diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b8add2e..d803557 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -79,7 +79,7 @@ jobs:
       - name: Run tests
         run: dotnet test --no-build --collect:"XPlat Code Coverage"
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (MacOS)
           path: "**/coverage.cobertura.xml"
@@ -103,7 +103,7 @@ jobs:
       - name: Run tests
         run: dotnet test --no-build --collect:"XPlat Code Coverage"
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (Ubuntu)
           path: "**/coverage.cobertura.xml"
@@ -127,7 +127,7 @@ jobs:
       - name: Run tests
         run: dotnet test --no-build --collect:"XPlat Code Coverage"
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (Windows)
           path: "**/coverage.cobertura.xml"
diff --git a/.github/workflows/ci-stryker.yml b/.github/workflows/ci-stryker.yml
index f1675f8..5f21202 100644
--- a/.github/workflows/ci-stryker.yml
+++ b/.github/workflows/ci-stryker.yml
@@ -36,7 +36,7 @@ jobs:
           ../../tools/dotnet-stryker -f ../.github/stryker/Stryker.Config.json -v "${GITHUB_HEAD_REF}" -r "html" -r "cleartext" --since:main
           mv ./StrykerOutput/**/reports/*.html ./StrykerOutput/Reports/Testably.Abstractions.FluentAssertions-report.html
       - name: Upload Stryker reports
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Stryker
           path: Tests/StrykerOutput/Reports/*
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6674ed1..fd7efa7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,12 +26,12 @@ jobs:
         run: dotnet test --no-build --collect:"XPlat Code Coverage" --logger trx --results-directory "TestResults"
       - name: Upload test results (MacOS)
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Test results (MacOS)
           path: TestResults
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (MacOS)
           path: "**/coverage.cobertura.xml"
@@ -56,12 +56,12 @@ jobs:
         run: dotnet test --no-build --collect:"XPlat Code Coverage" --logger trx --results-directory "TestResults"
       - name: Upload test results (Ubuntu)
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Test results (Ubuntu)
           path: TestResults
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (Ubuntu)
           path: "**/coverage.cobertura.xml"
@@ -86,12 +86,12 @@ jobs:
         run: dotnet test --no-build --collect:"XPlat Code Coverage" --logger trx --results-directory "TestResults"
       - name: Upload test results (Windows)
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Test results (Windows)
           path: TestResults
       - name: Upload coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Code coverage (Windows)
           path: "**/coverage.cobertura.xml"
@@ -116,7 +116,7 @@ jobs:
         run: vstest.console.exe .\Build\Tests\Testably.Abstractions.FluentAssertions.Tests\net48\Testably.Abstractions.FluentAssertions.Tests.dll /Logger:trx /ResultsDirectory:TestResults
       - name: Upload test results (.NET Framework)
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Test results (.NET Framework)
           path: TestResults