diff --git a/src/UglyToad.PdfPig.Tests/Integration/MultiplePageMortalityStatisticsTests.cs b/src/UglyToad.PdfPig.Tests/Integration/MultiplePageMortalityStatisticsTests.cs
index 901a6d95..addc0709 100644
--- a/src/UglyToad.PdfPig.Tests/Integration/MultiplePageMortalityStatisticsTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Integration/MultiplePageMortalityStatisticsTests.cs
@@ -30,7 +30,7 @@
         {
             using (var document = PdfDocument.Open(GetFilename()))
             {
-                Assert.Equal(1.7m, document.Version);
+                Assert.Equal(1.7, document.Version);
             }
         }
 
diff --git a/src/UglyToad.PdfPig.Tests/Integration/SwedishTouringCarChampionshipTests.cs b/src/UglyToad.PdfPig.Tests/Integration/SwedishTouringCarChampionshipTests.cs
index 29b98354..ed842a81 100644
--- a/src/UglyToad.PdfPig.Tests/Integration/SwedishTouringCarChampionshipTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Integration/SwedishTouringCarChampionshipTests.cs
@@ -25,7 +25,7 @@
         {
             using (var document = PdfDocument.Open(GetFilename()))
             {
-                Assert.Equal(1.4m, document.Version);
+                Assert.Equal(1.4, document.Version);
             }
         }
 
diff --git a/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs b/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
index 33fc5187..22418c4b 100644
--- a/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
@@ -50,7 +50,7 @@
 
             var result = FileHeaderParser.Parse(scanner.scanner, scanner.bytes, false, log);
 
-            Assert.Equal(1.2m, result.Version);
+            Assert.Equal(1.2, result.Version);
             Assert.Equal(TestEnvironment.IsSingleByteNewLine(input) ? 7 : 9, result.OffsetInFile);
         }
 
@@ -73,7 +73,7 @@
 
             var result = FileHeaderParser.Parse(scanner.scanner, scanner.bytes, false, log);
 
-            Assert.Equal(1.2m, result.Version);
+            Assert.Equal(1.2, result.Version);
             Assert.Equal(TestEnvironment.IsSingleByteNewLine(input) ? 12 : 13, result.OffsetInFile);
         }
 
@@ -86,7 +86,7 @@
 
             var result = FileHeaderParser.Parse(scanner.scanner, scanner.bytes, true, log);
 
-            Assert.Equal(1.7m, result.Version);
+            Assert.Equal(1.7, result.Version);
             Assert.Equal(TestEnvironment.IsSingleByteNewLine(input) ? 12 : 13, result.OffsetInFile);
         }
 
@@ -100,7 +100,7 @@ three %PDF-1.6";
 
             var result = FileHeaderParser.Parse(scanner.scanner, scanner.bytes, true, log);
 
-            Assert.Equal(1.6m, result.Version);
+            Assert.Equal(1.6, result.Version);
             Assert.Equal(TestEnvironment.IsSingleByteNewLine(s) ? 14 : 15, result.OffsetInFile);
         }
 
@@ -131,7 +131,7 @@ three %PDF-1.6";
 
             var result = FileHeaderParser.Parse(scanner.scanner, scanner.bytes, true, log);
 
-            Assert.Equal(1.4m, result.Version);
+            Assert.Equal(1.4, result.Version);
         }
 
         [Fact]
@@ -156,7 +156,7 @@ three %PDF-1.6";
 
             var result = FileHeaderParser.Parse(scanner, bytes, false, log);
 
-            Assert.Equal(1.7m, result.Version);
+            Assert.Equal(1.7, result.Version);
         }
 
         [Fact]
@@ -175,7 +175,7 @@ three %PDF-1.6";
 
