diff --git a/src/core/operations/GOSTDecrypt.mjs b/src/core/operations/GOSTDecrypt.mjs
index e9699f84..2e7467da 100644
--- a/src/core/operations/GOSTDecrypt.mjs
+++ b/src/core/operations/GOSTDecrypt.mjs
@@ -56,7 +56,7 @@ class GOSTDecrypt extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",
diff --git a/src/core/operations/GOSTEncrypt.mjs b/src/core/operations/GOSTEncrypt.mjs
index cb67476c..82bdaeda 100644
--- a/src/core/operations/GOSTEncrypt.mjs
+++ b/src/core/operations/GOSTEncrypt.mjs
@@ -56,7 +56,7 @@ class GOSTEncrypt extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",
diff --git a/src/core/operations/GOSTKeyUnwrap.mjs b/src/core/operations/GOSTKeyUnwrap.mjs
index 7a3e29cb..52b0a9ec 100644
--- a/src/core/operations/GOSTKeyUnwrap.mjs
+++ b/src/core/operations/GOSTKeyUnwrap.mjs
@@ -56,7 +56,7 @@ class GOSTKeyUnwrap extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",
diff --git a/src/core/operations/GOSTKeyWrap.mjs b/src/core/operations/GOSTKeyWrap.mjs
index d8692023..443c9ba0 100644
--- a/src/core/operations/GOSTKeyWrap.mjs
+++ b/src/core/operations/GOSTKeyWrap.mjs
@@ -56,7 +56,7 @@ class GOSTKeyWrap extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",
diff --git a/src/core/operations/GOSTSign.mjs b/src/core/operations/GOSTSign.mjs
index d83caab7..2af850e7 100644
--- a/src/core/operations/GOSTSign.mjs
+++ b/src/core/operations/GOSTSign.mjs
@@ -56,7 +56,7 @@ class GOSTSign extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",
diff --git a/src/core/operations/GOSTVerify.mjs b/src/core/operations/GOSTVerify.mjs
index 085a46c2..2fa362fb 100644
--- a/src/core/operations/GOSTVerify.mjs
+++ b/src/core/operations/GOSTVerify.mjs
@@ -57,7 +57,7 @@ class GOSTVerify extends Operation {
                 value: [
                     {
                         name: "GOST 28147 (1989)",
-                        on: [6]
+                        on: [5]
                     },
                     {
                         name: "GOST R 34.12 (Magma, 2015)",