diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bab7876a5..887c985c8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.3' # Replace this with the minimum Julia version that your package supports.
+          - '1.6' # Replace this with the minimum Julia version that your package supports.
           - '1'   # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os:
diff --git a/Project.toml b/Project.toml
index 666b2fd7c..66dc1ce78 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,7 +24,7 @@ ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 
 [compat]
 AbstractFFTs = "0.5, 1.0"
-ChainRules = "1.5"
+ChainRules = "1.33"
 ChainRulesCore = "1.9"
 ChainRulesTestUtils = "1"
 DiffRules = "1.0"
@@ -37,7 +37,7 @@ Requires = "1.1"
 SpecialFunctions = "1.6, 2"
 StatsFuns = "0.9.8"
 ZygoteRules = "0.2.1"
-julia = "1.3"
+julia = "1.6"
 
 [extras]
 CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
diff --git a/src/lib/array.jl b/src/lib/array.jl
index f492af9e6..548159766 100644
--- a/src/lib/array.jl
+++ b/src/lib/array.jl
@@ -741,12 +741,6 @@ end
   end
 end
 
-@adjoint function logdet(C::Cholesky)
-  return logdet(C), function(Δ)
-    return ((uplo=nothing, info=nothing, factors=Diagonal(2 .* Δ ./ diag(C.factors))),)
-  end
-end
-
 @adjoint function Matrix(S::UniformScaling, i::Integer, j::Integer)
   return Matrix(S, i, j), Δ -> ((λ=tr(Δ),), nothing, nothing)
 end