diff --git a/.idea/libraries/KotlinJavaRuntime.xml b/.idea/libraries/KotlinJavaRuntime.xml
index fcb9cffe5..21d73669e 100644
--- a/.idea/libraries/KotlinJavaRuntime.xml
+++ b/.idea/libraries/KotlinJavaRuntime.xml
@@ -1,23 +1,23 @@
 <component name="libraryTable">
   <library name="KotlinJavaRuntime" type="repository">
-    <properties maven-id="org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.2.20" />
+    <properties maven-id="org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.2.21" />
     <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.20/kotlin-stdlib-jdk8-2.2.20.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.20/kotlin-stdlib-2.2.20.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.21/kotlin-stdlib-jdk8-2.2.21.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.21/kotlin-stdlib-2.2.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.20/kotlin-stdlib-jdk7-2.2.20.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.21/kotlin-stdlib-jdk7-2.2.21.jar!/" />
     </CLASSES>
     <JAVADOC>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.20/kotlin-stdlib-jdk8-2.2.20-javadoc.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.20/kotlin-stdlib-2.2.20-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.21/kotlin-stdlib-jdk8-2.2.21-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.21/kotlin-stdlib-2.2.21-javadoc.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-javadoc.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.20/kotlin-stdlib-jdk7-2.2.20-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.21/kotlin-stdlib-jdk7-2.2.21-javadoc.jar!/" />
     </JAVADOC>
     <SOURCES>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.20/kotlin-stdlib-jdk8-2.2.20-sources.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.20/kotlin-stdlib-2.2.20-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.21/kotlin-stdlib-jdk8-2.2.21-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.21/kotlin-stdlib-2.2.21-sources.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-sources.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.20/kotlin-stdlib-jdk7-2.2.20-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.21/kotlin-stdlib-jdk7-2.2.21-sources.jar!/" />
     </SOURCES>
   </library>
 </component>
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 28cabb4df..e1fe46ddd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,7 +5,7 @@ import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 
 
 plugins {
-    kotlin("jvm") version "2.2.20"
+    kotlin("jvm") version "2.2.21"
 }
 
 allprojects {
diff --git a/docs/source/libraries.rst b/docs/source/libraries.rst
index 416b04b4f..68682196e 100644
--- a/docs/source/libraries.rst
+++ b/docs/source/libraries.rst
@@ -38,6 +38,17 @@ There's a set of predefined functions in the language. These are fixed and can't
 You can use them in expressions and the compiler will evaluate them at compile-time if possible.
 
 
+Array operations
+^^^^^^^^^^^^^^^^
+
+len (x)
+    Number of values in the array value x, or the number of characters in a string (excluding the 0-byte).
+    Note: this can be different from the number of *bytes* in memory if the datatype isn't a byte. See sizeof().
+    Note: lengths of strings and arrays are determined at compile-time! If your program modifies the actual
+    length of the string during execution, the value of len(s) may no longer be correct!
+    (use the ``strings.length`` routine if you want to dynamically determine the length by counting to the
+    first 0-byte)
+
 Math
 ^^^^
 
@@ -70,18 +81,6 @@ sqrt (x)
     To do the reverse - squaring a number - just write ``x*x``.
 
 
-Array operations
-^^^^^^^^^^^^^^^^
-
-len (x)
-    Number of values in the array value x, or the number of characters in a string (excluding the 0-byte).
-    Note: this can be different from the number of *bytes* in memory if the datatype isn't a byte. See sizeof().
-    Note: lengths of strings and arrays are determined at compile-time! If your program modifies the actual
-    length of the string during execution, the value of len(s) may no longer be correct!
-    (use the ``strings.length`` routine if you want to dynamically determine the length by counting to the
-    first 0-byte)
-
-
 Miscellaneous
 ^^^^^^^^^^^^^
 
diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index b06a06c8e..46b91ef7f 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -28,7 +28,7 @@ Future Things and Ideas
 - improve ANTLR grammar with better error handling (as suggested by Qwen AI)
 - add documentation for more library modules instead of just linking to the source code
 - add an Index to the documentation
-- allow memory() to occur in array initializer (maybe needed for 2 dimensional arrays?)
+- allow memory() to occur in array initializer (maybe needed for 2 dimensional arrays?) i.e. make it a constant (see github issue #192)
 - Two- or even multidimensional arrays and chained indexing, purely as syntactic sugar over regular arrays?
 - when a complete block is removed because unused, suppress all info messages about everything in the block being removed
 - is "checkAssignmentCompatible" redundant (gets called just 1 time!) when we also have "checkValueTypeAndRange" ?