diff --git a/singletons-base/CHANGES.md b/singletons-base/CHANGES.md
index 407ec1b8..c0dc15de 100644
--- a/singletons-base/CHANGES.md
+++ b/singletons-base/CHANGES.md
@@ -1,7 +1,7 @@
 Changelog for the `singletons-base` project
 ===========================================
 
-3.4 [????.??.??]
+3.4 [2024.05.12]
 ----------------
 * Require building with GHC 9.10.
 
diff --git a/singletons-th/CHANGES.md b/singletons-th/CHANGES.md
index 6ec6b72e..7346de83 100644
--- a/singletons-th/CHANGES.md
+++ b/singletons-th/CHANGES.md
@@ -1,7 +1,7 @@
 Changelog for the `singletons-th` project
 =========================================
 
-3.4 [????.??.??]
+3.4 [2024.05.12]
 ----------------
 * Require building with GHC 9.10.
 * GHC 9.10 removes arity inference when kind-checking type families with