diff --git a/ChangeLog b/ChangeLog
index 29dc1a00ce..f4d3e20bf4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-## [17.0.0-beta.1] - unreleased
+## [17.0.0-beta.1] - 2026-09-08
 
 ### Added
 - Added `History` and `HistoryTransition`, formalizing a node's identity as the sequence of
diff --git a/build_support/GAMBIT_VERSION b/build_support/GAMBIT_VERSION
index b90da9845d..89c0dd9521 100644
--- a/build_support/GAMBIT_VERSION
+++ b/build_support/GAMBIT_VERSION
@@ -1 +1 @@
-17.0.0-alpha.3
+17.0.0-beta.1