diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+2024-07-07
+        * Version bump (3.20). (#522)
+
 2024-05-07
         * Version bump (3.19.1). (#512)
 
diff --git a/copilot-libraries.cabal b/copilot-libraries.cabal
--- a/copilot-libraries.cabal
+++ b/copilot-libraries.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >=1.10
 name:                copilot-libraries
-version:             3.19.1
+version:             3.20
 synopsis:            Libraries for the Copilot language.
 description:
   Libraries for the Copilot language.
@@ -36,12 +36,12 @@
 
   hs-source-dirs: src
 
-  build-depends: base             >= 4.9    && < 5
+  build-depends: base             >= 4.9  && < 5
 
-               , containers       >= 0.4    && < 0.7
-               , mtl              >= 2.0    && < 2.4
-               , parsec           >= 2.0    && < 3.2
-               , copilot-language >= 3.19.1 && < 3.20
+               , containers       >= 0.4  && < 0.7
+               , mtl              >= 2.0  && < 2.4
+               , parsec           >= 2.0  && < 3.2
+               , copilot-language >= 3.20 && < 3.21
 
   exposed-modules:
       Copilot.Library.Libraries