diff --git a/README.md b/README.md
index b1333d8e..fc96f957 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_PEERPLAYS_TESTNET=1
 # make -j8 for 32GB RAM
 make -j$(nproc)
 
-make install # this can install the executable files under /usr/local
+sudo make install # this can install the executable files under /usr/local
 ```
 
 ## Ubuntu 18.04
@@ -142,7 +142,7 @@ cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_PEERPLAYS_TESTNET=1
 # make -j8 for 32GB RAM
 make -j$(nproc)
 
-make install # this can install the executable files under /usr/local
+sudo make install # this can install the executable files under /usr/local
 ```
 
 
diff --git a/libraries/chain/hardfork.d/SON3.hf b/libraries/chain/hardfork.d/SON3.hf
index 6abf3f34..36347c09 100644
--- a/libraries/chain/hardfork.d/SON3.hf
+++ b/libraries/chain/hardfork.d/SON3.hf
@@ -1,7 +1,7 @@
 #ifndef HARDFORK_SON3_TIME
 #ifdef BUILD_PEERPLAYS_TESTNET
-#define HARDFORK_SON3_TIME (fc::time_point_sec::from_iso_string("2022-04-30T00:00:00"))
+#define HARDFORK_SON3_TIME (fc::time_point_sec::from_iso_string("2022-05-31T00:00:00"))
 #else
-#define HARDFORK_SON3_TIME (fc::time_point_sec::from_iso_string("2022-04-30T00:00:00"))
+#define HARDFORK_SON3_TIME (fc::time_point_sec::from_iso_string("2022-05-31T00:00:00"))
 #endif
 #endif