--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,13 @@
 # 'lxml' is not a primary requirement of afdko but it's listed here because
 # we want to have control over the version and guarantee that the XML output
 # of our tools is stable
-# NOTE: hard-pinning (==) here gets relaxed to >= in setup.py
-lxml==4.6.2
-booleanOperations==0.9.0
-defcon[pens,lxml]==0.7.2
-fontMath==0.6.0
-fontTools[woff,ufo,lxml,unicode]==4.21.1
-psautohint==2.3.0
-tqdm==4.58.0
-ufonormalizer==0.5.3
-ufoProcessor==1.9.0
+# NOTE: hard-pinning (>=) here gets relaxed to >= in setup.py
+lxml>=4.6.2
+booleanOperations>=0.9.0
+defcon[pens,lxml]>=0.7.2
+fontMath>=0.6.0
+fontTools[woff,ufo,lxml,unicode]>=4.21.1
+psautohint>=2.3.0
+tqdm>=4.58.0
+ufonormalizer>=0.5.3
+ufoProcessor>=1.9.0