diff --git a/Makefile b/Makefile
index 5006316..384bad5 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ LINK_PCRE := 0
 
 ifeq ($(NIM_PARAMS),)
 # "variables.mk" was not included, so we update the submodules.
-GIT_SUBMODULE_UPDATE := nimble install https://github.com/elcritch/atlas && atlas rep --noexec atlas.lock
+GIT_SUBMODULE_UPDATE := nimble install https://github.com/nim-lang/atlas@\#2ab291c9f37e9d7acce906d1bb7fa49f57f10b22 && atlas rep --noexec atlas.lock
 .DEFAULT:
 	+@ echo -e "Git submodules not found. Running '$(GIT_SUBMODULE_UPDATE)'.\n"; \
 		$(GIT_SUBMODULE_UPDATE); \