diff --git a/Project.toml b/Project.toml
index d61c254d..485b1371 100644
--- a/Project.toml
+++ b/Project.toml
@@ -66,6 +66,7 @@ ChainRules = "1.5"
 Combinatorics = "1"
 CompositeStructs = "0.1.1"
 DataStructures = "0.17.9, 0.18"
+Distributions = "0.25"
 EllipsisNotation = "1.1.0"
 FFTW = "1.4"
 FileIO = "1.2.2"
diff --git a/test/runtests.jl b/test/runtests.jl
index a9ca5cea..7e4c04bc 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -597,8 +597,8 @@ end
 
             δf,δϕ = simulate(Cf), simulate(Cϕ)
 
-            @test_real_gradient(α -> logpdf(      ds;  f  = f  + α * δf, ϕ  = ϕ  + α * δϕ), 0, atol=2)
-            @test_real_gradient(α -> logpdf(Mixed(ds); f° = f° + α * δf, ϕ° = ϕ° + α * δϕ), 0, atol=2)
+            @test_real_gradient(α -> logpdf(      ds;  f  = f  + α * δf, ϕ  = ϕ  + α * δϕ), 0, atol=3)
+            @test_real_gradient(α -> logpdf(Mixed(ds); f° = f° + α * δf, ϕ° = ϕ° + α * δϕ), 0, atol=3)
             
         end