diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # ChangeLog for shakespeare
 
+### 2.1.0.1
+
+* Fix 100⨯ slowdown on parsec-3.1.15 [#277](https://github.com/yesodweb/shakespeare/pull/277)
+
 ### 2.1.0
 
 * Add `OverloadedRecordDot`-style record access in expressions
diff --git a/Text/Hamlet/Parse.hs b/Text/Hamlet/Parse.hs
--- a/Text/Hamlet/Parse.hs
+++ b/Text/Hamlet/Parse.hs
@@ -79,7 +79,7 @@
 
 parseLines :: HamletSettings -> String -> Result (Maybe NewlineStyle, HamletSettings, [(Int, Line)])
 parseLines set s =
-    case parse parser s s of
+    case parse parser "[Hamlet input]" s of
         Left e -> Error $ show e
         Right x -> Ok x
   where
diff --git a/shakespeare.cabal b/shakespeare.cabal
--- a/shakespeare.cabal
+++ b/shakespeare.cabal
@@ -1,5 +1,5 @@
 name:            shakespeare
-version:         2.1.0
+version:         2.1.0.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -35,7 +35,7 @@
 
 library
     default-language: Haskell2010
-    build-depends:   base             >= 4.12    && < 5
+    build-depends:   base             >= 4.11    && < 5
                    , time             >= 1
                    , containers
                    , template-haskell >= 2.7