diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+0.9.1.2
+-------
+* Increase aeson upper bound to <0.11
+
 0.9.1.1
 -------
 * Fix stackage integration.
diff --git a/eventstore.cabal b/eventstore.cabal
--- a/eventstore.cabal
+++ b/eventstore.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.9.1.1
+version:             0.9.1.2
 
 tested-with: GHC >= 7.8.3 && < 7.11
 
@@ -100,7 +100,7 @@
 
   -- Other library packages from which modules are imported.
   build-depends:       base       >=4.7      && <5
-                     , aeson      >=0.8      && <0.10
+                     , aeson      >=0.8      && <0.11
                      , async      >=2.0      && <2.1
                      , bytestring >=0.10.4   && <0.11
                      , cereal     >=0.4      && <0.5
diff --git a/tests/Tests.hs b/tests/Tests.hs
--- a/tests/Tests.hs
+++ b/tests/Tests.hs
@@ -52,7 +52,7 @@
 --------------------------------------------------------------------------------
 writeEventTest :: Connection -> IO ()
 writeEventTest conn = do
-    let js  = [ "baz" .= True ]
+    let js  = object [ "baz" .= True ]
         evt = createEvent "foo" Nothing $ withJson js
 
     as <- sendEvent conn "write-event-test" anyVersion evt
@@ -62,7 +62,7 @@
 --------------------------------------------------------------------------------
 readEventTest :: Connection -> IO ()
 readEventTest conn = do
-    let js  = [ "baz" .= True ]
+    let js  = object [ "baz" .= True ]
         evt = createEvent "foo" Nothing $ withJson js
     as <- sendEvent conn "read-event-test" anyVersion evt
     _  <- wait as
@@ -82,7 +82,7 @@
 --------------------------------------------------------------------------------
 deleteStreamTest :: Connection -> IO ()
 deleteStreamTest conn = do
-    let js  = [ "baz" .= True ]
+    let js  = object [ "baz" .= True ]
         evt = createEvent "foo" Nothing $ withJson js
     _ <- sendEvent conn "delete-stream-test" anyVersion evt >>= wait
     _ <- deleteStream conn "delete-stream-test" anyVersion Nothing
@@ -91,7 +91,7 @@
 --------------------------------------------------------------------------------
 transactionTest :: Connection -> IO ()
 transactionTest conn = do
-    let js  = [ "baz" .= True ]
+    let js  = object [ "baz" .= True ]
         evt = createEvent "foo" Nothing $ withJson js
     t  <- startTransaction conn "transaction-test" anyVersion >>= wait
     _  <- transactionWrite t [evt] >>= wait
@@ -116,9 +116,9 @@
 --------------------------------------------------------------------------------
 readStreamEventForwardTest :: Connection -> IO ()
 readStreamEventForwardTest conn = do
-    let jss = [ [ "baz" .= True]
-              , [ "foo" .= False]
-              , [ "bar" .= True]
+    let jss = [ object [ "baz" .= True]
+              , object [ "foo" .= False]
+              , object [ "bar" .= True]
               ]
         evts = fmap (createEvent "foo" Nothing . withJson) jss
     _  <- sendEvents conn "read-forward-test" anyVersion evts >>= wait
@@ -133,9 +133,9 @@
 --------------------------------------------------------------------------------
 readStreamEventBackwardTest :: Connection -> IO ()
 readStreamEventBackwardTest conn = do
-    let jss = [ [ "baz" .= True]
-              , [ "foo" .= False]
-              , [ "bar" .= True]
+    let jss = [ object [ "baz" .= True]
+              , object [ "foo" .= False]
+              , object [ "bar" .= True]
               ]
         evts = fmap (createEvent "foo" Nothing . withJson) jss
     _  <- sendEvents conn "read-backward-test" anyVersion evts >>= wait
@@ -162,9 +162,9 @@
 --------------------------------------------------------------------------------
 subscribeTest :: Connection -> IO ()
 subscribeTest conn = do
-    let jss = [ [ "baz" .= True]
-              , [ "foo" .= False]
-              , [ "bar" .= True]
+    let jss = [ object [ "baz" .= True]
+              , object [ "foo" .= False]
+              , object [ "bar" .= True]
               ]
         evts = fmap (createEvent "foo" Nothing . withJson) jss
     sub  <- subscribe conn "subscribe-test" False
@@ -186,13 +186,13 @@
 --------------------------------------------------------------------------------
 subscribeFromTest :: Connection -> IO ()
 subscribeFromTest conn = do
-    let jss = [ [ "1" .= (1 :: Int)]
-              , [ "2" .= (2 :: Int)]
-              , [ "3" .= (3 :: Int)]
+    let jss = [ object [ "1" .= (1 :: Int)]
+              , object [ "2" .= (2 :: Int)]
+              , object [ "3" .= (3 :: Int)]
               ]
-        jss2 = [ [ "4" .= (4 :: Int)]
-               , [ "5" .= (5 :: Int)]
-               , [ "6" .= (6 :: Int)]
+        jss2 = [ object [ "4" .= (4 :: Int)]
+               , object [ "5" .= (5 :: Int)]
+               , object [ "6" .= (6 :: Int)]
                ]
         alljss = jss ++ jss2
         evts   = fmap (createEvent "foo" Nothing . withJson) jss
@@ -274,8 +274,8 @@
 connectToPersistentTest :: Connection -> IO ()
 connectToPersistentTest conn = do
     let def = defaultPersistentSubscriptionSettings
-        js1 = "baz" .= True
-        js2 = "foo" .= True
+        js1 = object ["baz" .= True]
+        js2 = object ["foo" .= True]
         jss  = [ js1
                , js2
                ]
@@ -307,7 +307,7 @@
 --------------------------------------------------------------------------------
 shutdownTest :: Connection -> IO ()
 shutdownTest conn = do
-    let js     = "baz" .= True
+    let js     = object ["baz" .= True]
         evt    = createEvent "foo" Nothing $ withJson js
         action = do
             _ <- sendEvent conn "shutdown-test" anyVersion evt