diff --git a/test-requirements.txt b/test-requirements.txt
index 5779db814..5f78da3d8 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,5 +4,5 @@ sphinx>=1.5.0
 PyYAML>=3.1.0
 yamllint>=0.5.2
 requests-cache
-Pillow>=2.4.0,!=4.1.0  # PIL License
+Pillow>=2.4.0 # PIL License
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0