diff --git a/espial.cabal b/espial.cabal
index 4970b7f..b263b11 100644
--- a/espial.cabal
+++ b/espial.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.34.4.
+-- This file has been generated from package.yaml by hpack version 0.35.0.
 --
 -- see: https://github.com/sol/hpack
 
@@ -165,7 +165,7 @@ library
     , base64
     , bcrypt >=0.0.8
     , blaze-html >=0.9 && <1.0
-    , bytestring >=0.9 && <0.11
+    , bytestring >=0.9 && <0.14
     , case-insensitive
     , classy-prelude >=1.4 && <1.6
     , classy-prelude-conduit >=1.4 && <1.6
@@ -217,12 +217,12 @@ library
     , yesod-form >=1.6 && <1.8
     , yesod-newsfeed >=1.6 && <1.8
     , yesod-static >=1.6 && <1.8
+  default-language: Haskell2010
   if (flag(dev)) || (flag(library-only))
     ghc-options: -Wall -fwarn-tabs -O0
     cpp-options: -DDEVELOPMENT
   else
     ghc-options: -Wall -fwarn-tabs -O2
-  default-language: Haskell2010
 
 executable espial
   main-is: main.hs
@@ -277,7 +277,7 @@ executable espial
     , base64
     , bcrypt >=0.0.8
     , blaze-html >=0.9 && <1.0
-    , bytestring >=0.9 && <0.11
+    , bytestring >=0.9 && <0.14
     , case-insensitive
     , classy-prelude >=1.4 && <1.6
     , classy-prelude-conduit >=1.4 && <1.6
@@ -330,9 +330,9 @@ executable espial
     , yesod-form >=1.6 && <1.8
     , yesod-newsfeed >=1.6 && <1.8
     , yesod-static >=1.6 && <1.8
+  default-language: Haskell2010
   if flag(library-only)
     buildable: False
-  default-language: Haskell2010
 
 executable migration
   main-is: Main.hs
@@ -386,7 +386,7 @@ executable migration
     , base64
     , bcrypt >=0.0.8
     , blaze-html >=0.9 && <1.0
-    , bytestring >=0.9 && <0.11
+    , bytestring >=0.9 && <0.14
     , case-insensitive
     , classy-prelude >=1.4 && <1.6
     , classy-prelude-conduit >=1.4 && <1.6
@@ -441,9 +441,9 @@ executable migration
     , yesod-form >=1.6 && <1.8
     , yesod-newsfeed >=1.6 && <1.8
     , yesod-static >=1.6 && <1.8
+  default-language: Haskell2010
   if flag(library-only)
     buildable: False
-  default-language: Haskell2010
 
 test-suite test
   type: exitcode-stdio-1.0
@@ -501,7 +501,7 @@ test-suite test
     , base64
     , bcrypt >=0.0.8
     , blaze-html >=0.9 && <1.0
-    , bytestring >=0.9 && <0.11
+    , bytestring >=0.9 && <0.14
     , case-insensitive
     , classy-prelude >=1.4 && <1.6
     , classy-prelude-conduit >=1.4 && <1.6
diff --git a/package.yaml b/package.yaml
index 4e783ee..77eabd9 100644
--- a/package.yaml
+++ b/package.yaml
@@ -94,7 +94,7 @@ dependencies:
 - classy-prelude >=1.4 && <1.6
 - classy-prelude-conduit >=1.4 && <1.6
 - classy-prelude-yesod >=1.4 && <1.6
-- bytestring >=0.9 && <0.11
+- bytestring >=0.9 && <0.14
 - text >=0.11 && <2.0
 - persistent >=2.8 && <2.14
 - blaze-html >= 0.9 && < 1.0
diff --git a/stack.yaml b/stack.yaml
index 4b9aaae..3020413 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,3 @@
-resolver: lts-19.30
+resolver: lts-20.1
 packages:
 - .
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 39b0138..e067f78 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 619200
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/30.yaml
-    sha256: 9a74d76d250a455d9cd11e74f157e087787fa9aa3c4264e69c94703d1e71aede
-  original: lts-19.30
+    sha256: b73b2b116143aea728c70e65c3239188998bac5bc3be56465813dacd74215dc5
+    size: 648424
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/1.yaml
+  original: lts-20.1