Fix pip upgrade on windows machines #5648 (#5649)

greshilov · web-flow · commit 4c663a2c887d · 2021-04-26T13:10:32.000+02:00
diff --git a/CHANGES/5648.misc b/CHANGES/5648.misc
@@ -0,0 +1 @@
+Fix pip upgrade on windows machines
diff --git a/Makefile b/Makefile
@@ -49,7 +49,7 @@ endif
 .SECONDARY: $(call to-hash,$(ALLS))
 
 .update-pip:
-	@pip install -U 'pip'
+	@python -m pip install --upgrade pip
 
 .install-cython: .update-pip $(call to-hash,requirements/cython.txt)
 	@pip install -r requirements/cython.txt
