diff --git a/changes.txt b/changes.txt
--- a/changes.txt
+++ b/changes.txt
@@ -1,3 +1,10 @@
+1.0.9.1
+-------
+
+- Released Tue 12 Dec 2017 14:33:01 CET
+- Released constraints and updated stack.yaml (Luke Murphy)
+- Minor typos fix
+
 1.0.9.0
 -------
 
diff --git a/lentil.cabal b/lentil.cabal
--- a/lentil.cabal
+++ b/lentil.cabal
@@ -1,5 +1,5 @@
 name:                lentil
-version:             1.0.9.0
+version:             1.0.9.1
 synopsis:            frugal issue tracker
 description:         minumum effort, cohesive issue tracker based on
                      ubiquitous @TODO@s and @FIXME@s conventions.
@@ -13,7 +13,7 @@
 category:            Development
 stability:           Stable
 build-type:          Simple
-tested-with:         GHC==7.8.4, GHC==8.0.1
+tested-with:         GHC==7.8.4, GHC==8.0.1, GHC==8.2.2
 extra-source-files:  stack.yaml,
                      test/test-files/lang-comm/clang.c,
                      test/test-files/lang-comm/haskell.hs,
@@ -60,7 +60,8 @@
                        directory    >= 1.2 && < 1.4,
                        transformers >= 0.3 && < 0.6,
                        pipes        >= 4.2 && < 4.4,
-                       optparse-applicative==0.13.*, regex-tdfa==1.2.*,
+                       optparse-applicative >= 0.13 && < 0.15,
+                       regex-tdfa==1.2.*,
                        natural-sort==0.1.*, parsec==3.1.*, filepath==1.4.*,
                        filemanip==0.3.*, ansi-wl-pprint==0.6.*, csv==0.1.*,
                        terminal-progress-bar==0.1.*,
@@ -88,7 +89,8 @@
                        directory    >= 1.2 && < 1.4,
                        transformers >= 0.3 && < 0.6,
                        pipes        >= 4.2 && < 4.4,
-                       optparse-applicative==0.13.*, regex-tdfa==1.2.*,
+                       optparse-applicative >= 0.13 && < 0.15,
+                       regex-tdfa==1.2.*,
                        natural-sort==0.1.*, parsec==3.1.*, filepath==1.4.*,
                        filemanip==0.3.*, ansi-wl-pprint==0.6.*, csv==0.1.*,
                        terminal-progress-bar==0.1.*, text==1.2.*,
@@ -98,7 +100,7 @@
   other-modules:       Lentil.Types, Lentil.Args, Lentil.File, Lentil.Print,
                        Lentil.Query, Lentil.Export, Lentil.Parse.Source,
                        Lentil.Parse.Issue, Lentil.Parse.Syntaxes,
-                       Lentil.Parse.Run,
+                       Lentil.Parse.Run, Lentil.HelpersSpec
                        Lentil.ArgsSpec, Lentil.ExportSpec, Lentil.FileSpec,
                        Lentil.PrintSpec, Lentil.Parse.SourceSpec,
                        Lentil.Parse.IssueSpec, Lentil.QuerySpec,
diff --git a/src/Lentil/Helpers.hs b/src/Lentil/Helpers.hs
--- a/src/Lentil/Helpers.hs
+++ b/src/Lentil/Helpers.hs
@@ -45,4 +45,3 @@
               P.many P.anyChar                         >>= \b ->
               return ('.':a, '.':b)
 
-
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -29,7 +29,7 @@
                                    short 'v'      <>
                                    help "show version and copyright info" )
     where
-          versionCopy = "\nlentil - frugal issue tracker, version 1.0.9.0\n\
+          versionCopy = "\nlentil - frugal issue tracker, version 1.0.9.1\n\
                         \(C) 2015-2017 Francesco Ariis - http://www.ariis.it\n\
                         \released under the GNU General Public License v3\n"
 
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,3 @@
-resolver: lts-8.3
+resolver: lts-9.14
 packages:
 - '.'
diff --git a/test/Lentil/HelpersSpec.hs b/test/Lentil/HelpersSpec.hs
new file mode 100644
--- /dev/null
+++ b/test/Lentil/HelpersSpec.hs
@@ -0,0 +1,45 @@
+module Lentil.HelpersSpec where
+
+
+import Test.Hspec
+import Text.Parsec
+import Text.Parsec.String
+
+import Lentil.Helpers
+
+import Prelude -- 7.8 hack
+
+-- Parsing tests
+
+-- simple parser (choosable if we are at begin of line or else)
+sp :: Parser a -> String -> Maybe a
+sp p cs = either (const Nothing) Just
+                    (runParser p () fp cs)
+    where fp = "<f>"
+
+
+main :: IO ()
+main = hspec spec
+
+
+spec :: Spec
+spec = do
+
+  describe "manyTill1" $ do
+    it "behaves like manyTill on non-empty string" $
+      sp (manyTill1 anyChar newline) "foo\n" `shouldBe`
+      sp (manyTill anyChar newline) "foo\n"
+    it "fails on empty string (while manyTill does not)" $
+      (sp (manyTill1 anyChar newline) "\n",
+       sp (manyTill  anyChar newline) "\n") `shouldBe` (Nothing,
+                                                        Just "")
+    it "has the same behaviour as manyTill on 1 char w/o end char" $
+      sp (manyTill1 anyChar newline) "f" `shouldBe`
+      sp (manyTill anyChar newline) "f"
+
+  describe "aliasp" $ do
+    it "parses an extension alias" $
+      aliasp "aaa%bc" `shouldBe` Just (".aaa", ".bc")
+    it "fails on incorrect input" $
+      aliasp "aaabc" `shouldBe` Nothing
+