diff --git a/requirements.txt b/requirements.txt
index 3521555..8a2d17b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-configobj
-quamash
+configobj==5.0.6
 indexed.py==0.0.1
-numpy==1.17.4
-PyQt5==5.13.2
-PyQt5-sip==12.7.0
+numpy==1.18.1
+PyQt5==5.13.0
+PyQt5-sip==4.19.18
+Quamash==0.6.1
 selectors2==2.0.1
-Quamash==0.6.1
\ No newline at end of file
+six==1.13.0