diff --git a/addons/Dexie.Observable/package-lock.json b/addons/Dexie.Observable/package-lock.json
index 0c93d77ca..c4823e6df 100644
--- a/addons/Dexie.Observable/package-lock.json
+++ b/addons/Dexie.Observable/package-lock.json
@@ -9,14 +9,14 @@
       "version": "3.0.0-beta.11",
       "license": "Apache-2.0",
       "devDependencies": {
-        "dexie": "^3.0.2",
+        "dexie": "^3.0.2 || ^4.0.0-alpha.1",
         "eslint": "^7.27.0",
         "just-build": "^0.9.19",
         "qunit": "^2.9.2",
         "uglify-js": "^3.5.6"
       },
       "peerDependencies": {
-        "dexie": "^3.0.2"
+        "dexie": "^3.0.2 || ^4.0.0-alpha.1"
       }
     },
     "node_modules/@babel/code-frame": {
diff --git a/addons/Dexie.Observable/package.json b/addons/Dexie.Observable/package.json
index bb50f7bfb..20daede43 100644
--- a/addons/Dexie.Observable/package.json
+++ b/addons/Dexie.Observable/package.json
@@ -79,10 +79,10 @@
   },
   "homepage": "https://dexie.org",
   "peerDependencies": {
-    "dexie": "^3.0.2"
+    "dexie": "^3.0.2 || ^4.0.0-alpha.1"
   },
   "devDependencies": {
-    "dexie": "^3.0.2",
+    "dexie": "^3.0.2 || ^4.0.0-alpha.1",
     "eslint": "^7.27.0",
     "just-build": "^0.9.19",
     "qunit": "^2.9.2",
diff --git a/addons/Dexie.Observable/src/Dexie.Observable.js b/addons/Dexie.Observable/src/Dexie.Observable.js
index dbd7ec525..0993893ea 100644
--- a/addons/Dexie.Observable/src/Dexie.Observable.js
+++ b/addons/Dexie.Observable/src/Dexie.Observable.js
@@ -60,8 +60,8 @@ var browserIsShuttingDown = false;
  * @param {Dexie} db 
  */
 function Observable(db) {
-    if (!/^3\./.test(Dexie.version))
-        throw new Error(`Missing dexie version 3.x`);
+    if (!/^(3|4)\./.test(Dexie.version))
+        throw new Error(`Missing dexie version 3.x or 4.x`);
     if (db.observable) {
         if (db.observable.version !== "{version}") throw new Error(`Mixed versions of dexie-observable`);
         return; // Addon already active.
diff --git a/addons/Dexie.Syncable/package-lock.json b/addons/Dexie.Syncable/package-lock.json
index 9f3067994..fbe1a010a 100644
--- a/addons/Dexie.Syncable/package-lock.json
+++ b/addons/Dexie.Syncable/package-lock.json
@@ -9,7 +9,7 @@
       "version": "3.0.0-beta.10",
       "license": "Apache-2.0",
       "devDependencies": {
-        "dexie": "^3.0.2",
+        "dexie": "^3.0.2 || ^4.0.0-alpha.1",
         "dexie-observable": "^3.0.0-beta.9",
         "eslint": "^5.16.0",
         "just-build": "^0.9.19",
@@ -17,7 +17,7 @@
         "uglify-js": "^3.5.6"
       },
       "peerDependencies": {
-        "dexie": "^3.0.2",
+        "dexie": "^3.0.2 || ^4.0.0-alpha.1",
         "dexie-observable": "^3.0.0-beta.9"
       }
     },
diff --git a/addons/Dexie.Syncable/package.json b/addons/Dexie.Syncable/package.json
index 424a3ef84..d1591b9a6 100644
--- a/addons/Dexie.Syncable/package.json
+++ b/addons/Dexie.Syncable/package.json
@@ -70,11 +70,11 @@
   },
   "homepage": "https://dexie.org",
   "peerDependencies": {
-    "dexie": "^3.0.2",
+    "dexie": "^3.0.2 || ^4.0.0-alpha.1",
     "dexie-observable": "^3.0.0-beta.9"
   },
