diff --git a/.gitignore b/.gitignore
index 91ca00d..2fc3419 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,4 @@ otp_src_R14A.tar.gz
 /otp-OTP-18.2.3.tar.gz
 /otp-OTP-18.2.4.tar.gz
 /otp-OTP-18.3.tar.gz
+/otp-OTP-18.3.1.tar.gz
diff --git a/sources b/sources
index 5588a52..a073951 100644
--- a/sources
+++ b/sources
@@ -1,2 +1 @@
-0ea13f170092d73f014c27296825bfc9  otp-OTP-18.2.4.tar.gz
-9302351b5dcd74d86fb67d8c28ad94d2  otp-OTP-18.3.tar.gz
+03fd1ccf4e82bc093dd0e514275909df  otp-OTP-18.3.1.tar.gz