diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.1.2.0 (2021-10-18)
+
+- Add missing Eq and Show instances
+- Add support for change' fields: topic and hashtags
+
 ## 0.1.1.0 (2021-10-13)
 
 - Add EventCreatedOn Event attribute
diff --git a/gerrit.cabal b/gerrit.cabal
--- a/gerrit.cabal
+++ b/gerrit.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                gerrit
-version:             0.1.1.0
+version:             0.1.2.0
 synopsis:            A gerrit client library
 description:
     Gerrit is a client library to interface with https://www.gerritcodereview.com/
diff --git a/src/Gerrit/Data/Account.hs b/src/Gerrit/Data/Account.hs
--- a/src/Gerrit/Data/Account.hs
+++ b/src/Gerrit/Data/Account.hs
@@ -24,6 +24,7 @@
   | Username Text
   | IsActive
   | IsInactive
+  deriving (Eq, Show)
 
 userQueryText :: GerritAccountQuery -> Text
 userQueryText guq = case guq of
diff --git a/src/Gerrit/Data/Change.hs b/src/Gerrit/Data/Change.hs
--- a/src/Gerrit/Data/Change.hs
+++ b/src/Gerrit/Data/Change.hs
@@ -54,6 +54,7 @@
   | Project Text
   | ChangeId Text
   | After UTCTime
+  deriving (Eq, Show)
 
 -- | Convert a GerritQuery object to the search terms
 queryText :: GerritQuery -> Text
@@ -124,7 +125,7 @@
     gfSizeDelta :: Maybe Int,
     gfSize :: Maybe Int
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritFile where
   parseJSON = genericParseJSON $ aesonPrefix snakeCase
@@ -135,7 +136,7 @@
     cSubject :: Text,
     cMessage :: Text
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritCommit where
   parseJSON = genericParseJSON $ aesonPrefix snakeCase
@@ -147,7 +148,7 @@
     grCommit :: GerritCommit,
     grUploader :: GerritAuthor
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritRevision where
   parseJSON = genericParseJSON $ aesonPrefix snakeCase
@@ -156,7 +157,7 @@
   { value :: Maybe Int,
     account_id :: Int
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritDetailedLabelVote where
   parseJSON = genericParseJSON aesonOptions
@@ -165,7 +166,7 @@
   { all :: Maybe [GerritDetailedLabelVote],
     default_value :: Int
   }
-  deriving (Show, Generic, FromJSON)
+  deriving (Eq, Show, Generic, FromJSON)
 
 data GerritAuthor = GerritAuthor
   { aAccountId :: Int,
@@ -173,7 +174,7 @@
     aEmail :: Maybe Text,
     aUsername :: Maybe Text
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritAuthor where
   parseJSON = genericParseJSON aesonOptions
@@ -183,12 +184,13 @@
     caEmail :: Maybe Text,
     caDate :: GerritTime
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritCommitAuthor where
   parseJSON = genericParseJSON $ aesonPrefix snakeCase
 
-newtype GerritTime = GerritTime {unGerritTime :: UTCTime} deriving (Show)
+newtype GerritTime = GerritTime {unGerritTime :: UTCTime}
+  deriving (Eq, Show)
 
 instance FromJSON GerritTime where
   parseJSON = withText "UTCTimePlus" (parse . T.unpack)
@@ -203,7 +205,7 @@
     mDate :: GerritTime,
     mMessage :: Text
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritChangeMessage where
   parseJSON = genericParseJSON $ aesonPrefix snakeCase
@@ -212,6 +214,7 @@
   { id :: Text,
     project :: Text,
     branch :: Text,
+    hashtags :: [Text],
     subject :: Text,
     status :: GerritChangeStatus,
     mergeable :: Maybe Bool,
@@ -225,11 +228,12 @@
     updated :: GerritTime,
     submitted :: Maybe GerritTime,
     submitter :: Maybe GerritAuthor,
+    topic :: Maybe Text,
     insertions :: Int,
     deletions :: Int,
     more_changes :: Maybe Bool
   }
-  deriving (Show, Generic)
+  deriving (Eq, Show, Generic)
 
 instance FromJSON GerritChange where
   parseJSON = genericParseJSON aesonOptions
diff --git a/src/Gerrit/Data/Project.hs b/src/Gerrit/Data/Project.hs
--- a/src/Gerrit/Data/Project.hs
+++ b/src/Gerrit/Data/Project.hs
@@ -17,6 +17,7 @@
 import GHC.Generics (Generic)
 
 data GerritProjectQuery = Regexp Text | Prefix Text
+  deriving (Eq, Show)
 
 queryText :: GerritProjectQuery -> Text
 queryText (Regexp re) = "r=" <> re