diff --git a/yam.cabal b/yam.cabal
--- a/yam.cabal
+++ b/yam.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.12
 name: yam
-version: 0.6.2
+version: 0.6.3
 license: BSD3
 license-file: LICENSE
 copyright: (c) 2018 Daniel YU
@@ -74,7 +74,7 @@
         servant-server ==0.16.*,
         servant-swagger >=1.1.7.1 && <1.2,
         servant-swagger-ui >=0.3.3.3.22.2 && <0.4,
-        swagger2 ==2.4.*,
+        swagger2 >=2.3.0.1 && <2.5,
         text >=1.2.3.1 && <1.3,
         transformers >=0.5.6.2 && <0.6,
         unliftio-core >=0.1.2.0 && <0.2,
@@ -146,7 +146,7 @@
         servant-server ==0.16.*,
         servant-swagger >=1.1.7.1 && <1.2,
         servant-swagger-ui >=0.3.3.3.22.2 && <0.4,
-        swagger2 ==2.4.*,
+        swagger2 >=2.3.0.1 && <2.5,
         text >=1.2.3.1 && <1.3,
         transformers >=0.5.6.2 && <0.6,
         unliftio-core >=0.1.2.0 && <0.2,