             Assert.Equal(0, scanner.scanner.CurrentPosition);
             Assert.Equal(128, result.OffsetInFile);
-            Assert.Equal(1.1m, result.Version);
+            Assert.Equal(1.1, result.Version);
             Assert.Equal("PDF-1.1", result.VersionString);
         }
     }
diff --git a/src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs b/src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs
index 62901ade..ad6d34f9 100644
--- a/src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs
@@ -56,7 +56,7 @@
                 Assert.Equal(2, document.NumberOfPages);
                 if (checkVersion)
                 {
-                    Assert.Equal(1.5m, document.Version);
+                    Assert.Equal(1.5, document.Version);
                 }
 
                 var page1 = document.GetPage(1);
diff --git a/src/UglyToad.PdfPig/Content/HeaderVersion.cs b/src/UglyToad.PdfPig/Content/HeaderVersion.cs
index fc09b4e0..fd61a898 100644
--- a/src/UglyToad.PdfPig/Content/HeaderVersion.cs
+++ b/src/UglyToad.PdfPig/Content/HeaderVersion.cs
@@ -4,7 +4,7 @@
 
     internal class HeaderVersion
     {
-        public decimal Version { get; }
+        public double Version { get; }
 
         public string VersionString { get; }
 
@@ -13,7 +13,7 @@
         /// </summary>
         public long OffsetInFile { get; }
 
-        public HeaderVersion(decimal version, string versionString, long offsetInFile)
+        public HeaderVersion(double version, string versionString, long offsetInFile)
         {
             Version = version;
             VersionString = versionString;
diff --git a/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderParser.cs b/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderParser.cs
index b2e979b9..050dd103 100644
--- a/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderParser.cs
+++ b/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderParser.cs
@@ -69,9 +69,9 @@
                 return HandleMissingVersion(comment, isLenientParsing, log);
             }
 
-            const int toDecimalStartLength = 4;
+            const int toDoubleStartLength = 4;
 
-            if (!decimal.TryParse(comment.Data.Substring(toDecimalStartLength),
+            if (!double.TryParse(comment.Data.Substring(toDoubleStartLength),
                 NumberStyles.Number,
                 CultureInfo.InvariantCulture,
                 out var version))
@@ -120,7 +120,7 @@
                 if (actualIndex >= 0 && content.Length - actualIndex >= versionLength)
                 {
                     var numberPart = content.Substring(actualIndex + 5, 3);
-                    if (decimal.TryParse(
+                    if (double.TryParse(
                             numberPart,
                             NumberStyles.Number,
                             CultureInfo.InvariantCulture,
@@ -152,7 +152,7 @@
             {
                 log.Warn($"Did not find a version header of the correct format, defaulting to 1.4 since lenient. Header was: {comment.Data}.");
 
-                return new HeaderVersion(1.4m, "PDF-1.4", 0);
+                return new HeaderVersion(1.4, "PDF-1.4", 0);
             }
 
             throw new PdfDocumentFormatException($"The comment which should have provided the version was in the wrong format: {comment.Data}.");
diff --git a/src/UglyToad.PdfPig/PdfDocument.cs b/src/UglyToad.PdfPig/PdfDocument.cs
index 65826986..19ca1247 100644
--- a/src/UglyToad.PdfPig/PdfDocument.cs
+++ b/src/UglyToad.PdfPig/PdfDocument.cs
@@ -52,7 +52,7 @@
         public DocumentInformation Information { get; }
 
         /// <summary>
-        /// Access to the underlying raw structure of the document. 
+        /// Access to the underlying raw structure of the document.
         /// </summary>
         [NotNull]
         public Structure Structure { get; }
@@ -65,7 +65,7 @@
         /// <summary>
         /// The version number of the PDF specification which this file conforms to, for example 1.4.
         /// </summary>
-        public decimal Version => version.Version;
+        public double Version => version.Version;
 
