diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51b4dae..2df3064 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,10 +19,10 @@ jobs:
       - name: Install rust
         uses: hecrj/setup-rust-action@v1
         with:
-          rust-version: 1.64.0
+          rust-version: 1.75.0
       
       - name: Build
-        run: cargo build -v --release
+        run: cargo build --verbose --release
       
       - name: Test
-        run: cargo test -v --release
+        run: cargo test --verbose --release --features async
diff --git a/README.md b/README.md
index 8771c42..e69298c 100644
--- a/README.md
+++ b/README.md
@@ -62,8 +62,8 @@ tinify-rs = { version = "1.3.0", features = ["async"] }
 
 - Compress from a file
 ```rust
-use tinify::Tinify;
-use tinify::TinifyError;
+use tinify::sync::Tinify;
+use tinify::error::TinifyError;
 
 fn main() -> Result<(), TinifyError> {
   let key = "tinify api key";
diff --git a/src/sync/client.rs b/src/sync/client.rs
index 81795ba..b369613 100644
--- a/src/sync/client.rs
+++ b/src/sync/client.rs
@@ -49,8 +49,8 @@ impl Client {
   /// # Examples
   ///
   /// ```
-  /// use tinify::Tinify;
-  /// use tinify::TinifyError;
+  /// use tinify::sync::Tinify;
+  /// use tinify::error::TinifyError;
   /// use std::fs;
   ///
   /// fn main() -> Result<(), TinifyError> {
diff --git a/src/sync/source.rs b/src/sync/source.rs
index 3a3c91f..6d4efe7 100644
--- a/src/sync/source.rs
+++ b/src/sync/source.rs
@@ -188,10 +188,10 @@ impl Source {
   /// # Examples
   ///
   /// ```
-  /// use tinify::Tinify;
+  /// use tinify::sync::Tinify;
+  /// use tinify::error::TinifyError;
   /// use tinify::convert::Color;
   /// use tinify::convert::Type;
-  /// use tinify::TinifyError;
   ///
   /// fn main() -> Result<(), TinifyError> {
   ///   let _ = Tinify::new()