diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+2023-01-07
+        * Version bump (3.13). (#406)
+
 2022-11-07
         * Version bump (3.12). (#389)
         * Add functionality for bisimulation proofs of Copilot specifications. (#363)
diff --git a/copilot-theorem.cabal b/copilot-theorem.cabal
--- a/copilot-theorem.cabal
+++ b/copilot-theorem.cabal
@@ -14,7 +14,7 @@
   <https://copilot-language.github.io>.
 
 
-version                   : 3.12
+version                   : 3.13
 license                   : BSD3
 license-file              : LICENSE
 maintainer                : Ivan Perez <ivan.perezdominguez@nasa.gov>
@@ -63,8 +63,8 @@
                           , xml                   >= 1.3 && < 1.4
                           , what4                 >= 1.3 && < 1.4
 
-                          , copilot-core          >= 3.12 && < 3.13
-                          , copilot-prettyprinter >= 3.12 && < 3.13
+                          , copilot-core          >= 3.13 && < 3.14
+                          , copilot-prettyprinter >= 3.13 && < 3.14
 
   exposed-modules         : Copilot.Theorem
                           , Copilot.Theorem.Prove