diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f800831e..2b28c6d68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## v4.0.0
+## v4.0.0 (2022-10-12)
 
 - Improved API error parsing
   - API error message may be an array rather than a string. Arrays will be concatenated (by comma) and returned as a string.
diff --git a/EasyPost.nuspec b/EasyPost.nuspec
index 43959cd38..f2ea250d8 100644
--- a/EasyPost.nuspec
+++ b/EasyPost.nuspec
@@ -3,7 +3,7 @@
     <metadata>
         <id>EasyPost-Official</id>
         <title>EasyPost (Official)</title>
-        <version>4.0.0-rc1</version>
+        <version>4.0.0</version>
         <authors>EasyPost</authors>
         <owners>EasyPost</owners>
         <projectUrl>https://www.easypost.com</projectUrl>
diff --git a/EasyPost/Properties/VersionInfo.cs b/EasyPost/Properties/VersionInfo.cs
index 4ef849af0..03dd66c48 100644
--- a/EasyPost/Properties/VersionInfo.cs
+++ b/EasyPost/Properties/VersionInfo.cs
@@ -1,6 +1,7 @@
 using System.Reflection;
 
 // Version information for an assembly must follow semantic versioning
-[assembly: AssemblyVersion("4.0.0.1")]
-[assembly: AssemblyFileVersion("4.0.0.1")]
-[assembly: AssemblyInformationalVersion("4.0.0.1")]
+// When releasing a release candidate, append a 4th digit being the number of the release candidate
+[assembly: AssemblyVersion("4.0.0")]
+[assembly: AssemblyFileVersion("4.0.0")]
+[assembly: AssemblyInformationalVersion("4.0.0")]