diff --git a/requirements.txt b/requirements.txt
index 3dd4228ff..d26ec5c18 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,18 @@
-attrs==18.2.0
-PySide2==5.12.2
-pytest==4.3.0
-pytest-cov==2.6.1
-h5py==2.8.0
-flake8==3.5.0
-cx_Freeze==5.1.1
+# In general libraries should not be pinned to specific versions
+attrs
+pytest
+pytest-cov
+h5py
+flake8
 git+https://github.com/ess-dmsc/python-nexus-utilities@6f5d2c7f1ca66063227aad2a111a2cc567d573f6#egg=nexusutils
-jsonschema==2.6.0
-numpy-stl==2.7.0
+jsonschema
+numpy-stl
 pre-commit
 pint
+
+# cx_Freeze is used for packaging, the pypi version does not have a fix for Python 3.7 on Windows 10 (https://github.com/anthony-tuininga/cx_Freeze/issues/407)
+git+https://github.com/anthony-tuininga/cx_Freeze.git@master
+
+# PySide2 has had some issues with new versions and packaging so we will pin it
+PySide2==5.12.2
+