diff --git a/Makefile b/Makefile
index bbf029dd..bd35c4bf 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ PLT_APPS = crypto public_key ssl
 # Dependencies.
 
 DEPS = cowlib ranch
-dep_cowlib = pkg://cowlib 0.5.1
+dep_cowlib = pkg://cowlib 0.6.0
 dep_ranch = pkg://ranch 0.9.0
 
 TEST_DEPS = ct_helper gun