diff --git a/nipype/info.py b/nipype/info.py
index a550e4b389..89ff729afa 100644
--- a/nipype/info.py
+++ b/nipype/info.py
@@ -149,6 +149,7 @@ def get_nipype_gitversion():
     "filelock>=3.0.0",
     "etelemetry>=0.2.0",
     "looseversion!=1.2",
+    "puremagic",
 ]
 
 TESTS_REQUIRES = [
diff --git a/nipype/interfaces/dcmstack.py b/nipype/interfaces/dcmstack.py
index b76255ab84..7ed773626c 100644
--- a/nipype/interfaces/dcmstack.py
+++ b/nipype/interfaces/dcmstack.py
@@ -7,7 +7,7 @@
 from glob import glob
 
 import nibabel as nb
-import imghdr
+import puremagic
 
 from .base import (
     TraitedSpec,
@@ -152,7 +152,7 @@ def _run_interface(self, runtime):
         meta_filter = dcmstack.make_key_regex_filter(exclude_regexes, include_regexes)
         stack = dcmstack.DicomStack(meta_filter=meta_filter)
         for src_path in src_paths:
-            if not imghdr.what(src_path) == "gif":
+            if not puremagic.what(src_path) == "gif":
                 src_dcm = pydicom.dcmread(src_path, force=self.inputs.force_read)
                 stack.add_dcm(src_dcm)
         nii = stack.to_nifti(embed_meta=True)