diff --git a/.gitignore b/.gitignore
index b7aa456..9b68b8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -348,3 +348,4 @@ healthchecksdb
 # Backup folder for Package Reference Convert tool in Visual Studio 2017
 MigrationBackup/
 .vscode
+src/.idea
diff --git a/src/WebPWrapper/Decoder/WebPDecoderBuilder.cs b/src/WebPWrapper/Decoder/WebPDecoderBuilder.cs
index e64254a..f9bf53c 100644
--- a/src/WebPWrapper/Decoder/WebPDecoderBuilder.cs
+++ b/src/WebPWrapper/Decoder/WebPDecoderBuilder.cs
@@ -17,10 +17,10 @@ public class WebPDecoderBuilder : IWebPDecoderBuilder {
         private string _executeFilePath;
 
         // Default CLI path. (If Cli downloaded by WebPExecuteDownloader.
-        public const string _windowsDir = "libwebp-1.3.2-windows-x64";
-        public const string _linuxDir = "libwebp-1.3.2-linux-x86-64";
-        public const string _osxDir = "libwebp-1.3.2-mac-x86-64";
-        public const string _osxARMDir = "libwebp-1.3.2-mac-arm64";
+        public const string _windowsDir = "libwebp-1.4.0-windows-x64";
+        public const string _linuxDir = "libwebp-1.4.0-linux-x86-64";
+        public const string _osxDir = "libwebp-1.4.0-mac-x86-64";
+        public const string _osxARMDir = "libwebp-1.4.0-mac-arm64";
 
         /// <summary>
         /// Create <see cref="WebPDecoderBuilder"/>
diff --git a/src/WebPWrapper/Encoder/WebPEncoderBuilder.cs b/src/WebPWrapper/Encoder/WebPEncoderBuilder.cs
index 093909d..8c8e1a2 100644
--- a/src/WebPWrapper/Encoder/WebPEncoderBuilder.cs
+++ b/src/WebPWrapper/Encoder/WebPEncoderBuilder.cs
@@ -17,10 +17,10 @@ public class WebPEncoderBuilder : IWebPEncoderBuilder {
         private string _executeFilePath;
 
 
-        public const string _windowsDir = "libwebp-1.3.2-windows-x64";
-        public const string _linuxDir = "libwebp-1.3.2-linux-x86-64";
-        public const string _osxDir = "libwebp-1.3.2-mac-x86-64";
-        public const string _osxARMDir = "libwebp-1.3.2-mac-arm64";
+        public const string _windowsDir = "libwebp-1.4.0-windows-x64";
+        public const string _linuxDir = "libwebp-1.4.0-linux-x86-64";
+        public const string _osxDir = "libwebp-1.4.0-mac-x86-64";
+        public const string _osxARMDir = "libwebp-1.4.0-mac-arm64";
         /// <summary>
         /// Create <see cref="WebPEncoderBuilder"/>
         /// </summary>
diff --git a/src/WebPWrapper/WebPExecuteDownloader.cs b/src/WebPWrapper/WebPExecuteDownloader.cs
index d4171b6..05fd977 100644
--- a/src/WebPWrapper/WebPExecuteDownloader.cs
+++ b/src/WebPWrapper/WebPExecuteDownloader.cs
@@ -16,16 +16,16 @@ namespace WebPWrapper
     public static class WebPExecuteDownloader
     {
         public const string WELL_KNOWN_WINDOWS_CLI_URL =
-            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.3.2-windows-x64.zip";
+            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.4.0-windows-x64.zip";
 
         public const string WELL_KNOWN_LINUX_CLI_URL =
-            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.3.2-linux-x86-64.tar.gz";
+            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.4.0-linux-x86-64.tar.gz";
 
         public const string WELL_KNOWN_OSX_CLI_URL =
-            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.3.2-mac-x86-64.tar.gz";
+            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.4.0-mac-x86-64.tar.gz";
 
         public const string WELL_KNOWN_OSX_ARM_CLI_URL =
-            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.3.2-mac-arm64.tar.gz";
+            "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.4.0-mac-arm64.tar.gz";
 
         /// <summary>
         /// Download CLI binary file.