diff --git a/duckling.cabal b/duckling.cabal
index e8eeb0e7..20dce749 100644
--- a/duckling.cabal
+++ b/duckling.cabal
@@ -1224,7 +1224,7 @@ executable duckling-example-exe
                      , text
                      , text-show
                      , time
-                     , timezone-olson        >= 0.1.7 && < 0.3
+                     , timezone-olson        >= 0.2 && < 0.3
                      , timezone-series
                      , unordered-containers
   default-language:    Haskell2010
@@ -1259,7 +1259,7 @@ executable duckling-request-sample
                      , filepath              >= 1.4.0.0 && < 1.5
                      , text
                      , time
-                     , timezone-olson        >= 0.1.7 && < 0.3
+                     , timezone-olson        >= 0.2 && < 0.3
                      , timezone-series
                      , unordered-containers
   default-language:    Haskell2010
@@ -1278,7 +1278,7 @@ executable duckling-expensive
                      , filepath              >= 1.4.0.0 && < 1.5
                      , text
                      , time
-                     , timezone-olson        >= 0.1.7 && < 0.3
+                     , timezone-olson        >= 0.2 && < 0.3
                      , timezone-series
                      , unordered-containers
   default-language:    Haskell2010
diff --git a/stack.yaml b/stack.yaml
index 30fee675..cec00b32 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,10 +1,15 @@
-resolver: lts-14.20
+resolver: lts-16.31
 
 packages:
 - '.'
 
-extra-deps: []
+extra-deps:
+- regex-posix-clib-2.7
+- dependent-sum-0.7.1.0@sha256:0e419237f5b86da3659772afff9cab355c0f8d5b3fdb15a5b30e673d8dc83941,2147
+- constraints-extras-0.3.1.0@sha256:c70fcf437e1d640cfd50a8eda1db47a64e49c96857e08fd0d8c438327d908ac1,1846
 
-flags: {}
+flags:
+  regex-posix:
+    _regex-posix-clib: true
 
 extra-package-dbs: []