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)
         * Document installation process without git submodules. (#214)
diff --git a/copilot.cabal b/copilot.cabal
--- a/copilot.cabal
+++ b/copilot.cabal
@@ -1,5 +1,5 @@
 name:                copilot
-version:             3.3
+version:             3.4
 cabal-version:       >= 1.10
 license:             BSD3
 license-file:        LICENSE
@@ -50,11 +50,11 @@
                      , directory            >= 1.3  && < 1.4
                      , filepath             >= 1.4  && < 1.5
 
-                     , copilot-core         >= 3.3  && < 3.4
-                     , copilot-theorem      >= 3.3  && < 3.4
-                     , copilot-language     >= 3.3  && < 3.4
-                     , copilot-libraries    >= 3.3  && < 3.4
-                     , copilot-c99          >= 3.3  && < 3.4
+                     , copilot-core         >= 3.4  && < 3.5
+                     , copilot-theorem      >= 3.4  && < 3.5
+                     , copilot-language     >= 3.4  && < 3.5
+                     , copilot-libraries    >= 3.4  && < 3.5
+                     , copilot-c99          >= 3.4  && < 3.5
 
 
     exposed-modules: Language.Copilot, Language.Copilot.Main