diff --git a/docs/INTERNALS.md b/docs/INTERNALS.md
index 0cebad1c48..0737044a71 100644
--- a/docs/INTERNALS.md
+++ b/docs/INTERNALS.md
@@ -43,7 +43,7 @@ versions of libs and build tools.
  - GNU Autoconf 2.59
  - GNU Automake 1.7
  - GNU M4       1.4
- - perl         5.004
+ - perl         5.6
  - roffit       0.5
  - nroff        any version that supports `-man [in] [out]`
  - cmake        3.7
diff --git a/tests/runtests.pl b/tests/runtests.pl
index 31075523b3..79c7f40890 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -74,6 +74,7 @@ BEGIN {
     }
 }
 
+use 5.006;
 use strict;
 # Promote all warnings to fatal
 use warnings FATAL => 'all';