diff --git a/package-lock.json b/package-lock.json
index 53499a0..15359d8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "Apache-2.0",
       "dependencies": {
         "@etherisc/gif-interface": "2.0.0-a8c9822",
-        "@openzeppelin/contracts": "4.7.3"
+        "@openzeppelin/contracts": "5.0.0"
       }
     },
     "node_modules/@etherisc/gif-interface": {
@@ -21,10 +21,15 @@
         "@openzeppelin/contracts": "4.7.3"
       }
     },
-    "node_modules/@openzeppelin/contracts": {
+    "node_modules/@etherisc/gif-interface/node_modules/@openzeppelin/contracts": {
       "version": "4.7.3",
       "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.3.tgz",
       "integrity": "sha512-dGRS0agJzu8ybo44pCIf3xBaPQN/65AIXNgK8+4gzKd5kbvlqyxryUYVLJv7fK98Seyd2hDZzVEHSWAh0Bt1Yw=="
+    },
+    "node_modules/@openzeppelin/contracts": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-5.0.0.tgz",
+      "integrity": "sha512-bv2sdS6LKqVVMLI5+zqnNrNU/CA+6z6CmwFXm/MzmOPBRSO5reEJN7z0Gbzvs0/bv/MZZXNklubpwy3v2+azsw=="
     }
   },
   "dependencies": {
@@ -34,12 +39,19 @@
       "integrity": "sha512-mir/znqegL3rEBMLacvyyyjq2/mt0TCQhDAmub6bPuItLy7wiC/jNvnf9I9pKcCDt/VdBa0bjNO4L2iL44HXiA==",
       "requires": {
         "@openzeppelin/contracts": "4.7.3"
+      },
+      "dependencies": {
+        "@openzeppelin/contracts": {
+          "version": "4.7.3",
+          "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.3.tgz",
+          "integrity": "sha512-dGRS0agJzu8ybo44pCIf3xBaPQN/65AIXNgK8+4gzKd5kbvlqyxryUYVLJv7fK98Seyd2hDZzVEHSWAh0Bt1Yw=="
+        }
       }
     },
     "@openzeppelin/contracts": {
-      "version": "4.7.3",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.3.tgz",
-      "integrity": "sha512-dGRS0agJzu8ybo44pCIf3xBaPQN/65AIXNgK8+4gzKd5kbvlqyxryUYVLJv7fK98Seyd2hDZzVEHSWAh0Bt1Yw=="
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-5.0.0.tgz",
+      "integrity": "sha512-bv2sdS6LKqVVMLI5+zqnNrNU/CA+6z6CmwFXm/MzmOPBRSO5reEJN7z0Gbzvs0/bv/MZZXNklubpwy3v2+azsw=="
     }
   }
 }
diff --git a/package.json b/package.json
index c3a5498..7cf9725 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,6 @@
   },
   "dependencies": {
     "@etherisc/gif-interface": "2.0.0-a8c9822",
-    "@openzeppelin/contracts": "4.7.3"
+    "@openzeppelin/contracts": "5.0.0"
   }
 }