diff --git a/.gitmodules b/.gitmodules
index 03507b25..20898374 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -42,7 +42,7 @@
 	url = https://github.com/ucb-bar/esp-tools.git
 [submodule "vlsi/hammer"]
 	path = vlsi/hammer
-	url = git@github.com:ucb-bar/hammer.git
+	url = https://github.com/ucb-bar/hammer.git
 [submodule "vlsi/hammer-cad-plugins"]
 	path = vlsi/hammer-cad-plugins
-	url = git@github.com:ucb-bar/hammer-cad-plugins
+	url = https://github.com/ucb-bar/hammer-cad-plugins