diff --git a/CHANGELOG.md b/CHANGELOG.md
index 132572896..c3daf661a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Fixed
 
 - Fixes empty request body on retry with compression enabled ([#543](https://github.com/opensearch-project/opensearch-go/pull/543))
+- Fixes `Conditions` in `PolicyStateTransition` of ISM plugin ([#556](https://github.com/opensearch-project/opensearch-go/pull/556))
 
 ### Security
 
@@ -118,7 +119,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Solves linting complains for opensearchtransport ([#353](https://github.com/opensearch-project/opensearch-go/pull/353))
 - Updates Developer guide to include docker build instructions ([#385](https://github.com/opensearch-project/opensearch-go/pull/385))
 - Tests against version 2.9.0, 2.10.0, run tests in all branches, changes integration tests to wait for OpenSearch to start ([#392](https://github.com/opensearch-project/opensearch-go/pull/392))
-- Makefile: uses docker golangci-lint, run integration test on `.` folder, change coverage generation ([#392](https://github.com/opensearch-project/opensearch-go/pull/392)) 
+- Makefile: uses docker golangci-lint, run integration test on `.` folder, change coverage generation ([#392](https://github.com/opensearch-project/opensearch-go/pull/392))
 - golangci-lint: updates rules and fail when issues are found ([#421](https://github.com/opensearch-project/opensearch-go/pull/421))
 - go: updates to golang version 1.20 ([#421](https://github.com/opensearch-project/opensearch-go/pull/421))
 - guids: updates to work for the new opensearchapi ([#421](https://github.com/opensearch-project/opensearch-go/pull/421))
diff --git a/plugins/ism/api_policies.go b/plugins/ism/api_policies.go
index 8c78f09a7..523cc1e6b 100644
--- a/plugins/ism/api_policies.go
+++ b/plugins/ism/api_policies.go
@@ -246,17 +246,23 @@ type PolicyStateRollup struct {
 	} `json:"ism_rollup"`
 }
 
-// PolicyStateTransition is a sub type of PolicyState containing information about transitios to other states
+// PolicyStateTransitionCondition is a sub type of PolicyStateTransition containing conditions for a transition
+type PolicyStateTransitionCondition struct {
+	MinIndexAge    string                              `json:"min_index_age,omitempty"`
+	MinRolloverAge string                              `json:"min_rollover_age,omitempty"`
+	MinDocCount    int                                 `json:"min_doc_count,omitempty"`
+	MinSize        string                              `json:"min_size,omitempty"`
+	Cron           *PolicyStateTransitionConditionCron `json:"cron,omitempty"`
+}
+
+// PolicyStateTransitionConditionCron is a sub type of PolicyStateTransitionCondition containing a cron expression and timezone
+type PolicyStateTransitionConditionCron struct {
+	Expression string `json:"expression"`
+	Timezone   string `json:"timezone"`
+}
+
+// PolicyStateTransition is a sub type of PolicyState containing information about transition to other states
 type PolicyStateTransition struct {
-	StateName  string `json:"state_name"`
-	Conditions []struct {
-		MinIndexAge    string `json:"min_index_age,omitempty"`
-		MinRolloverAge string `json:"min_rollover_age,omitempty"`
-		MinDocCount    int    `json:"min_doc_count,omitempty"`
-		MinSize        string `json:"min_size,omitempty"`
-		Cron           *struct {
-			Expression string `json:"expression"`
-			Timezone   string `json:"timezone"`
-		} `json:"cron,omitempty"`
-	} `json:"conditions"`
+	StateName  string                          `json:"state_name"`
+	Conditions *PolicyStateTransitionCondition `json:"conditions"`
 }
diff --git a/plugins/ism/api_test.go b/plugins/ism/api_test.go
index a766e6f9a..0ff4f2b93 100644
--- a/plugins/ism/api_test.go
+++ b/plugins/ism/api_test.go
@@ -9,6 +9,7 @@
 package ism_test
 
 import (
+	"context"
 	"testing"
 	"time"
 
@@ -257,4 +258,51 @@ func TestClient(t *testing.T) {
 		})
 	})
 
+	t.Run("Put Policy with Transitions Conditions", func(t *testing.T) {
+		testRetentionPolicy := "testRetentionPolicy"
+		t.Cleanup(func() {
+			client.Policies.Delete(context.Background(), ism.PoliciesDeleteReq{Policy: testRetentionPolicy})
+		})
+		transitions := []ism.PolicyStateTransition{
+			{
+				StateName: "delete",
+				Conditions: &ism.PolicyStateTransitionCondition{
+					MinIndexAge: "1h",
+				},
+			},
+		}
+		_, err = client.Policies.Put(
+			context.Background(),
+			ism.PoliciesPutReq{
+				Policy: testRetentionPolicy,
+				Body: ism.PoliciesPutBody{
+					Policy: ism.PolicyBody{
+						Description:  "test policy with transitions conditions",
+						DefaultState: "test-transitions",
+						States: []ism.PolicyState{
+							{
+								Name:        "test-transitions",
+								Transitions: &transitions,
+							},
+							{
+								Name: "delete",
+								Actions: []ism.PolicyStateAction{
+									{
+										Delete: &ism.PolicyStateDelete{},
+									},
+								},
+							},
+						},
+						Template: []ism.Template{
+							{
+								IndexPatterns: []string{"test-transitions"},
+								Priority:      21,
+							},
+						},
+					},
+				},
+			},
+		)
+		require.Nil(t, err)
+	})
 }