diff --git a/Gemfile.lock b/Gemfile.lock
index cd78ff9..6f76ace 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
       childprocess (>= 0.6.3, < 0.10.0)
       contracts (~> 0.9)
       cucumber (>= 1.3.19)
-      ffi (~> 1.9.10)
+      ffi (>= 1.9.24)
       rspec-expectations (>= 2.99)
       thor (~> 0.19)
     backports (3.11.3)
@@ -42,7 +42,7 @@ GEM
       thor (~> 0.18)
     byebug (10.0.2)
     childprocess (0.9.0)
-      ffi (~> 1.0, >= 1.0.11)
+      ffi (>= 1.9.24)
     coderay (1.1.2)
     concurrent-ruby (1.0.5)
     contracts (0.16.0)
@@ -72,7 +72,7 @@ GEM
     faraday_middleware (0.12.2)
       faraday (>= 0.7.4, < 1.0)
     fastercsv (1.5.5)
-    ffi (1.9.23)
+    ffi (>= 1.9.24)
     gherkin (5.0.0)
     gli (2.17.1)
     hashdiff (0.3.7)