diff --git a/doc/release-notes/rl-2505.section.md b/doc/release-notes/rl-2505.section.md
index b7aad1e44a37..65026b4df91a 100644
--- a/doc/release-notes/rl-2505.section.md
+++ b/doc/release-notes/rl-2505.section.md
@@ -1,4 +1,4 @@
-# Nixpkgs 25.05 (2025.05/??) {#sec-nixpkgs-release-25.05}
+# Nixpkgs 25.05 (2025.05/23) {#sec-nixpkgs-release-25.05}
 
 ## Highlights {#sec-nixpkgs-release-25.05-highlights}
 
diff --git a/nixos/doc/manual/release-notes/rl-2505.section.md b/nixos/doc/manual/release-notes/rl-2505.section.md
index 5dab691dc408..50cd00ea43c3 100644
--- a/nixos/doc/manual/release-notes/rl-2505.section.md
+++ b/nixos/doc/manual/release-notes/rl-2505.section.md
@@ -1,4 +1,4 @@
-# Release 25.05 (“Warbler”, 2025.05/??) {#sec-release-25.05}
+# Release 25.05 (“Warbler”, 2025.05/23) {#sec-release-25.05}
 
 ## Highlights {#sec-release-25.05-highlights}