diff --git a/hardhat.config.ts b/hardhat.config.ts
index 254fec5c..7f567f0a 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -21,7 +21,7 @@ const compilers = {
       }
     },
     {
-      version: '0.8.17',
+      version: '0.6.6',
       settings: {
         optimizer: {
           enabled: true,
@@ -47,7 +47,7 @@ const compilers = {
       },
     },
     {
-      version: '0.8.13',
+      version: '0.8.17',
       settings: {
         optimizer: {
           enabled: true,
@@ -60,10 +60,10 @@ const compilers = {
       },
     },
     {
-      version: '0.6.6',
+      version: '0.8.20',
       settings: {
         optimizer: {
-          enabled: !process.env.CI,
+          enabled: true,
         },
         outputSelection: {
           '*': {
@@ -71,7 +71,7 @@ const compilers = {
           },
         },
       },
-    },
+    }
   ],
 }