diff --git a/pyproject.toml b/pyproject.toml
index b959d1fb1..a9d496c60 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ license = "Apache Software License v2.0"
 
 requires = [
     # direct requirements of gamma-facet
-    "gamma-pytools  >=1.1,<2",
+    "gamma-pytools  >=1.1.*,<2",
     "matplotlib     >=3.0,<3.4",
     "numpy          >=1.16,<1.21",
     "packaging      >=20",
@@ -96,7 +96,7 @@ joblib         = "=0.14.*"
 typing_inspect = "=0.4"
 
 [build.matrix.max]
-gamma-pytools  = ">=1.1,<2"
+gamma-pytools  = ">=1.1.*,<2"
 matplotlib     = "<3.4"
 numpy          = "<1.21"
 packaging      = ">=20"