diff --git a/Makefile b/Makefile
index bf1eeb33..bd2f5260 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,3 @@
-build  :; dapp --use solc:0.6.11 build
+build  :; dapp --use solc:0.5.12 build
 clean  :; dapp clean
-test   :; dapp --use solc:0.6.11 test -v ${TEST_FLAGS}
+test   :; dapp --use solc:0.5.12 test -v ${TEST_FLAGS}