diff --git a/.github/workflows/clang-tests.yml b/.github/workflows/clang-tests.yml
index d37637e4b927..c7ff6881fe95 100644
--- a/.github/workflows/clang-tests.yml
+++ b/.github/workflows/clang-tests.yml
@@ -33,7 +33,7 @@ jobs:
         arch: amd64
     - name: Install Ninja
       uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 250
     - name: Test clang
diff --git a/.github/workflows/libclang-abi-tests.yml b/.github/workflows/libclang-abi-tests.yml
index c7d1993ba006..26b921d745aa 100644
--- a/.github/workflows/libclang-abi-tests.yml
+++ b/.github/workflows/libclang-abi-tests.yml
@@ -26,7 +26,7 @@ jobs:
       LLVM_VERSION_PATCH: ${{ steps.version.outputs.LLVM_VERSION_PATCH }}
     steps:
       - name: Checkout source
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
         with:
           fetch-depth: 250
 
@@ -115,7 +115,7 @@ jobs:
           sed -i 's/LLVM_${{ matrix.llvm_version_major }}/LLVM_NOVERSION/' $lib-${{ matrix.ref }}.abi
         done
     - name: Upload ABI file
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ matrix.name }}
         path: "*${{ matrix.ref }}.abi"
@@ -127,11 +127,11 @@ jobs:
       - abi-dump
     steps:
       - name: Download baseline
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: build-baseline
       - name: Download latest
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: build-latest
 
@@ -144,7 +144,7 @@ jobs:
           done
       - name: Upload ABI Comparison
         if: always()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: compat-report-${{ github.sha }}
           path: compat_reports/
diff --git a/.github/workflows/libclc-tests.yml b/.github/workflows/libclc-tests.yml
index 6be01c839f44..789f86ebe689 100644
--- a/.github/workflows/libclc-tests.yml
+++ b/.github/workflows/libclc-tests.yml
@@ -36,7 +36,7 @@ jobs:
         arch: amd64
     - name: Install Ninja
       uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 250
     - name: Build clang
diff --git a/.github/workflows/lld-tests.yml b/.github/workflows/lld-tests.yml
index 1e5540d2fc4d..1997294feb1a 100644
--- a/.github/workflows/lld-tests.yml
+++ b/.github/workflows/lld-tests.yml
@@ -33,7 +33,7 @@ jobs:
         arch: amd64
     - name: Install Ninja
       uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 250
     - name: Test lld
diff --git a/.github/workflows/lldb-tests.yml b/.github/workflows/lldb-tests.yml
index 1658c0e001a0..412cd4dbc42c 100644
--- a/.github/workflows/lldb-tests.yml
+++ b/.github/workflows/lldb-tests.yml
@@ -38,7 +38,7 @@ jobs:
         arch: amd64
     - name: Install Ninja
       uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 250
     - name: Build lldb
diff --git a/.github/workflows/llvm-tests.yml b/.github/workflows/llvm-tests.yml
index bb011c0dafbb..ee7e17ff0fd5 100644
--- a/.github/workflows/llvm-tests.yml
+++ b/.github/workflows/llvm-tests.yml
@@ -31,7 +31,7 @@ jobs:
         arch: amd64
     - name: Install Ninja
       uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 250
     - name: Test llvm
@@ -50,7 +50,7 @@ jobs:
       LLVM_VERSION_PATCH: ${{ steps.version.outputs.LLVM_VERSION_PATCH }}
     steps:
       - name: Checkout source
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
         with:
           fetch-depth: 250
 
@@ -127,14 +127,14 @@ jobs:
         # Remove symbol versioning from dumps, so we can compare across major versions.
         sed -i 's/LLVM_${{ matrix.llvm_version_major }}/LLVM_NOVERSION/' ${{ matrix.ref }}.abi
     - name: Upload ABI file
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ matrix.name }}
         path: ${{ matrix.ref }}.abi
 
     - name: Upload symbol list file
       if: matrix.name == 'build-baseline'
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@v4
       with:
         name: symbol-list
         path: llvm.symbols
@@ -146,15 +146,15 @@ jobs:
       - abi-dump
     steps:
       - name: Download baseline
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: build-baseline
       - name: Download latest
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: build-latest
       - name: Download symbol list
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: symbol-list
 
@@ -172,7 +172,7 @@ jobs:
           abi-compliance-checker $EXTRA_ARGS -l libLLVM.so -old build-baseline/*.abi -new build-latest/*.abi || test "${{ needs.abi-dump-setup.outputs.ABI_HEADERS }}" = "llvm-c"
       - name: Upload ABI Comparison
         if: always()
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: compat-report-${{ github.sha }}
           path: compat_reports/
diff --git a/.github/workflows/patmos-ci.yml b/.github/workflows/patmos-ci.yml
index 1b4eb128608d..05a14235463d 100644
--- a/.github/workflows/patmos-ci.yml
+++ b/.github/workflows/patmos-ci.yml
@@ -37,7 +37,7 @@ jobs:
       CC: gcc
       CXX: g++
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build and Run LLVM Unit and Regression Tests
         uses: ./.github/actions/build-test-all
         with:
@@ -87,7 +87,7 @@ jobs:
       CXX: ${{matrix.cxx}}
     
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/install-dependencies
       - name: Build and Run LLVM Unit and Regression Tests
         uses: ./.github/actions/build-test-all
@@ -129,7 +129,7 @@ jobs:
       CXX: ${{matrix.cxx}}
     
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/install-dependencies
       - name: Build and Run LLVM Unit and Regression Tests
         uses: ./.github/actions/test-benchmarks
@@ -164,7 +164,7 @@ jobs:
       CXX: ${{matrix.cxx}}
     
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/install-dependencies
       - name: Build LLVM, Compiler-RT, Newlib, and Package
         uses: ./.github/actions/build-test-all
@@ -174,7 +174,7 @@ jobs:
           enable-tests: false
           artifact-name: package-${{matrix.platform}}
       - name: Publish
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
           files: ${{env.BUILD_PATH}}/patmos-unknown-unknown-elf/package-temp/patmos-llvm-*.tar.gz