diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51ae3e0..3e02608 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -90,7 +90,7 @@ set(GRC_BLOCKS_DIR      ${GR_PKG_DATA_DIR}/grc/blocks)
 # Find gnuradio build dependencies
 ########################################################################
 set(GR_REQUIRED_COMPONENTS RUNTIME PMT)
-find_package(Gnuradio)
+find_package(Gnuradio 3.7.6 REQUIRED)
 find_package(CppUnit)
 
 # To run a more advanced search for GNU Radio and it's components and
diff --git a/README.txt b/README.txt
index e9f1fb2..747f7ab 100644
--- a/README.txt
+++ b/README.txt
@@ -74,7 +74,7 @@ I used this block for automated performance tests with no-GUI flow graphs.
 
 ### Dependencies
 
-GNU Radio v3.7
+GNU Radio v3.7.6
 
 
 ### Installation