diff --git a/Project.toml b/Project.toml
index 198739423..188f5b4ff 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "Turing"
 uuid = "fce5fe82-541a-59a6-adf8-730c64b5f9a0"
-version = "0.26.3"
+version = "0.26.4"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
@@ -50,7 +50,7 @@ DistributionsAD = "0.6"
 DocStringExtensions = "0.8, 0.9"
 DynamicPPL = "0.23"
 EllipticalSliceSampling = "0.5, 1"
-FillArrays = "=1.0.0"
+FillArrays = "1.4.1"
 ForwardDiff = "0.10.3"
 Libtask = "0.7, 0.8"
 LogDensityProblems = "2"
diff --git a/test/Project.toml b/test/Project.toml
index cec3c0d4b..f13306045 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -42,7 +42,7 @@ Distributions = "0.25"
 DistributionsAD = "0.6.3"
 DynamicHMC = "2.1.6, 3.0"
 DynamicPPL = "0.23"
-FillArrays = "=1.0.0"
+FillArrays = "1.4.1"
 FiniteDifferences = "0.10.8, 0.11, 0.12"
 ForwardDiff = "0.10.12 - 0.10.32, 0.10"
 LogDensityProblems = "2"
diff --git a/test/essential/ad.jl b/test/essential/ad.jl
index 0a60a3e0f..8a0241a83 100644
--- a/test/essential/ad.jl
+++ b/test/essential/ad.jl
@@ -95,15 +95,14 @@
         sample(dir(), HMC(0.01, 1), 1000)
         Turing.setrdcache(false)
     end
-    # FIXME: For some reasons PDMatDistribution AD tests fail with ReverseDiff
     @testset "PDMatDistribution AD" begin
         @model function wishart()
             theta ~ Wishart(4, Matrix{Float64}(I, 4, 4))
         end
         Turing.setadbackend(:tracker)
         sample(wishart(), HMC(0.01, 1), 1000);
-        #Turing.setadbackend(:reversediff)
-        #sample(wishart(), HMC(0.01, 1), 1000);
+        Turing.setadbackend(:reversediff)
+        sample(wishart(), HMC(0.01, 1), 1000);
         Turing.setadbackend(:zygote)
         sample(wishart(), HMC(0.01, 1), 1000);
 
@@ -112,8 +111,8 @@
         end
         Turing.setadbackend(:tracker)
         sample(invwishart(), HMC(0.01, 1), 1000);
-        #Turing.setadbackend(:reversediff)
-        #sample(invwishart(), HMC(0.01, 1), 1000);
+        Turing.setadbackend(:reversediff)
+        sample(invwishart(), HMC(0.01, 1), 1000);
         Turing.setadbackend(:zygote)
         sample(invwishart(), HMC(0.01, 1), 1000);
     end