diff --git a/Criterion/Report.hs b/Criterion/Report.hs
--- a/Criterion/Report.hs
+++ b/Criterion/Report.hs
@@ -70,6 +70,10 @@
 import qualified Language.Javascript.Chart as Chart
 #endif
 
+#if MIN_VERSION_aeson(2,0,0)
+import qualified Data.Aeson.Key as Key
+#endif
+
 -- | Trim long flat tails from a KDE plot.
 tidyTails :: KDE -> KDE
 tidyTails KDE{..} = KDE { kdeType   = kdeType
@@ -214,8 +218,9 @@
        -> Value
 {-# SPECIALIZE vector :: T.Text -> U.Vector Double -> Value #-}
 vector name v = toJSON . map val . G.toList $ v where
-    val i = object [ name .= i ]
+    val i = object [ toKey name .= i ]
 
+
 -- | Render the elements of two vectors.
 vector2 :: (G.Vector v a, G.Vector v b, ToJSON a, ToJSON b) =>
            T.Text               -- ^ Name for elements from the first vector.
@@ -227,9 +232,18 @@
                        -> Value #-}
 vector2 name1 name2 v1 v2 = toJSON $ zipWith val (G.toList v1) (G.toList v2) where
     val i j = object
-        [ name1 .= i
-        , name2 .= j
+        [ toKey name1 .= i
+        , toKey name2 .= j
         ]
+
+#if MIN_VERSION_aeson(2,0,0)
+toKey :: T.Text -> Key.Key
+toKey = Key.fromText
+#else
+toKey :: T.Text -> T.Text
+toKey = id
+#endif
+
 
 -- | Attempt to include the contents of a file based on a search path.
 -- Returns 'B.empty' if the search fails or the file could not be read.
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+1.5.11.0
+
+* Allow building with `aeson-2.0.0.0`.
+
 1.5.10.0
 
 * Fix a bug in which the `defaultMainWith` function would not use the
diff --git a/criterion.cabal b/criterion.cabal
--- a/criterion.cabal
+++ b/criterion.cabal
@@ -1,5 +1,5 @@
 name:           criterion
-version:        1.5.10.0
+version:        1.5.11.0
 synopsis:       Robust, reliable performance measurement and analysis
 license:        BSD3
 license-file:   LICENSE
@@ -80,10 +80,12 @@
     Paths_criterion
 
   build-depends:
-    aeson >= 1,
+    -- TODO: Eventually, we should bump the lower version bounds to >=2 so that
+    -- we can remove some CPP in Criterion.Report. See #247.
+    aeson >= 1 && < 2.1,
     ansi-wl-pprint >= 0.6.7.2,
     base >= 4.5 && < 5,
-    base-compat-batteries >= 0.10 && < 0.12,
+    base-compat-batteries >= 0.10 && < 0.13,
     binary >= 0.5.1.0,
     binary-orphans >= 1.0.1 && < 1.1,
     bytestring >= 0.9 && < 1.0,
@@ -195,7 +197,7 @@
     tasty-hunit,
     tasty-quickcheck,
     vector,
-    aeson >= 0.8
+    aeson
 
 test-suite cleanup
   type:                 exitcode-stdio-1.0