diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+2021-07-07
+        * Version bump (3.4). (#231)
+
 2021-05-07
         * Version bump (3.3). (#217).
         * Adjust contraints on version of what4. (#90).
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                   : 3.3
+version                   : 3.4
 license                   : BSD3
 license-file              : LICENSE
 maintainer                : jonathan.laurent@ens.fr
@@ -72,7 +72,7 @@
                           , xml           >= 1.3 && < 1.4
                           , what4         >= 1.1 && < 1.2
 
-                          , copilot-core  >= 3.3 && < 3.4
+                          , copilot-core  >= 3.4 && < 3.5
 
   exposed-modules         : Copilot.Theorem
                           , Copilot.Theorem.Prove