diff --git a/package-lock.json b/package-lock.json
index 3ace106..408e6a3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -98,7 +98,7 @@
         "webpack-cli": "^4.9.2"
       },
       "peerDependencies": {
-        "@open-wc/dedupe-mixin": "^1.3.0",
+        "@open-wc/dedupe-mixin": "1.4.0",
         "@polymer/polymer": "3.5.1",
         "@vaadin/a11y-base": "24.3.15",
         "@vaadin/accordion": "24.3.15",
diff --git a/package.json b/package.json
index 569a7e7..e3fa54b 100644
--- a/package.json
+++ b/package.json
@@ -126,7 +126,7 @@
     "@vaadin/a11y-base": "24.3.15"
   },
   "peerDependencies": {
-    "@open-wc/dedupe-mixin": "^1.3.0",
+    "@open-wc/dedupe-mixin": "1.4.0",
     "@polymer/polymer": "3.5.1",
     "@vaadin/a11y-base": "24.3.15",
     "@vaadin/accordion": "24.3.15",
@@ -425,4 +425,4 @@
       "optional": true
     }
   }
-}
+}
\ No newline at end of file