diff --git a/CHANGELOG.md b/CHANGELOG.md
index cebc74d5a..f3a0c6ae8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # News
 
+## v0.6.4 - 2022-12-11
+
+- Move the API declarations to `QuantumInterface.jl`, a mostly namespacing package shared with `QuantumOptics.jl`.
+
 ## v0.6.3 - 2022-09-24
 
 - Bring the v0.6.2 performance improvements to Julia 1.7 and 1.6. Switch from using `constprop` to explicit static dispatch with `@valbooldispatch`.
diff --git a/Project.toml b/Project.toml
index 29665d3fb..431637c25 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "QuantumClifford"
 uuid = "0525e862-1e90-11e9-3e4d-1b39d7109de1"
 authors = ["Stefan Krastanov <stefan@krastanov.org>"]
-version = "0.6.3"
+version = "0.6.4"
 
 [deps]
 Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"