diff --git a/pkgs/development/python-modules/spacy/default.nix b/pkgs/development/python-modules/spacy/default.nix
index dc0509e226c..0667565c0de 100644
--- a/pkgs/development/python-modules/spacy/default.nix
+++ b/pkgs/development/python-modules/spacy/default.nix
@@ -37,7 +37,8 @@ buildPythonPackage rec {
       --replace "ftfy==" "ftfy>=" \
       --replace "msgpack-python==" "msgpack-python>=" \
       --replace "msgpack-numpy==" "msgpack-numpy>=" \
-      --replace "pathlib" "pathlib; python_version<\"3.4\""
+      --replace "thinc>=6.10.3,<6.11.0" "thinc>=6.10.3" \
+      --replace "plac<1.0.0,>=0.9.6" "plac>=0.9.6"
   '';
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/thinc/default.nix b/pkgs/development/python-modules/thinc/default.nix
index 88e6c8d1674..321b1fb1181 100644
--- a/pkgs/development/python-modules/thinc/default.nix
+++ b/pkgs/development/python-modules/thinc/default.nix
@@ -35,7 +35,9 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace setup.py \
       --replace "msgpack-python==" "msgpack-python>=" \
-      --replace "msgpack-numpy==" "msgpack-numpy>="
+      --replace "msgpack-numpy==" "msgpack-numpy>=" \
+      --replace "plac>=0.9,<1.0" "plac>=0.9" \
+      --replace "hypothesis>=2,<3" "hypothesis>=2"
   '';
 
   propagatedBuildInputs = [