diff --git a/package.yaml b/package.yaml
index a88af4891..98d6707aa 100644
--- a/package.yaml
+++ b/package.yaml
@@ -27,7 +27,7 @@ dependencies:
   - directory
   - warp
   - data-default
-  - aeson >=1.5
+  - aeson >=2
   - conduit
   - monad-logger
   - fast-logger
@@ -186,6 +186,7 @@ dependencies:
   - haskell-src-meta
   - either
   - xlsx
+  - hashable
 other-extensions:
   - GeneralizedNewtypeDeriving
   - IncoherentInstances
diff --git a/src/Network/HTTP/Types/Method/Instances.hs b/src/Network/HTTP/Types/Method/Instances.hs
index 38e2209c4..5907a3e36 100644
--- a/src/Network/HTTP/Types/Method/Instances.hs
+++ b/src/Network/HTTP/Types/Method/Instances.hs
@@ -18,7 +18,7 @@ import Utils.PathPiece (pathPieceJSON, pathPieceJSONKey)
 import Web.PathPieces
 
 
-deriving stock instance Generic StdMethod
+--deriving stock instance Generic StdMethod
 deriving anyclass instance Binary StdMethod
 deriving anyclass instance Hashable StdMethod
 
diff --git a/src/Utils/I18n.hs b/src/Utils/I18n.hs
index fcc9b288f..e1433b155 100644
--- a/src/Utils/I18n.hs
+++ b/src/Utils/I18n.hs
@@ -19,7 +19,8 @@ import ClassyPrelude.Yesod hiding (derivePersistFieldJSON)
 import Settings.Locale (appLanguages)
 
 import qualified Data.Aeson as JSON
-import qualified Data.HashMap.Lazy as HashMap
+import qualified Data.Aeson.KeyMap as KeyMap
+--import qualified Data.HashMap.Lazy as HashMap
 
 import qualified Data.Map as Map
 import qualified Data.Set as Set
@@ -89,13 +90,13 @@ instance ToJSON a => ToJSON (I18n a) where
         ]
     where
       fallbackUnambiguous = case toJSON i18nFallback of
-        JSON.Object hm  ->    not (HashMap.member "fallback" hm)
-                           && not (HashMap.member "fallback-lang" hm)
+        JSON.Object hm  ->    not (KeyMap.member "fallback" hm)
+                           && not (KeyMap.member "fallback-lang" hm)
         _other          -> True
 
 instance FromJSON a => FromJSON (I18n a) where
   parseJSON (JSON.Object o)
-    | HashMap.member "fallback" o || HashMap.member "fallback-lang" o = do
+    | KeyMap.member "fallback" o || KeyMap.member "fallback-lang" o = do
         i18nFallback <- o JSON..: "fallback"
         i18nFallbackLang <- o JSON..:? "fallback-lang"
         i18nTranslations <- o JSON..:? "translations" JSON..!= Map.empty
diff --git a/stack.yaml b/stack.yaml
index f0bdc4b54..b633c75c0 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -131,7 +131,8 @@ extra-deps:
   - bytestring-0.12.0.2@sha256:9fc077ff5b7ed2246773c3ac4370ef8822e4834d4587522b68ae551a5968fb86,7891
   - containers-0.7@sha256:e9b5fdcc609159410d408c47e0be13663bb0b4a42a5183b52aa0ac9c99e1dfec,2668
   - parsec-3.1.17.0@sha256:6cf18e59d9f1c5b40385457b82ab679dc18d3c5bd3c2c67b2f94e1e8732e6624,5119
-  - pretty-1.1.3.6@sha256:e16ffc733e816cfc09e99cc7f2398805f1f4c872d238a6b81668b5527284b382,2482
+#  - pretty-1.1.3.6@sha256:e16ffc733e816cfc09e99cc7f2398805f1f4c872d238a6b81668b5527284b382,2482
+  - pretty-1.1.3.6
   - process-1.6.18.0@sha256:69fbbca4151e1a6d1a5da41a1e17c254871675a4f2aed5213bbdfb10b5e52742,3148
   - time-1.12.2@sha256:88e8493d9130038d3b9968a2530a0900141cd3d938483c83dde56e12b875ebc8,6510
   - unix-2.8.5.0@sha256:633f15ef0bd50a16a7b5c5e86e6659fee6e4e211e098cc8bd0029f452bfcfddc,9808
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 03e32c136..98799ced6 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -588,7 +588,7 @@ packages:
       sha256: 9f62289797600d7121862309c306a3b495f872dccfe3d5c4bdeaf85d5ad12dd7
       size: 1308
   original:
-    hackage: pretty-1.1.3.6@sha256:e16ffc733e816cfc09e99cc7f2398805f1f4c872d238a6b81668b5527284b382,2482
+    hackage: pretty-1.1.3.6
 - completed:
     hackage: process-1.6.18.0@sha256:69fbbca4151e1a6d1a5da41a1e17c254871675a4f2aed5213bbdfb10b5e52742,3148
     pantry-tree: