diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 30b1e5c1c..0128eff64 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -163,7 +163,7 @@ jobs:
     # Save the test-renderers results so we can download and view them
     - name: Save test-renderers output
       if: ${{ always() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test-renderers-output ${{ matrix.os }} ${{ matrix.toolchain }} ${{ matrix.depversions }}
         path: |
@@ -179,7 +179,7 @@ jobs:
     # (for understanding build performance in CI)
     - name: Save cargo --timings output
       if: ${{ always() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cargo-timings ${{ matrix.os }} ${{ matrix.toolchain }} ${{ matrix.depversions }}
         path: |
@@ -189,7 +189,7 @@ jobs:
     # (but only for the stablest matrix version)
     - name: Save wasm dist artifact
       if: ${{ matrix.primary }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: wasm-dist
         path: all-is-cubes-wasm/dist
@@ -289,7 +289,7 @@ jobs:
     # (for understanding build performance in CI)
     - name: Save cargo --timings output
       if: ${{ always() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cargo-timings features
         path: |
@@ -381,7 +381,7 @@ jobs:
     # Save the fuzz artifacts so we can repro elsewhere
     - name: Save fuzz artifacts
       if: ${{ failure() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: fuzz-artifacts
         path: fuzz/artifacts
diff --git a/.github/workflows/mutants.yml b/.github/workflows/mutants.yml
index 4b132fb40..1222a06f4 100644
--- a/.github/workflows/mutants.yml
+++ b/.github/workflows/mutants.yml
@@ -38,7 +38,7 @@ jobs:
 
       - name: Save results
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: mutation-report
           path: "*/mutants.out"
diff --git a/.github/workflows/unstable-ci.yml b/.github/workflows/unstable-ci.yml
index 86dd6bb36..cb3204c4c 100644
--- a/.github/workflows/unstable-ci.yml
+++ b/.github/workflows/unstable-ci.yml
@@ -116,7 +116,7 @@ jobs:
     # Save the test-renderers results so we can download and view them
     - name: Save test-renderers output
       if: ${{ always() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test-renderers-output ${{ matrix.os }} ${{ matrix.toolchain }} ${{ matrix.depversions }}
         path: |
@@ -129,7 +129,7 @@ jobs:
     # (for understanding build performance in CI)
     - name: Save cargo --timings output
       if: ${{ always() }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cargo-timings ${{ matrix.os }} ${{ matrix.toolchain }} ${{ matrix.depversions }}
         path: |