diff --git a/HISTORY.md b/HISTORY.md
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--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,9 @@
+# 0.39.7
+
+Update compatibility to AdvancedPS 0.7 and Libtask 0.9.
+
+These new libraries provide significant speedups for particle MCMC methods.
+
 # 0.39.6
 
 Bumped compatibility of AbstractPPL to include 0.13.