diff --git a/CMakeLists.txt b/CMakeLists.txt
index a42d888..927c0c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,8 +23,8 @@ option(STRATEGY_GetDependencies "Fetch external dependencies from web." ON)
 
 if (STRATEGY_GetDependencies)
     ExternalProject_add(ptrie-ext
-        URL https://github.com/petergjoel/ptrie/archive/v1.1.0.zip
-        URL_HASH SHA512=092a8f50ca21d1199b19a10c4e0273c93a717a9f6491998a16bf21d21d37e6537ffd8a06ac41a2b623241da6036546d44b754567441944565e2a16646378cf29
+        URL https://github.com/petergjoel/ptrie/archive/v1.1.1.zip
+        URL_HASH SHA512=5435D6F8132D273B50ECCD721790D559F7DC67FFDADA75FEC315F4C53705199F31F1DDC80DDA0CB86F883DB27076FA6D324D28516B442FECCE3FFA51213AEF4E
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION} -DBUILD_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
     )