diff --git a/moonbit-tour/package.json b/moonbit-tour/package.json
index 5e8484fc..3acfc4de 100644
--- a/moonbit-tour/package.json
+++ b/moonbit-tour/package.json
@@ -29,7 +29,7 @@
     "remark-rehype": "^11.1.1",
     "serve": "^14.2.4",
     "shiki": "^3.6.0",
-    "tailwindcss": "^3.4.16",
+    "tailwindcss": "^4.1.12",
     "tsx": "^4.19.2",
     "typescript": "~5.8.3",
     "unified": "^11.0.5",
diff --git a/moonbit-tour/pnpm-lock.yaml b/moonbit-tour/pnpm-lock.yaml
index 4ea5d0f4..8cea377f 100644
--- a/moonbit-tour/pnpm-lock.yaml
+++ b/moonbit-tour/pnpm-lock.yaml
@@ -17,7 +17,7 @@ importers:
     devDependencies:
       '@tailwindcss/typography':
         specifier: ^0.5.16
-        version: 0.5.16(tailwindcss@3.4.17)
+        version: 0.5.16(tailwindcss@4.1.12)
       '@types/node':
         specifier: ^22.10.2
         version: 22.15.32
@@ -67,8 +67,8 @@ importers:
         specifier: ^3.6.0
         version: 3.6.0
       tailwindcss:
-        specifier: ^3.4.16
-        version: 3.4.17
+        specifier: ^4.1.12
+        version: 4.1.12
       tsx:
         specifier: ^4.19.2
         version: 4.20.3
@@ -2260,6 +2260,9 @@ packages:
     engines: {node: '>=14.0.0'}
     hasBin: true
 
+  tailwindcss@4.1.12:
+    resolution: {integrity: sha512-DzFtxOi+7NsFf7DBtI3BJsynR+0Yp6etH+nRPTbpWnS2pZBaSksv/JGctNwSWzbFjp0vxSqknaUylseZqMDGrA==}
+
   thenify-all@1.6.0:
     resolution: {integrity: sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==}
     engines: {node: '>=0.8'}
@@ -2663,13 +2666,13 @@ snapshots:
 
   '@shikijs/vscode-textmate@10.0.2': {}
 
-  '@tailwindcss/typography@0.5.16(tailwindcss@3.4.17)':
+  '@tailwindcss/typography@0.5.16(tailwindcss@4.1.12)':
     dependencies:
       lodash.castarray: 4.4.0
       lodash.isplainobject: 4.0.6
       lodash.merge: 4.6.2
       postcss-selector-parser: 6.0.10
-      tailwindcss: 3.4.17
+      tailwindcss: 4.1.12
 
   '@types/debug@4.1.12':
     dependencies:
@@ -4944,6 +4947,8 @@ snapshots:
     transitivePeerDependencies:
       - ts-node
 
+  tailwindcss@4.1.12: {}
+
   thenify-all@1.6.0:
     dependencies:
       thenify: 3.3.1