diff --git a/.github/workflows/actions.yml b/.github/workflows/actions.yml
index 12690f691..5fbc7a62e 100644
--- a/.github/workflows/actions.yml
+++ b/.github/workflows/actions.yml
@@ -102,7 +102,7 @@ jobs:
           cat style.diff
           set -e
       - name: Upload Diffs
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ steps.check-for-diffs.outputs.differs == '1' }}
         with:
           name: code-style.diff
@@ -282,7 +282,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(sysctl -n hw.logicalcpu) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
@@ -357,7 +357,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(nproc) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
@@ -454,11 +454,11 @@ jobs:
         run: |
           Import-VisualStudioVars -VisualStudioVersion 2022 -Architecture ${{ matrix.arch }}
           cmake --build obj --config RelWithDebInfo --target pack-msi
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}-${{ matrix.arch }}
           path: pfx/**/*
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}-${{ matrix.arch }}-msi
           path: obj/dist/msi/*.msi
@@ -496,7 +496,7 @@ jobs:
             -G Ninja
       - name: Create source tarball
         run: cmake --build obj --target package_source
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: source-tarball
           path: obj/transmission*.tar.*
@@ -521,7 +521,7 @@ jobs:
         if: ${{ needs.what-to-make.outputs.make-qt == 'true' }}
         run: brew install qt
       - name: Get Source
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: source-tarball
       - name: Extract Source
@@ -563,7 +563,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(sysctl -n hw.logicalcpu) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
@@ -610,7 +610,7 @@ jobs:
         if: ${{ needs.what-to-make.outputs.make-qt == 'true' }}
         run: apt-get install -y --no-install-recommends qtbase5-dev libqt5svg5-dev qttools5-dev
       - name: Get Source
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: source-tarball
       - name: Extract Source
@@ -640,7 +640,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(nproc) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
@@ -686,7 +686,7 @@ jobs:
         if: ${{ needs.what-to-make.outputs.make-qt == 'true' }}
         run: dnf install -y qt6-qtbase-devel qt6-qtsvg-devel qt6-qttools-devel
       - name: Get Source
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: source-tarball
       - name: Extract Source
@@ -717,7 +717,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(nproc) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
@@ -759,7 +759,7 @@ jobs:
         if: ${{ needs.what-to-make.outputs.make-qt == 'true' }}
         run: sudo apt-get install -y --no-install-recommends qtbase5-dev libqt5svg5-dev qttools5-dev
       - name: Get Source
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: source-tarball
       - name: Extract Source
@@ -791,7 +791,7 @@ jobs:
         run: cmake -E chdir obj ctest -j $(nproc) --build-config RelWithDebInfo --output-on-failure
       - name: Install
         run: cmake --build obj --config RelWithDebInfo --target install/strip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: binaries-${{ github.job }}
           path: pfx/**/*
diff --git a/.github/workflows/webapp.yml b/.github/workflows/webapp.yml
index 997d66ac4..353876081 100644
--- a/.github/workflows/webapp.yml
+++ b/.github/workflows/webapp.yml
@@ -79,7 +79,7 @@ jobs:
           echo ===
           set -e # undo set +e
       - name: Upload diffs
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ steps.check-for-diffs.outputs.differs == '1' }}
         with:
           name: code-style.diff