diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5bd298936..9362e898b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.10.1 - TBD
+## 2.10.1 - 2017-08-22
 
 ### Added
 
@@ -22,7 +22,10 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#194](https://github.com/zendframework/zend-validator/pull/194) modifies the
+  `EmailAddress` validator to omit the `INTL_IDNA_VARIANT_UTS46` flag to
+  `idn_to_utf8()` if the constant is not defined, fixing an issue on systems
+  using pre-2012 releases of libicu.
 
 ## 2.10.0 - 2017-08-14
 
diff --git a/src/EmailAddress.php b/src/EmailAddress.php
index bd58018dc..ab5e9db9b 100644
--- a/src/EmailAddress.php
+++ b/src/EmailAddress.php
@@ -554,7 +554,10 @@ public function isValid($value)
     protected function idnToAscii($email)
     {
         if (extension_loaded('intl')) {
-            return (idn_to_ascii($email, 0, INTL_IDNA_VARIANT_UTS46) ?: $email);
+            if (defined('INTL_IDNA_VARIANT_UTS46')) {
+                return (idn_to_ascii($email, 0, INTL_IDNA_VARIANT_UTS46) ?: $email);
+            }
+            return (idn_to_ascii($email) ?: $email);
         }
         return $email;
     }
@@ -577,7 +580,10 @@ protected function idnToUtf8($email)
             // the source string in those cases.
             // But not when the source string is long enough.
             // Thus we default to source string ourselves.
-            return idn_to_utf8($email, 0, INTL_IDNA_VARIANT_UTS46) ?: $email;
+            if (defined('INTL_IDNA_VARIANT_UTS46')) {
+                return idn_to_utf8($email, 0, INTL_IDNA_VARIANT_UTS46) ?: $email;
+            }
+            return idn_to_utf8($email) ?: $email;
         }
         return $email;
     }
diff --git a/src/Hostname.php b/src/Hostname.php
index 1f995206d..f30c35f7b 100644
--- a/src/Hostname.php
+++ b/src/Hostname.php
@@ -69,7 +69,7 @@ class Hostname extends AbstractValidator
 
     /**
      * Array of valid top-level-domains
-     * IanaVersion 2017081400
+     * IanaVersion 2017082200
      *
      * @see ftp://data.iana.org/TLD/tlds-alpha-by-domain.txt  List of all TLDs by domain
      * @see http://www.iana.org/domains/root/db/ Official list of supported TLDs