diff --git a/build.gradle.kts b/build.gradle.kts
index 79b211e..f160108 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -11,4 +11,4 @@ subprojects {
 }
 
 group = "io.github.seggan"
-version = "0.3-SNAPSHOT"
\ No newline at end of file
+version = "0.4-SNAPSHOT"
\ No newline at end of file
diff --git a/docs/index.papyri b/docs/index.papyri
index ffa4032..b67df70 100644
--- a/docs/index.papyri
+++ b/docs/index.papyri
@@ -42,6 +42,11 @@ This will create a JAR file in `metis-app/build/libs` that can be run with `java
 
 @h2 Changelog
 
+@h3 { 0.4.0 }
+[
+    {Removed the `__len__` metamethod (and the `len` function) and replaced it with the `size` function},
+]
+
 @h2 { 0.3.0 }
 [
     {Fixed upvalues having the wrong value when the function is passed as an argument},