         /// <summary>
         /// Get the number of pages in this document.
diff --git a/src/UglyToad.PdfPig/Writer/IPdfStreamWriter.cs b/src/UglyToad.PdfPig/Writer/IPdfStreamWriter.cs
index cac1b1de..98d5941d 100644
--- a/src/UglyToad.PdfPig/Writer/IPdfStreamWriter.cs
+++ b/src/UglyToad.PdfPig/Writer/IPdfStreamWriter.cs
@@ -50,7 +50,7 @@
         /// Initializes the PDF stream with pdf header.
         /// </summary>
         /// <param name="version">Version of PDF.</param>
-        void InitializePdf(decimal version);
+        void InitializePdf(double version);
 
         /// <summary>
         /// Completes the PDF writing trailing PDF information.
diff --git a/src/UglyToad.PdfPig/Writer/PdfABaselineRuleBuilder.cs b/src/UglyToad.PdfPig/Writer/PdfABaselineRuleBuilder.cs
index 4ca39d35..aa9014f1 100644
--- a/src/UglyToad.PdfPig/Writer/PdfABaselineRuleBuilder.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfABaselineRuleBuilder.cs
@@ -14,7 +14,7 @@ namespace UglyToad.PdfPig.Writer
             Func<IToken, IndirectReferenceToken> writerFunc,
             PdfDocumentBuilder.DocumentInformationBuilder documentInformationBuilder,
             PdfAStandard archiveStandard,
-            decimal version,
+            double version,
             XDocument xmpMetadata)
         {
             catalog[NameToken.OutputIntents] = OutputIntentsFactory.GetOutputIntentsArray(writerFunc);
diff --git a/src/UglyToad.PdfPig/Writer/PdfDedupStreamWriter.cs b/src/UglyToad.PdfPig/Writer/PdfDedupStreamWriter.cs
index 72ad6525..17f29c56 100644
--- a/src/UglyToad.PdfPig/Writer/PdfDedupStreamWriter.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfDedupStreamWriter.cs
@@ -13,7 +13,7 @@
             Stream stream,
             bool dispose,
             ITokenWriter tokenWriter = null,
-            Action<decimal> recordVersion = null
+            Action<double> recordVersion = null
             ) : base(stream, dispose, tokenWriter, recordVersion)
         {
         }
diff --git a/src/UglyToad.PdfPig/Writer/PdfDocumentBuilder.cs b/src/UglyToad.PdfPig/Writer/PdfDocumentBuilder.cs
index 7e203f3f..2bc6f960 100644
--- a/src/UglyToad.PdfPig/Writer/PdfDocumentBuilder.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfDocumentBuilder.cs
@@ -31,7 +31,7 @@ namespace UglyToad.PdfPig.Writer
         private readonly Dictionary<Guid, FontStored> fonts = new Dictionary<Guid, FontStored>();
         private bool completed = false;
         private int fontId = 0;
-        private decimal version = 1.7m;
+        private double version = 1.7;
 
         private readonly static ArrayToken DefaultProcSet = new ArrayToken(new List<NameToken>
         {
@@ -85,14 +85,14 @@ namespace UglyToad.PdfPig.Writer
         public PdfDocumentBuilder()
         {
             context = new PdfStreamWriter(new MemoryStream(), true, recordVersion: x => version = x);
-            context.InitializePdf(1.7m);
+            context.InitializePdf(1.7);
         }
 
