diff --git a/hledger-lib/Hledger/Data/Dates.hs b/hledger-lib/Hledger/Data/Dates.hs
index d63ec678f..f4af2e1ab 100644
--- a/hledger-lib/Hledger/Data/Dates.hs
+++ b/hledger-lib/Hledger/Data/Dates.hs
@@ -673,8 +673,8 @@ advancetonthweekday n wd s =
 -- -- | Parse a couple of date-time string formats to a time type.
 -- parsedatetimeM :: String -> Maybe LocalTime
 -- parsedatetimeM s = asum [
---     parseTime defaultTimeLocale "%Y/%m/%d %H:%M:%S" s,
---     parseTime defaultTimeLocale "%Y-%m-%d %H:%M:%S" s
+--     parseTimeM TruedefaultTimeLocale "%Y/%m/%d %H:%M:%S" s,
+--     parseTimeM TruedefaultTimeLocale "%Y-%m-%d %H:%M:%S" s
 --     ]
 
 -- | Try to parse a couple of date string formats:
diff --git a/hledger-lib/Hledger/Read/CsvReader.hs b/hledger-lib/Hledger/Read/CsvReader.hs
index 37a51f998..303167c99 100644
--- a/hledger-lib/Hledger/Read/CsvReader.hs
+++ b/hledger-lib/Hledger/Read/CsvReader.hs
@@ -1263,10 +1263,10 @@ parseDateWithCustomOrDefaultFormats mformat s = asum $ map parsewith formats
                ,"%Y-%-m-%-d"
                ,"%Y.%-m.%-d"
                -- ,"%-m/%-d/%Y"
-                -- ,parseTime defaultTimeLocale "%Y/%m/%e" (take 5 s ++ "0" ++ drop 5 s)
-                -- ,parseTime defaultTimeLocale "%Y-%m-%e" (take 5 s ++ "0" ++ drop 5 s)
-                -- ,parseTime defaultTimeLocale "%m/%e/%Y" ('0':s)
-                -- ,parseTime defaultTimeLocale "%m-%e-%Y" ('0':s)
+                -- ,parseTimeM TruedefaultTimeLocale "%Y/%m/%e" (take 5 s ++ "0" ++ drop 5 s)
+                -- ,parseTimeM TruedefaultTimeLocale "%Y-%m-%e" (take 5 s ++ "0" ++ drop 5 s)
+                -- ,parseTimeM TruedefaultTimeLocale "%m/%e/%Y" ('0':s)
+                -- ,parseTimeM TruedefaultTimeLocale "%m-%e-%Y" ('0':s)
                ]
                (:[])
                 mformat
diff --git a/hledger-web/Hledger/Web/Import.hs b/hledger-web/Hledger/Web/Import.hs
index e7ec60ef6..abc86e647 100644
--- a/hledger-web/Hledger/Web/Import.hs
+++ b/hledger-web/Hledger/Web/Import.hs
@@ -4,7 +4,7 @@ module Hledger.Web.Import
 
 import           Prelude              as Import hiding (head, init, last,
                                                  readFile, tail, writeFile)
-import           Yesod                as Import hiding (Route (..))
+import           Yesod                as Import hiding (Route (..), parseTime)
 
 import           Control.Monad        as Import
 import           Data.Bifunctor       as Import
@@ -15,7 +15,7 @@ import           Data.Foldable        as Import
 import           Data.List            as Import (unfoldr)
 import           Data.Maybe           as Import
 import           Data.Text            as Import (Text)
-import           Data.Time            as Import hiding (parseTime)
+import           Data.Time            as Import
 import           Data.Traversable     as Import
 import           Data.Void            as Import (Void)
 import           Text.Blaze           as Import (Markup)
diff --git a/stack.yaml b/stack.yaml
index 94d1b298a..844fc4896 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -6,22 +6,13 @@ packages:
 - hledger-lib
 - hledger
 - hledger-ui
-# - hledger-web
+- hledger-web
 
-# for hledger-web
-#allow-newer: true
-extra-deps:
+# extra-deps:
 # for hledger-lib:
 # for hledger:
 # for hledger-ui:
 # for hledger-web:
-# - yesod-1.6.2@sha256:4359fcb48a1e8a5cf862338de0fad56d9a50f038c8774137257bcb5276545ec0,2028
-# - yesod-static-1.6.1.0@sha256:0f075bcb8c90626ef738367333e3ac745fd7872619c6db388c0555f2ce768a5a,4419
-# - yesod-test-1.6.12@sha256:3a44e58051da38ba3cc2f29a3f2579a4a1c68c3077b5c5d2ad2f4f792d737184,2924
-# - yesod-core-1.6.21.0@sha256:d95ce6c0ff787a617fd0e1a6d4fc09ea57745ffca1e3795b01248ffcf596f83f,8124
-# - yesod-form-1.7.0@sha256:fd857fb9ea4f5af8500ec8613aa026e3a478c874b93da9d8ab8f17f329ec8c9e,3387
-# - yesod-persistent-1.6.0.7@sha256:7ece60b1a1e0c9f56ec2f1cf67dd9d0c3962ccabc878b975bef7f743709d267d,1732
-# - base64-0.4.2.3@sha256:97bd6f7decaab6110725ef1675a3ed8576233f6bab6599bb813f6caf68d36c94,2876  # doesn't build with 9.2 yet
 # for Shake.hs:
 
 nix: