diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 35356e2..4378c5d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,7 +70,7 @@ jobs:
 
       - name: Upload coverage to artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-report
           path: coverage.xml
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index f9b6d47..1d8787b 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -74,7 +74,7 @@ jobs:
 
       - name: Upload SARIF results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: codeql-results-${{ matrix.language }}
           path: sarif-results
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index ea381e1..957408a 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -70,7 +70,7 @@ jobs:
           uv tool run safety check --file requirements-dev.txt --output text || true
 
       - name: Upload safety results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: safety-scan-results
@@ -122,7 +122,7 @@ jobs:
           fi
 
       - name: Upload license report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: license-report
           path: |
@@ -157,7 +157,7 @@ jobs:
           echo "Current lock file is up to date" >> outdated-report.md
 
       - name: Upload outdated report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: outdated-report
           path: outdated-report.md
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index fc1b8fa..4f47128 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -114,7 +114,7 @@ jobs:
 
       - name: Upload load test results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: load-test-results
           path: |
@@ -183,7 +183,7 @@ jobs:
 
       - name: Upload benchmark results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: benchmark-results
           path: |
@@ -229,7 +229,7 @@ jobs:
 
       - name: Upload memory profiling results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: memory-profiling-results
           path: |
@@ -313,7 +313,7 @@ jobs:
 
       - name: Upload k6 results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: k6-results
           path: k6-results.json
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 6dfa5c7..e96aae7 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -97,7 +97,7 @@ jobs:
           uv run pytest tests/ -v --tb=short --cov=src --cov-report=xml --cov-report=term --cov-report=html
 
       - name: Upload coverage report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-report-${{ matrix.python-version }}
           path: |
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2e7f7d0..ae4d083 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -119,7 +119,7 @@ jobs:
           uv build
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: release-artifacts
           path: dist/*
@@ -189,7 +189,7 @@ jobs:
           } >> $GITHUB_OUTPUT
 
       - name: Upload changelog
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: changelog
           path: CHANGELOG.md