diff --git a/platformio.ini b/platformio.ini
index 016032dd3..cdce62e9d 100755
--- a/platformio.ini
+++ b/platformio.ini
@@ -116,7 +116,7 @@ build_flags               = -D NDEBUG
 
 [core_2_6_1]
 ; *** Esp8266 core for Arduino version 2.6.1
-platform                  = espressif8266@~2.3.0
+platform                  = espressif8266@2.3.0
 build_flags               = ${esp82xx_defaults.build_flags}
                             -Wl,-Teagle.flash.1m.ld
                             -DBEARSSL_SSL_BASIC
@@ -160,7 +160,7 @@ build_flags               = ${esp82xx_defaults.build_flags}
 
 [core_2_6_2]
 ; *** Esp8266 core for Arduino version 2.6.2
-platform                  = espressif8266@~2.3.1
+platform                  = espressif8266@2.3.1
 build_flags               = ${esp82xx_defaults.build_flags}
                             -Wl,-Teagle.flash.1m.ld
                             -DBEARSSL_SSL_BASIC