diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,7 +1,7 @@
 # For more information, see: https://docs.haskellstack.org/en/stable/yaml_configuration/
 
 # Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)
-resolver: lts-15.13
+resolver: lts-9.21
 
 # Local packages, usually specified by relative directory name
 packages:
@@ -9,6 +9,9 @@
 
 # Packages to be pulled from upstream that are not in the resolver (e.g., acme-missiles-0.3)
 # extra-deps: []
+extra-deps:
+- ../haskell-tzdata
+# - tzdata-0.2.20201021.0
 
 # Override default flag values for local packages and extra-deps
 # flags: {}
diff --git a/tz.cabal b/tz.cabal
--- a/tz.cabal
+++ b/tz.cabal
@@ -1,5 +1,5 @@
 Name: tz
-Version: 0.1.3.4
+Version: 0.1.3.5
 License: Apache-2.0
 License-File: LICENSE
 Author: Mihaly Barasz, Gergely Risko
@@ -56,7 +56,7 @@
     data-default       >= 0.5      && < 0.8,
     deepseq            >= 1.1      && < 2,
     time               >= 1.2      && < 1.10,
-    tzdata             >= 0.1      && < 0.2,
+    tzdata             >= 0.1      && < 0.3,
     vector             >= 0.9      && < 0.13
   if flag(template-haskell)
     Exposed-Modules: