diff --git a/packages/python/3.9.4/build.sh b/packages/python/3.9.4/build.sh
index 1966bd9..737faf9 100755
--- a/packages/python/3.9.4/build.sh
+++ b/packages/python/3.9.4/build.sh
@@ -16,6 +16,6 @@ make install -j$(nproc)
 
 cd ..
 
-rm -rf build 
+rm -rf build
 
-bin/pip3 install numpy scipy pandas pycrypto whoosh bcrypt passlib sympy
+bin/pip3 install numpy scipy pandas pycrypto whoosh bcrypt passlib sympy regex
\ No newline at end of file