diff --git a/REQUIRE b/REQUIRE
index 72d94d227..7fb9f6bcc 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,4 +1,4 @@
 julia 0.3-
 ArrayViews 0.4.8-
-PDMats 0.2.2-
-StatsBase 0.5.1-
+PDMats 0.3-
+StatsBase 0.6.9-
diff --git a/src/conjugates/mvnormal.jl b/src/conjugates/mvnormal.jl
index 5ffd8ecf0..0393c946d 100644
--- a/src/conjugates/mvnormal.jl
+++ b/src/conjugates/mvnormal.jl
@@ -5,7 +5,7 @@
 function posterior_canon(prior::GenericMvNormal, ss::GenericMvNormalKnownSigmaStats)
     invΣ0 = inv(prior.Σ)
     μ0 = prior.μ
-    invΣp = add_scal(invΣ0, ss.invΣ, ss.tw)
+    invΣp = pdadd(invΣ0, ss.invΣ, ss.tw)
     h = add!(invΣ0 * μ0, ss.invΣ * ss.sx)
 	return GenericMvNormalCanon(h, invΣp)
 end