diff --git a/.github/workflows/Downgrade.yml b/.github/workflows/Downgrade.yml
new file mode 100644
index 00000000..32b6234b
--- /dev/null
+++ b/.github/workflows/Downgrade.yml
@@ -0,0 +1,29 @@
+name: Downgrade
+on:
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: ['1']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+      - uses: cjdoris/julia-downgrade-compat-action@v1
+#        if: ${{ matrix.version == '1.6' }}
+        with:
+          skip: Pkg,TOML
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
diff --git a/Project.toml b/Project.toml
index 64a49478..25769580 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,25 +26,25 @@ TruncatedStacktraces = "781d530d-4396-4725-bb49-402e4bee1e77"
 UnPack = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
 
 [compat]
-ApproxFun = "0.13"
-ArrayInterface = "7"
+ApproxFun = "0.13.25"
+ArrayInterface = "7.7"
 ConcreteStructs = "0.2.2"
-DiffEqBase = "6"
-FFTW = "1.0.0"
-ForwardDiff = "0.10"
-HypergeometricFunctions = "0.3.8"
-InvertedIndices = "1.1"
-LoopVectorization = "0.12"
-Polynomials = "2.0.24, 3, 4"
-RecipesBase = "1.2"
-Reexport = "1.0"
-SciMLBase = "1, 2"
-SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 2"
-SpecialMatrices = "2.0.0, 3"
-ToeplitzMatrices = "0.7.0, 0.8"
-TruncatedStacktraces = "1"
-UnPack = "1.0.0"
-julia = "1.2"
+DiffEqBase = "6.146.0"
+FFTW = "1.7.1"
+ForwardDiff = "0.10.36"
+HypergeometricFunctions = "0.3.23"
+InvertedIndices = "1.3.0"
+LoopVectorization = "0.12.168"
+Polynomials = "4.0.5"
+RecipesBase = "1.3"
+Reexport = "1.2.2"
+SciMLBase = "2.20.0"
+SpecialFunctions = "2.3.1"
+SpecialMatrices = "3.0.0"
+ToeplitzMatrices = "0.8.3"
+TruncatedStacktraces = "1.4.0"
+UnPack = "1.0.2"
+julia = "1.6"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"