diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22ad70e01..22b0eb57a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -354,7 +354,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
           message(STATUS "Your GCC version is too old and does not support some C++ features required by GNSS-SDR. GCC version must be at least ${GNSSSDR_GCC_MIN_VERSION}")
           if(${LINUX_DISTRIBUTION} MATCHES "Ubuntu")
               if(${LINUX_VER} MATCHES "12.04")
-                  message(STATUS "For instructions on how to upgrade GCC, check http://askubuntu.com/a/271561")
+                  message(STATUS "For instructions on how to upgrade GCC, check https://askubuntu.com/a/271561")
               endif(${LINUX_VER} MATCHES "12.04")
           endif(${LINUX_DISTRIBUTION} MATCHES "Ubuntu")
           message(FATAL_ERROR "Fatal error: GCC >= ${GNSSSDR_GCC_MIN_VERSION} required.")
@@ -466,7 +466,7 @@ endif(ENABLE_UNIT_TESTING OR ENABLE_SYSTEM_TESTING)
 
 
 ################################################################################
-# Boost - http://www.boost.org
+# Boost - https://www.boost.org
 ################################################################################
 if(UNIX AND EXISTS "/usr/lib64")
     list(APPEND BOOST_LIBRARYDIR "/usr/lib64") # Fedora 64-bit fix
@@ -490,7 +490,7 @@ endif(NOT Boost_FOUND)
 
 
 ################################################################################
-# GNU Radio - http://gnuradio.org
+# GNU Radio - https://gnuradio.org
 ################################################################################
 set(GR_REQUIRED_COMPONENTS RUNTIME ANALOG BLOCKS FFT FILTER PMT)
 find_package(Gnuradio)
@@ -1032,7 +1032,7 @@ endif(NOT ARMADILLO_FOUND OR ENABLE_OWN_ARMADILLO)
 
 
 ################################################################################
-# GnuTLS - http://www.gnutls.org/
+# GnuTLS - https://www.gnutls.org/
 ################################################################################
 find_package(GnuTLS)
 find_library(GNUTLS_OPENSSL_LIBRARY NAMES gnutls-openssl libgnutls-openssl.so.27
@@ -1203,7 +1203,7 @@ if(ENABLE_UHD)
         set(ENABLE_UHD OFF)
         message(STATUS " The USRP Hardware Driver (UHD) signal source will not be built,")
         message(STATUS " so all USRP-based front-ends will not be usable.")
-        message(STATUS " Please check http://files.ettus.com/manual/")
+        message(STATUS " Please check https://files.ettus.com/manual/")
     else(NOT UHD_FOUND)
         set(GR_REQUIRED_COMPONENTS UHD)
         find_package(Gnuradio)
@@ -1430,7 +1430,7 @@ if(ENABLE_GPERFTOOLS)
 endif(ENABLE_GPERFTOOLS)
 if(ENABLE_GPERFTOOLS)
     # Set GPerftools related flags if it is available
-    # See http://gperftools.googlecode.com/svn/trunk/README
+    # See https://github.com/gperftools/gperftools/blob/master/README
     if(GPERFTOOLS_FOUND)
         if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
             set(MY_CXX_FLAGS "${MY_CXX_FLAGS} -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free")
@@ -1472,7 +1472,7 @@ if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
             # set(MY_CXX_FLAGS "${MY_CXX_FLAGS} -std=c++17")
         # endif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0")
     endif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6.1.1")
-    set(MY_CXX_FLAGS "${MY_CXX_FLAGS} -Wall -Wextra")  #Add warning flags: For "-Wall" see http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
+    set(MY_CXX_FLAGS "${MY_CXX_FLAGS} -Wall -Wextra")  #Add warning flags: For "-Wall" see https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 endif(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
 
 # Support of C++17 is still not possible due to pm_remez.h (solved in GNU Radio 3.8)
@@ -1515,7 +1515,7 @@ if(NOT (CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) AND NOT (CMAKE_CXX_COMPILER_ID M
 endif(NOT (CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) AND NOT (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
 
 # Processor-architecture related flags
-# See http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options
+# See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
 if (NOT ARCH_COMPILER_FLAGS)
     if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
         if(OS_IS_MACOSX)
@@ -1543,7 +1543,7 @@ set(MY_CXX_FLAGS "${MY_CXX_FLAGS} ${ARCH_COMPILER_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${MY_CXX_FLAGS}")
 
 if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
-    #http://gcc.gnu.org/wiki/Visibility
+    # https://gcc.gnu.org/wiki/Visibility
     add_definitions(-fvisibility=hidden)
 endif(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
 
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 33e45b9d5..8db189904 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -68,7 +68,7 @@ members of the project's leadership.
 ## Attribution
 
 This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
-available at [http://contributor-covenant.org/version/1/4][version]
+available at [https://contributor-covenant.org/version/1/4][version]
 
-[homepage]: http://contributor-covenant.org
-[version]: http://contributor-covenant.org/version/1/4/
+[homepage]: https://contributor-covenant.org
+[version]: https://contributor-covenant.org/version/1/4/