   "devDependencies": {
-    "dexie": "^3.0.2",
+    "dexie": "^3.0.2 || ^4.0.0-alpha.1",
     "dexie-observable": "^3.0.0-beta.9",
     "eslint": "^5.16.0",
     "just-build": "^0.9.19",
diff --git a/addons/Dexie.Syncable/src/Dexie.Syncable.js b/addons/Dexie.Syncable/src/Dexie.Syncable.js
index 4654e6bf5..9feb4af3c 100644
--- a/addons/Dexie.Syncable/src/Dexie.Syncable.js
+++ b/addons/Dexie.Syncable/src/Dexie.Syncable.js
@@ -37,10 +37,10 @@ var override = Dexie.override,
  * @param {Dexie} db 
  */
 function Syncable (db) {
-    if (!/^3\./.test(Dexie.version))
-        throw new Error(`Missing dexie version 3.x`);
-    if (!db.observable || (db.observable.version !== "{version}" && !/^3\./.test(db.observable.version)))
-        throw new Error(`Missing dexie-observable version 3.x`);
+    if (!/^(3|4)\./.test(Dexie.version))
+        throw new Error(`Missing dexie version 3.x or 4.x`);
+    if (!db.observable || (db.observable.version !== "{version}" && !/^(3|4)\./.test(db.observable.version)))
+        throw new Error(`Missing dexie-observable version 3.x or 4.x`);
     if (db.syncable) {
         if (db.syncable.version !== "{version}") throw new Error(`Mixed versions of dexie-syncable`);
         return; // Addon already active.
diff --git a/addons/dexie-cloud/package-lock.json b/addons/dexie-cloud/package-lock.json
index 49f6e6290..1ce63cea9 100644
--- a/addons/dexie-cloud/package-lock.json
+++ b/addons/dexie-cloud/package-lock.json
@@ -37,7 +37,7 @@
         "node": ">=14"
       },
       "peerDependencies": {
-        "dexie": "^3.2.0-beta.2"
+        "dexie": "^3.2.0-beta.2 || ^4.0.0-alpha.1"
       }
     },
     "node_modules/@rollup/plugin-commonjs": {
diff --git a/addons/dexie-cloud/package.json b/addons/dexie-cloud/package.json
index a01b1fb64..7102e1d7c 100644
--- a/addons/dexie-cloud/package.json
+++ b/addons/dexie-cloud/package.json
@@ -109,6 +109,6 @@
     "rxjs": "^7.4.0"
   },
   "peerDependencies": {
-    "dexie": "^3.2.0-beta.2"
+    "dexie": "^3.2.0-beta.2 || ^4.0.0-alpha.1"
   }
 }
diff --git a/addons/dexie-export-import/package-lock.json b/addons/dexie-export-import/package-lock.json
index 4a9ef6f58..b2e3e4078 100644
--- a/addons/dexie-export-import/package-lock.json
+++ b/addons/dexie-export-import/package-lock.json
@@ -5,6 +5,7 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "dexie-export-import",
       "version": "1.0.3",
       "license": "Apache-2.0",
       "devDependencies": {
@@ -18,7 +19,7 @@
         "typeson-registry": "^1.0.0-alpha.21"
       },
       "peerDependencies": {
-        "dexie": "^3.0.0 || ^2.0.4"
+        "dexie": "^2.0.4 || ^3.0.0 || ^4.0.0-alpha.1"
       }
     },
     "node_modules/@rollup/plugin-alias": {
diff --git a/addons/dexie-export-import/package.json b/addons/dexie-export-import/package.json
index fe4d042c1..73644af83 100644
--- a/addons/dexie-export-import/package.json
+++ b/addons/dexie-export-import/package.json
@@ -43,6 +43,6 @@
     "typeson-registry": "^1.0.0-alpha.21"
   },
   "peerDependencies": {
-    "dexie": "^3.0.0 || ^2.0.4"
+    "dexie": "^2.0.4 || ^3.0.0 || ^4.0.0-alpha.1"
   }
 }