diff --git a/Gemfile.lock b/Gemfile.lock
index 3a45895..7bf097d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -146,8 +146,7 @@ GEM
       railties (>= 3.0.0, < 5.0.0)
     method_source (0.8.2)
     mime-types (1.23)
-    mini_magick (3.5.0)
-      subexec (~> 0.2.1)
+    mini_magick (4.9.5)
     minitest (4.7.3)
     minitest-reporters (0.14.16)
       ansi
@@ -291,7 +290,6 @@ GEM
       actionpack (~> 3.0)
       activemodel (~> 3.0)
       railties (~> 3.0)
-    subexec (0.2.3)
     temple (0.6.4)
     texticle (2.2.0)
       activerecord (>= 3.0, < 4.1)