diff --git a/pkgs/development/python-modules/thinc/default.nix b/pkgs/development/python-modules/thinc/default.nix
index cdf2de9e730..acbc2a60817 100644
--- a/pkgs/development/python-modules/thinc/default.nix
+++ b/pkgs/development/python-modules/thinc/default.nix
@@ -19,18 +19,17 @@
 , plac
 , six
 , mock
-, termcolor
 , wrapt
 , dill
 }:
 
 buildPythonPackage rec {
   pname = "thinc";
-  version = "6.12.0";
+  version = "6.12.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0lfdf08v7rrj9b29z2vf8isaqa0zh16acw9im8chkqsh8bay4ykm";
+    sha256 = "1kkp8b3xcs3yn3ia5sxrh086c9xv27s2khdxd17abdypxxa99ich";
   };
 
   buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
@@ -45,20 +44,18 @@ buildPythonPackage rec {
    preshed
    numpy
    murmurhash
-   pytest
-   hypothesis
    tqdm
    cytoolz
    plac
    six
-   mock
-   termcolor
    wrapt
    dill
   ] ++ lib.optional (pythonOlder "3.4") pathlib;
 
 
   checkInputs = [
+    hypothesis
+    mock
     pytest
   ];
 
@@ -66,7 +63,7 @@ buildPythonPackage rec {
     substituteInPlace setup.py \
       --replace "pathlib==1.0.1" "pathlib>=1.0.0,<2.0.0" \
       --replace "plac>=0.9.6,<1.0.0" "plac>=0.9.6" \
-      --replace "wheel>=0.32.0,<0.33.0" "wheel>=0.31.0"
+      --replace "msgpack-numpy<0.4.4" "msgpack-numpy"
   '';
 
   # Cannot find cython modules.