diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index e104d019..d04a63a9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -36,12 +36,12 @@ jobs:
             os: windows-latest
             arch: x64
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:
@@ -59,8 +59,9 @@ jobs:
           GROUP: AbstractGPs
       - uses: julia-actions/julia-processcoverage@v1
         if: matrix.version == '1' && matrix.os == 'ubuntu-latest'
-      - name: Send coverage
+      - uses: codecov/codecov-action@v5
         if: matrix.version == '1' && matrix.os == 'ubuntu-latest'
-        uses: codecov/codecov-action@v1
         with:
-          file: lcov.info
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: false
diff --git a/.github/workflows/PPL.yml b/.github/workflows/PPL.yml
index 9f915c5f..40650247 100644
--- a/.github/workflows/PPL.yml
+++ b/.github/workflows/PPL.yml
@@ -26,12 +26,12 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 06b8dbe4..ebe1ac4b 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -13,7 +13,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@latest
         with:
           version: 1
diff --git a/examples/2-deep-kernel-learning/script.jl b/examples/2-deep-kernel-learning/script.jl
index 9605114c..9ce11164 100644
--- a/examples/2-deep-kernel-learning/script.jl
+++ b/examples/2-deep-kernel-learning/script.jl
@@ -70,7 +70,7 @@ plot!(vcat(x_test...), mean.(pred_init); ribbon=std.(pred_init), label="Predicti
 
 # ## Training
 nmax = 200
-opt = Flux.ADAM(0.1)
+opt = Flux.Adam(0.1)
 
 anim = Animation()
 for i in 1:nmax