diff --git a/requirements.txt b/requirements.txt
index a35583e56da774621c9fee8dfcc693f2ffacd962..83de75e266e952ae485cb15e388b0863a408a996 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 six>=1.10.0,<2.0
 numpy>=1.11.1,<2.0
 nibabel>=2.1,<3.0
-indexed_gzip>=0.3.2,<0.4
+indexed_gzip>=0.3.3,<0.4
 wxPython>=3.0.2.0,<=4.0