diff --git a/pkgs/tools/networking/openapi-generator-cli/default.nix b/pkgs/tools/networking/openapi-generator-cli/default.nix
index a5271bf410f1..787067881a2f 100644
--- a/pkgs/tools/networking/openapi-generator-cli/default.nix
+++ b/pkgs/tools/networking/openapi-generator-cli/default.nix
@@ -1,7 +1,7 @@
 { lib, stdenv, fetchurl, jre, makeWrapper }:
 
 stdenv.mkDerivation rec {
-  version = "4.3.1";
+  version = "5.0.0";
   pname = "openapi-generator-cli";
 
   jarfilename = "${pname}-${version}.jar";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "mirror://maven/org/openapitools/${pname}/${version}/${jarfilename}";
-    sha256 = "1h9infspwbij9ahb376vc4ijakrqb7xww573ccrqvchxphbcsf7l";
+    sha256 = "13kgc84kyrypr0xy4xifrzqcy4qlvcxc7f0jy3n1xkjl3vhav7w3";
   };
 
   phases = [ "installPhase" ];
diff --git a/pkgs/tools/networking/openapi-generator-cli/unstable.nix b/pkgs/tools/networking/openapi-generator-cli/unstable.nix
index a0af97b2ea9a..1384f35a3f20 100644
--- a/pkgs/tools/networking/openapi-generator-cli/unstable.nix
+++ b/pkgs/tools/networking/openapi-generator-cli/unstable.nix
@@ -1,7 +1,7 @@
 { lib, stdenv, fetchurl, jre, makeWrapper }:
 
 stdenv.mkDerivation rec {
-  version = "5.0.0-2020-02-04";
+  version = "6.0.0-2021-01-18";  # Also update the fetchurl link
   pname = "openapi-generator-cli";
 
   jarfilename = "${pname}-${version}.jar";
@@ -11,8 +11,8 @@ stdenv.mkDerivation rec {
   ];
 
   src = fetchurl {
-    url = "https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/5.0.0-SNAPSHOT/openapi-generator-cli-5.0.0-20200204.091421-37.jar";
-    sha256 = "0swv976fcr2z8g53avr0r706c31xacb2dlnl8b4c8mzmi49byy7k";
+    url = "https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/6.0.0-SNAPSHOT/openapi-generator-cli-6.0.0-20210118.082537-4.jar";
+    sha256 = "1ji3yw9dp4srlgqxvb21vrcp2bzj4himxsmp8l8zid9nxsc1m71x";
   };
 
   phases = [ "installPhase" ];