diff --git a/package.json b/package.json
index 0893783..4a213f9 100644
--- a/package.json
+++ b/package.json
@@ -47,16 +47,16 @@
 		"supports-color": "^5.3.0"
 	},
 	"devDependencies": {
-		"ava": "*",
+		"ava": "0.25.0",
 		"coveralls": "^3.0.0",
-		"execa": "^0.9.0",
-		"flow-bin": "^0.68.0",
+		"execa": "^0.10.0",
+		"flow-bin": "^0.73.0",
 		"import-fresh": "^2.0.0",
 		"matcha": "^0.7.0",
 		"nyc": "^11.0.2",
 		"resolve-from": "^4.0.0",
 		"typescript": "^2.5.3",
-		"xo": "*"
+		"xo": "0.20.3"
 	},
 	"types": "types/index.d.ts",
 	"xo": {