diff --git a/.ruby-version b/.ruby-version
index 57cf282..ff365e0 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.6.5
+3.1.3
diff --git a/Gemfile.lock b/Gemfile.lock
index 71873b3..1a526bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,7 @@ GEM
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.4)
-    minitest (5.14.2)
+    minitest (5.17.0)
     msgpack (1.3.3)
     parallel (1.20.1)
     parser (3.0.1.0)
@@ -70,7 +70,7 @@ GEM
     simplecov (0.18.5)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
-    simplecov-html (0.12.2)
+    simplecov-html (0.12.3)
     thor (1.0.1)
     thread_safe (0.3.6)
     tzinfo (1.2.7)