diff --git a/.changeset/drop-react-17-packages-ui.md b/.changeset/drop-react-17-packages-ui.md
new file mode 100644
index 0000000000..710f6e5b42
--- /dev/null
+++ b/.changeset/drop-react-17-packages-ui.md
@@ -0,0 +1,5 @@
+---
+'@backstage/ui': minor
+---
+
+**BREAKING**: Dropped support for React 17. The minimum supported React version is now 18.
diff --git a/packages/ui/package.json b/packages/ui/package.json
index e62add25ac..6eaa903c90 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -67,9 +67,9 @@
     "storybook": "^10.3.0-alpha.1"
   },
   "peerDependencies": {
-    "@types/react": "^17.0.0 || ^18.0.0",
-    "react": "^17.0.0 || ^18.0.0",
-    "react-dom": "^17.0.0 || ^18.0.0",
+    "@types/react": "^18.0.0",
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
     "react-router-dom": "^6.30.2"
   },
   "peerDependenciesMeta": {
diff --git a/yarn.lock b/yarn.lock
index fd201d7eea..df1ee4033c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7949,9 +7949,9 @@ __metadata:
     storybook: "npm:^10.3.0-alpha.1"
     use-sync-external-store: "npm:^1.4.0"
   peerDependencies:
-    "@types/react": ^17.0.0 || ^18.0.0
-    react: ^17.0.0 || ^18.0.0
-    react-dom: ^17.0.0 || ^18.0.0
+    "@types/react": ^18.0.0
+    react: ^18.0.0
+    react-dom: ^18.0.0
     react-router-dom: ^6.30.2
   peerDependenciesMeta:
     "@types/react":