diff --git a/.github/workflows/check-release.yml b/.github/workflows/check-release.yml
index 039875fc..19852dfd 100644
--- a/.github/workflows/check-release.yml
+++ b/.github/workflows/check-release.yml
@@ -28,7 +28,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Upload Distributions
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: jupyterlite-pyodide-kernel-releaser-dist-${{ github.run_number }}
           path: .jupyter_releaser_checkout/dist
diff --git a/.github/workflows/rtd-preview.yml b/.github/workflows/rtd-preview.yml
index b68b4c94..3651dfd6 100644
--- a/.github/workflows/rtd-preview.yml
+++ b/.github/workflows/rtd-preview.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Comment on the PR with the ReadTheDocs preview
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9dd5ba92..ea8e1868 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -65,14 +65,14 @@ jobs:
           cat *.txt
 
       - name: Upload extension packages
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: jupyterlite-pyodide-kernel-dist-${{ github.run_number }}
           path: dist
           if-no-files-found: error
 
       - name: Upload test config
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: pyproject-toml
           path: pyproject.toml
@@ -93,7 +93,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           name: jupyterlite-pyodide-kernel-dist-${{ github.run_number }}
@@ -147,7 +147,7 @@ jobs:
           cd tmp
           jupyter lite check || exit 1
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: pyproject-toml
 
@@ -165,7 +165,7 @@ jobs:
 
       - name: Upload reports
         if: always()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: |-
             jupyterlite-pyodide-kernel-pytest-${{ github.run_number }}-${{ matrix.os }}-${{ matrix.python-version}}
@@ -183,12 +183,12 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           name: jupyterlite-pyodide-kernel-dist-${{ github.run_number }}
@@ -218,9 +218,10 @@ jobs:
 
       - name: Upload Playwright Test report
         if: always()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: jupyterlite-pyodide-kernel-playwright-tests
+          name: |-
+            jupyterlite-pyodide-kernel-playwright-tests-${{ github.run_number }}-${{ matrix.project }}
           path: |
             ui-tests/test-results
             ui-tests/playwright-report
diff --git a/examples/jupyter-lite.json b/examples/jupyter-lite.json
index fbd0716d..3d396bdd 100644
--- a/examples/jupyter-lite.json
+++ b/examples/jupyter-lite.json
@@ -6,7 +6,7 @@
       "@jupyterlite/pyodide-kernel-extension:kernel": {
         "loadPyodideOptions": {
           "packages": ["matplotlib", "micropip", "numpy", "sqlite3", "ssl"],
-          "lockFileURL": "https://cdn.jsdelivr.net/pyodide/v0.26.2/full/pyodide-lock.json?from-lite-config=1"
+          "lockFileURL": "https://cdn.jsdelivr.net/pyodide/v0.26.3/full/pyodide-lock.json?from-lite-config=1"
         }
       }
     }
diff --git a/jupyterlite_pyodide_kernel/constants.py b/jupyterlite_pyodide_kernel/constants.py
index 4d27ba32..6e626122 100644
--- a/jupyterlite_pyodide_kernel/constants.py
+++ b/jupyterlite_pyodide_kernel/constants.py
@@ -29,7 +29,7 @@
 PYODIDE_URL_ENV_VAR = "JUPYTERLITE_PYODIDE_URL"
 
 #: probably only compatible with this version of pyodide
-PYODIDE_VERSION = "0.26.2"
+PYODIDE_VERSION = "0.26.3"
 
 #: the only kind of noarch wheel piplite understands
 NOARCH_WHL = "py3-none-any.whl"
diff --git a/packages/pyodide-kernel-extension/schema/kernel.v0.schema.json b/packages/pyodide-kernel-extension/schema/kernel.v0.schema.json
index 85ab5cff..faef7b18 100644
--- a/packages/pyodide-kernel-extension/schema/kernel.v0.schema.json
+++ b/packages/pyodide-kernel-extension/schema/kernel.v0.schema.json
@@ -8,7 +8,7 @@
     "pyodideUrl": {
       "description": "The path to the main pyodide.js entry point",
       "type": "string",
-      "default": "https://cdn.jsdelivr.net/pyodide/v0.26.2/full/pyodide.js",
+      "default": "https://cdn.jsdelivr.net/pyodide/v0.26.3/full/pyodide.js",
       "format": "uri"
     },
     "disablePyPIFallback": {
diff --git a/packages/pyodide-kernel-extension/src/index.ts b/packages/pyodide-kernel-extension/src/index.ts
index 204461c9..d4667bab 100644
--- a/packages/pyodide-kernel-extension/src/index.ts
+++ b/packages/pyodide-kernel-extension/src/index.ts
@@ -20,7 +20,7 @@ const KERNEL_ICON_URL = `data:image/svg+xml;base64,${btoa(KERNEL_ICON_SVG_STR)}`
 /**
  * The default CDN fallback for Pyodide
  */
-const PYODIDE_CDN_URL = 'https://cdn.jsdelivr.net/pyodide/v0.26.2/full/pyodide.js';
+const PYODIDE_CDN_URL = 'https://cdn.jsdelivr.net/pyodide/v0.26.3/full/pyodide.js';
 
 /**
  * The id for the extension, and key in the litePlugins.
diff --git a/packages/pyodide-kernel/package.json b/packages/pyodide-kernel/package.json
index 91c84b99..25b0afe8 100644
--- a/packages/pyodide-kernel/package.json
+++ b/packages/pyodide-kernel/package.json
@@ -66,7 +66,7 @@
     "@types/jest": "^29.5.4",
     "esbuild": "^0.19.2",
     "jest": "^29.7.0",
-    "pyodide": "0.26.2",
+    "pyodide": "0.26.3",
     "rimraf": "^5.0.1",
     "ts-jest": "^26.3.0",
     "typescript": "~5.2.2"
diff --git a/yarn.lock b/yarn.lock
index 6138c4fb..8c1bbdd2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2987,7 +2987,7 @@ __metadata:
     comlink: ^4.4.1
     esbuild: ^0.19.2
     jest: ^29.7.0
-    pyodide: 0.26.2
+    pyodide: 0.26.3
     rimraf: ^5.0.1
     ts-jest: ^26.3.0
     typescript: ~5.2.2
@@ -10895,12 +10895,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"pyodide@npm:0.26.2":
-  version: 0.26.2
-  resolution: "pyodide@npm:0.26.2"
+"pyodide@npm:0.26.3":
+  version: 0.26.3
+  resolution: "pyodide@npm:0.26.3"
   dependencies:
     ws: ^8.5.0
-  checksum: f8b11470a69f82609af9e1a1b76905dfd5baa42f86ce5488c44b82271af46252006bb73639f8d89aee11b9fb07d1e9de037ff5472aa76f1b4ff4e9fe09d7e839
+  checksum: d386789b815dc90af45d6832d365824c38e90a0e762a2a60dfd5493cd7fccf4e6b31327dc0671b465dde6cdd1a35554786ccf21ec01a8d903686c1c25ee980e4
   languageName: node
   linkType: hard