diff --git a/hledger-lib/future-package.yaml b/hledger-lib/future-package.yaml
index 4fe973e88..2196d68c2 100644
--- a/hledger-lib/future-package.yaml
+++ b/hledger-lib/future-package.yaml
@@ -82,7 +82,7 @@ dependencies:
   - safe >= 0.2
   - split >= 0.1 && < 0.3
   - text >= 1.2 && < 1.3
-  - transformers >= 0.2 && < 0.6
+  - transformers >= 0.2 && < 0.7
   - uglymemo
   - utf8-string >= 0.3.5 && < 1.1
   - HUnit
diff --git a/hledger-lib/hledger-lib.cabal b/hledger-lib/hledger-lib.cabal
index a99601121..aa25b05e7 100644
--- a/hledger-lib/hledger-lib.cabal
+++ b/hledger-lib/hledger-lib.cabal
@@ -83,7 +83,7 @@ library
     , safe >= 0.2
     , split >= 0.1 && < 0.3
     , text >= 1.2 && < 1.3
-    , transformers >= 0.2 && < 0.6
+    , transformers >= 0.2 && < 0.7
     , uglymemo
     , utf8-string >= 0.3.5 && < 1.1
     , HUnit
@@ -164,7 +164,7 @@ test-suite hunittests
     , safe >= 0.2
     , split >= 0.1 && < 0.3
     , text >= 1.2 && < 1.3
-    , transformers >= 0.2 && < 0.6
+    , transformers >= 0.2 && < 0.7
     , uglymemo
     , utf8-string >= 0.3.5 && < 1.1
     , HUnit