diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+2024-11-07
+        * Version bump (4.1). (#561)
+
 2024-09-07
         * Version bump (4.0). (#532)
         * Add support for array updates. (#36)
diff --git a/copilot-interpreter.cabal b/copilot-interpreter.cabal
--- a/copilot-interpreter.cabal
+++ b/copilot-interpreter.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >=1.10
 name:                copilot-interpreter
-version:             4.0
+version:             4.1
 synopsis:            Interpreter for Copilot.
 description:
   Interpreter for Copilot.
@@ -44,7 +44,7 @@
     base       >= 4.9 && < 5,
     pretty     >= 1.0 && < 1.2,
 
-    copilot-core >= 4.0 && < 4.1
+    copilot-core >= 4.1 && < 4.2
 
   exposed-modules: