diff --git a/tools/requirements.txt b/tools/requirements.txt
index 1898d644..a8b72f6c 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -1,5 +1,5 @@
-crossref_commons==0.0.7
-numpy==1.20.1
-GitPython==3.1.14
-PyYAML==5.4.1
-TexSoup==0.3.1
+crossref_commons>=0.0.7
+numpy>=1.20.1
+GitPython>=3.1.14
+PyYAML>=5.4.1
+TexSoup>=0.3.1