diff --git a/nix/build-all.py b/nix/build-all.py
index b97e003d24..811c1cb765 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -61,7 +61,7 @@ PROJECT_NAME="IfcOpenShell"
 OCE_VERSION="0.18"
 # OCCT_VERSION="7.1.0"
 # OCCT_HASH="89aebde"
-PYTHON_VERSIONS=["2.7.12", "3.2.6", "3.3.6", "3.4.6", "3.5.3", "3.6.2"]
+PYTHON_VERSIONS=["2.7.16", "3.2.6", "3.3.6", "3.4.6", "3.5.3", "3.6.2"]
 # OCCT_VERSION="7.2.0"
 # OCCT_HASH="88af392"
 OCCT_VERSION="7.3.0"