diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+1.1.1
+---
+* Fixes:
+    * `CollectionFormat Param` -> `CollectionFormat ParamOtherSchema`;
+      this change was necessary after putting `CollectionFormat` to `SwaggerItems`.
+
 1.1
 ---
 * Major changes:
diff --git a/src/Data/Swagger/Internal.hs b/src/Data/Swagger/Internal.hs
--- a/src/Data/Swagger/Internal.hs
+++ b/src/Data/Swagger/Internal.hs
@@ -439,7 +439,7 @@
   -- Corresponds to multiple parameter instances
   -- instead of multiple values for a single instance @foo=bar&foo=baz@.
   -- This is valid only for parameters in @'ParamQuery'@ or @'ParamFormData'@.
-  CollectionMulti :: CollectionFormat Param
+  CollectionMulti :: CollectionFormat ParamOtherSchema
 
 deriving instance Eq (CollectionFormat t)
 deriving instance Show (CollectionFormat t)
@@ -460,7 +460,7 @@
   toConstr = collectionFormatConstr
   dataTypeOf _ = collectionFormatDataType
 
-deriving instance {-# OVERLAPPING #-} Data (CollectionFormat Param)
+deriving instance {-# OVERLAPPING #-} Data (CollectionFormat ParamOtherSchema)
 
 type ParamName = Text
 
@@ -1144,7 +1144,7 @@
 instance {-# OVERLAPPABLE #-} FromJSON (CollectionFormat t) where
   parseJSON = parseOneOf [CollectionCSV, CollectionSSV, CollectionTSV, CollectionPipes]
 
-instance FromJSON (CollectionFormat Param) where
+instance FromJSON (CollectionFormat ParamOtherSchema) where
   parseJSON = parseOneOf [CollectionCSV, CollectionSSV, CollectionTSV, CollectionPipes, CollectionMulti]
 
 -- NOTE: The constraints @FromJSON (SwaggerType t)@ and
diff --git a/swagger2.cabal b/swagger2.cabal
--- a/swagger2.cabal
+++ b/swagger2.cabal
@@ -1,5 +1,5 @@
 name:                swagger2
-version:             1.1
+version:             1.1.1
 synopsis:            Swagger 2.0 data model
 description:         Please see README.md
 homepage:            https://github.com/GetShopTV/swagger2