diff --git a/pkg/cli/values/options_test.go b/pkg/cli/values/options_test.go
index 6debb693e..571c5b3c3 100644
--- a/pkg/cli/values/options_test.go
+++ b/pkg/cli/values/options_test.go
@@ -294,7 +294,7 @@ func TestMergeValuesCLI(t *testing.T) {
 			},
 			expected: map[string]any{
 				"foo": map[string]any{
-					"bar": []any{1.0, 2.0, 3.0},
+					"bar": []any{int64(1), int64(2), int64(3)},
 				},
 			},
 		},
diff --git a/pkg/strvals/parser.go b/pkg/strvals/parser.go
index be3b1e71b..950c63ab0 100644
--- a/pkg/strvals/parser.go
+++ b/pkg/strvals/parser.go
@@ -224,10 +224,11 @@ func (t *parser) key(data map[string]any, nestedNameLevel int) (reterr error) {
 				// discard in t.sc the chars of the decoded json value (the number of those characters is returned by InputOffset).
 				var jsonval any
 				dec := json.NewDecoder(strings.NewReader(t.sc.String()))
+				dec.UseNumber()
 				if err := dec.Decode(&jsonval); err != nil {
 					return err
 				}
-				set(data, string(k), jsonval)
+				set(data, string(k), convertJSONNumbers(jsonval))
 				if _, err = io.CopyN(io.Discard, t.sc, dec.InputOffset()); err != nil {
 					return err
 				}
@@ -356,10 +357,11 @@ func (t *parser) listItem(list []any, i, nestedNameLevel int) ([]any, error) {
 			// discard in t.sc the chars of the decoded json value (the number of those characters is returned by InputOffset).
 			var jsonval any
 			dec := json.NewDecoder(strings.NewReader(t.sc.String()))
+			dec.UseNumber()
 			if err := dec.Decode(&jsonval); err != nil {
 				return list, err
 			}
-			if list, err = setIndex(list, i, jsonval); err != nil {
+			if list, err = setIndex(list, i, convertJSONNumbers(jsonval)); err != nil {
 				return list, err
 			}
 			if _, err = io.CopyN(io.Discard, t.sc, dec.InputOffset()); err != nil {
@@ -555,3 +557,33 @@ func typedVal(v []rune, st bool) any {
 
 	return val
 }
+
+// convertJSONNumbers walks a value decoded by encoding/json with UseNumber
+// enabled and turns every json.Number into an int64 when it is integral, or a
+// float64 otherwise. Decoding into an any without UseNumber makes every JSON
+// number a float64, which silently loses precision for integers beyond 2^53
+// (for example 9007199254740993 becomes 9007199254740992). This keeps the
+// --set-json path consistent with the plain --set path, whose typedVal parses
+// integers as int64.
+func convertJSONNumbers(v any) any {
+	switch val := v.(type) {
+	case json.Number:
+		if iv, err := val.Int64(); err == nil {
+			return iv
+		}
+		fv, _ := val.Float64()
+		return fv
+	case map[string]any:
+		for k, e := range val {
+			val[k] = convertJSONNumbers(e)
+		}
+		return val
+	case []any:
+		for i, e := range val {
+			val[i] = convertJSONNumbers(e)
+		}
+		return val
+	default:
+		return v
+	}
+}
diff --git a/pkg/strvals/parser_test.go b/pkg/strvals/parser_test.go
index 73fc3f206..85e60f840 100644
--- a/pkg/strvals/parser_test.go
+++ b/pkg/strvals/parser_test.go
@@ -642,6 +642,51 @@ func TestParseJSON(t *testing.T) {
 	}
 }
 
+func TestParseJSONNumbers(t *testing.T) {
+	// A JSON integer must round-trip exactly, including values above 2^53
+	// where a float64 would lose precision. This mirrors the plain --set
+	// path, which parses integers as int64.
+	tests := []struct {
+		name   string
+		input  string
+		expect map[string]any
+	}{
+		{
+			name:   "integer beyond 2^53 keeps its exact value",
+			input:  "id=9007199254740993",
+			expect: map[string]any{"id": int64(9007199254740993)},
+		},
+		{
+			name:   "small integer decodes as int64",
+			input:  "n=3",
+			expect: map[string]any{"n": int64(3)},
+		},
+		{
+			name:   "negative large integer keeps its exact value",
+			input:  "n=-9223372036854775807",
+			expect: map[string]any{"n": int64(-9223372036854775807)},
+		},
+		{
+			name:   "fractional value stays a float",
+			input:  "ratio=1.5",
+			expect: map[string]any{"ratio": float64(1.5)},
+		},
+		{
+			name:   "integers nested in objects and arrays keep their exact value",
+			input:  `obj={"big":9007199254740993,"list":[9007199254740995]}`,
+			expect: map[string]any{"obj": map[string]any{"big": int64(9007199254740993), "list": []any{int64(9007199254740995)}}},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := map[string]any{}
+			err := ParseJSON(tt.input, got)
+			require.NoError(t, err)
+			assert.Equal(t, tt.expect, got)
+		})
+	}
+}
+
 func TestParseFile(t *testing.T) {
 	input := "name1=path1"
 	expect := map[string]any{