         /// <summary>
         /// Creates a document builder keeping resources in memory.
         /// </summary>
         /// <param name="version">Pdf version to use in header.</param>
-        public PdfDocumentBuilder(decimal version)
+        public PdfDocumentBuilder(double version)
         {
             context = new PdfStreamWriter(new MemoryStream(), true, recordVersion: x => version = x);
             context.InitializePdf(version);
@@ -106,7 +106,7 @@ namespace UglyToad.PdfPig.Writer
         /// <param name="type">Type of pdf stream writer to use</param>
         /// <param name="version">Pdf version to use in header.</param>
         /// <param name="tokenWriter">Token writer to use</param>
-        public PdfDocumentBuilder(Stream stream, bool disposeStream = false, PdfWriterType type = PdfWriterType.Default, decimal version = 1.7m, ITokenWriter tokenWriter = null)
+        public PdfDocumentBuilder(Stream stream, bool disposeStream = false, PdfWriterType type = PdfWriterType.Default, double version = 1.7, ITokenWriter tokenWriter = null)
         {
             switch (type)
             {
diff --git a/src/UglyToad.PdfPig/Writer/PdfMerger.cs b/src/UglyToad.PdfPig/Writer/PdfMerger.cs
index 318a4583..33e24423 100644
--- a/src/UglyToad.PdfPig/Writer/PdfMerger.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfMerger.cs
@@ -135,7 +135,7 @@
 
         private static void Merge(IReadOnlyList<PdfDocument> files, Stream output, IReadOnlyList<IReadOnlyList<int>> pagesBundle, PdfAStandard archiveStandard = PdfAStandard.None, PdfDocumentBuilder.DocumentInformationBuilder docInfoBuilder = null)
         {
-            var maxVersion = files.Select(x=>x.Version).Max();
+            var maxVersion = files.Select(x => x.Version).Max();
             using (var document = new PdfDocumentBuilder(output, false, PdfWriterType.Default, maxVersion))
             {
                 document.ArchiveStandard = archiveStandard;
diff --git a/src/UglyToad.PdfPig/Writer/PdfStreamWriter.cs b/src/UglyToad.PdfPig/Writer/PdfStreamWriter.cs
index 34058c58..eb5e3c58 100644
--- a/src/UglyToad.PdfPig/Writer/PdfStreamWriter.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfStreamWriter.cs
@@ -13,8 +13,8 @@
     /// </summary>
     internal class PdfStreamWriter : IPdfStreamWriter
     {
-        private readonly Action<decimal> recordVersion;
-        protected const decimal DefaultVersion = 1.2m;
+        private readonly Action<double> recordVersion;
+        protected const double DefaultVersion = 1.2;
         protected Dictionary<IndirectReference, long> offsets = new Dictionary<IndirectReference, long>();
         protected bool DisposeStream { get; set; }
         protected bool Initialized { get; set; }
@@ -35,7 +35,7 @@
             Stream baseStream,
             bool disposeStream = true,
             ITokenWriter tokenWriter = null,
-            Action<decimal> recordVersion = null)
+            Action<double> recordVersion = null)
         {
             Stream = baseStream ?? throw new ArgumentNullException(nameof(baseStream));
 
@@ -81,7 +81,7 @@
             return new IndirectReferenceToken(new IndirectReference(CurrentNumber++, 0));
         }
 
-        public void InitializePdf(decimal version)
+        public void InitializePdf(double version)
         {
             recordVersion?.Invoke(version);
 
diff --git a/src/UglyToad.PdfPig/Writer/Xmp/XmpWriter.cs b/src/UglyToad.PdfPig/Writer/Xmp/XmpWriter.cs
index f56d0717..fc583560 100644
--- a/src/UglyToad.PdfPig/Writer/Xmp/XmpWriter.cs
+++ b/src/UglyToad.PdfPig/Writer/Xmp/XmpWriter.cs
@@ -38,7 +38,7 @@ namespace UglyToad.PdfPig.Writer.Xmp
         private const string PdfAIdentificationExtensionPrefix = "pdfaid";
         private const string PdfAIdentificationExtensionNamespace = "http://www.aiim.org/pdfa/ns/id/";
         
-        public static StreamToken GenerateXmpStream(PdfDocumentBuilder.DocumentInformationBuilder builder, decimal version,
+        public static StreamToken GenerateXmpStream(PdfDocumentBuilder.DocumentInformationBuilder builder, double version,
             PdfAStandard standard, XDocument additionalXmpMetadata)
         {
             XNamespace xmpMeta = XmpMetaNamespace;