diff --git a/FFMpegCore.Test/Resources/VideoLibrary.cs b/FFMpegCore.Test/Resources/VideoLibrary.cs
index 26ad6aa..90e809d 100644
--- a/FFMpegCore.Test/Resources/VideoLibrary.cs
+++ b/FFMpegCore.Test/Resources/VideoLibrary.cs
@@ -43,7 +43,7 @@ public static string OutputLocation(this FileInfo file, ImageType type)
         public static string OutputLocation(this FileInfo file, Enum type, string keyword)
         {
             string originalLocation = file.Directory.FullName,
-                outputFile = file.Name.Replace(file.Extension, keyword + "." + type.ToString().ToLower());
+                outputFile = file.Name.Replace(file.Extension, keyword + "." + type.ToString().ToLowerInvariant());
 
             return $"{originalLocation}{Path.DirectorySeparatorChar}{outputFile}";
         }
diff --git a/FFMpegCore/FFMpeg/Arguments/AudioCodecArgument.cs b/FFMpegCore/FFMpeg/Arguments/AudioCodecArgument.cs
index 3b81ddd..76fac85 100644
--- a/FFMpegCore/FFMpeg/Arguments/AudioCodecArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/AudioCodecArgument.cs
@@ -13,6 +13,6 @@ public AudioCodecArgument(AudioCodec audioCodec)
             AudioCodec = audioCodec;
         }
 
-        public string Text => $"-c:a {AudioCodec.ToString().ToLower()}";
+        public string Text => $"-c:a {AudioCodec.ToString().ToLowerInvariant()}";
     }
 }
diff --git a/FFMpegCore/FFMpeg/Arguments/BitStreamFilterArgument.cs b/FFMpegCore/FFMpeg/Arguments/BitStreamFilterArgument.cs
index 871df5e..e5a4b35 100644
--- a/FFMpegCore/FFMpeg/Arguments/BitStreamFilterArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/BitStreamFilterArgument.cs
@@ -18,8 +18,8 @@ public BitStreamFilterArgument(Channel channel, Filter filter)
 
         public string Text => Channel switch
         {
-            Channel.Audio => $"-bsf:a {Filter.ToString().ToLower()}",
-            Channel.Video => $"-bsf:v {Filter.ToString().ToLower()}",
+            Channel.Audio => $"-bsf:a {Filter.ToString().ToLowerInvariant()}",
+            Channel.Video => $"-bsf:v {Filter.ToString().ToLowerInvariant()}",
             _ => string.Empty
         };
     }
diff --git a/FFMpegCore/FFMpeg/Arguments/ForceFormatArgument.cs b/FFMpegCore/FFMpeg/Arguments/ForceFormatArgument.cs
index 503c6ec..3367f99 100644
--- a/FFMpegCore/FFMpeg/Arguments/ForceFormatArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/ForceFormatArgument.cs
@@ -13,7 +13,7 @@ public ForceFormatArgument(string format)
             _format = format;
         }
 
-        public ForceFormatArgument(VideoCodec value) : this(value.ToString().ToLower()) { }
+        public ForceFormatArgument(VideoCodec value) : this(value.ToString().ToLowerInvariant()) { }
 
         public string Text => $"-f {_format}";
     }
diff --git a/FFMpegCore/FFMpeg/Arguments/SpeedPresetArgument.cs b/FFMpegCore/FFMpeg/Arguments/SpeedPresetArgument.cs
index 401e2dd..6046c3c 100644
--- a/FFMpegCore/FFMpeg/Arguments/SpeedPresetArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/SpeedPresetArgument.cs
@@ -14,6 +14,6 @@ public SpeedPresetArgument(Speed speed)
             Speed = speed;
         }
 
-        public string Text => $"-preset {Speed.ToString().ToLower()}";
+        public string Text => $"-preset {Speed.ToString().ToLowerInvariant()}";
     }
 }
diff --git a/FFMpegCore/FFMpeg/Arguments/VideoCodecArgument.cs b/FFMpegCore/FFMpeg/Arguments/VideoCodecArgument.cs
index 4e2b782..7c47592 100644
--- a/FFMpegCore/FFMpeg/Arguments/VideoCodecArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/VideoCodecArgument.cs
@@ -14,7 +14,7 @@ public VideoCodecArgument(string codec)
             Codec = codec;
         }
 
-        public VideoCodecArgument(VideoCodec value) : this(value.ToString().ToLower()) { }
+        public VideoCodecArgument(VideoCodec value) : this(value.ToString().ToLowerInvariant()) { }
 
         public string Text => $"-c:v {Codec} -pix_fmt yuv420p";
     }
diff --git a/FFMpegCore/ImageInfo.cs b/FFMpegCore/ImageInfo.cs
index f4b9aa4..cf8561e 100644
--- a/FFMpegCore/ImageInfo.cs
+++ b/FFMpegCore/ImageInfo.cs
@@ -16,7 +16,7 @@ public class ImageInfo
         /// <param name="fileInfo">Image file information.</param>
         public ImageInfo(FileInfo fileInfo)
         {
-            if (!fileInfo.Extension.ToLower().EndsWith(FileExtension.Png))
+            if (!fileInfo.Extension.ToLowerInvariant().EndsWith(FileExtension.Png))
             {
                 throw new Exception("Image joining currently suppors only .png file types");
             }