found() {
 }
 
 #[test]
+#[cfg(feature = "json")]
 fn test_file_ext() {
     let c = Config::builder()
         .add_source(File::with_name("tests/Settings.json"))
@@ -58,7 +60,9 @@ fn test_file_ext() {
     assert_eq!(c.get("debug").ok(), Some(true));
     assert_eq!(c.get("production").ok(), Some(false));
 }
+
 #[test]
+#[cfg(feature = "ini")]
 fn test_file_second_ext() {
     let c = Config::builder()
         .add_source(File::with_name("tests/Settings2.default"))
diff --git a/tests/integer_range.rs b/tests/integer_range.rs
index e80a2f2f..42292ea0 100644
--- a/tests/integer_range.rs
+++ b/tests/integer_range.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "toml")]
+
 use config::Config;
 
 #[test]
diff --git a/tests/legacy/file.rs b/tests/legacy/file.rs
index 11cedee1..a4ef41c7 100644
--- a/tests/legacy/file.rs
+++ b/tests/legacy/file.rs
@@ -23,6 +23,7 @@ fn test_file_required_not_found() {
 }
 
 #[test]
+#[cfg(feature = "toml")]
 fn test_file_auto() {
     let mut c = Config::default();
     c.merge(File::with_name("tests/Settings-production"))
@@ -45,6 +46,7 @@ fn test_file_auto_not_found() {
 }
 
 #[test]
+#[cfg(feature = "json")]
 fn test_file_ext() {
     let mut c = Config::default();
     c.merge(File::with_name("tests/Settings.json")).unwrap();
diff --git a/tests/log.rs b/tests/log.rs
index 4bb267f3..082c90f4 100644
--- a/tests/log.rs
+++ b/tests/log.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "json")]
+
 #[macro_use]
 extern crate serde_derive;
 
@@ -33,6 +35,7 @@ fn test_case_sensitivity_log_level_from_str() {
 }
 
 #[test]
+#[cfg(feature = "json")]
 fn test_case_sensitivity_json_from_str() {
     // to confirm serde_json works as expected
     let s = r#"{ "log": "error" }"#;
diff --git a/tests/ron_enum.rs b/tests/ron_enum.rs
index ee0264cf..fa0d96da 100644
--- a/tests/ron_enum.rs
+++ b/tests/ron_enum.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "ron")]
+
 use config::{Config, File, FileFormat};
 use serde_derive::Deserialize;
 
diff --git a/tests/unsigned_int.rs b/tests/unsigned_int.rs
index 8656a012..0022314a 100644
--- a/tests/unsigned_int.rs
+++ b/tests/unsigned_int.rs
@@ -1,11 +1,11 @@
 #![cfg(feature = "preserve_order")]
 
-#[derive(serde::Deserialize, Eq, PartialEq, Debug)]
+#[derive(serde_derive::Deserialize, Eq, PartialEq, Debug)]
 struct Container<T> {
     inner: T,
 }
 
-#[derive(serde::Deserialize, Eq, PartialEq, Debug)]
+#[derive(serde_derive::Deserialize, Eq, PartialEq, Debug)]
 struct Unsigned {
     unsigned: u16,
 }
diff --git a/tests/unsigned_int_hm.rs b/tests/unsigned_int_hm.rs
index ab2a60cc..87d9a99a 100644
--- a/tests/unsigned_int_hm.rs
+++ b/tests/unsigned_int_hm.rs
@@ -1,11 +1,11 @@
 #![cfg(not(feature = "preserve_order"))]
 
-#[derive(serde::Deserialize, Eq, PartialEq, Debug)]
+#[derive(serde_derive::Deserialize, Eq, PartialEq, Debug)]
 struct Container<T> {
     inner: T,
 }
 
-#[derive(serde::Deserialize, Eq, PartialEq, Debug)]
+#[derive(serde_derive::Deserialize, Eq, PartialEq, Debug)]
 struct Unsigned {
     unsigned: u16,
 }
diff --git a/tests/weird_keys.rs b/tests/weird_keys.rs
index c997fe05..ef1749d1 100644
--- a/tests/weird_keys.rs
+++ b/tests/weird_keys.rs
@@ -4,6 +4,9 @@
 // Please don't be offended!
 //
 
+#![cfg(feature = "json")]
+#![cfg(feature = "toml")]
+
 use serde_derive::{Deserialize, Serialize};
 
 use config::{File, FileFormat};