diff --git a/dub.json b/dub.json
index 34bf9cf5..bc086988 100644
--- a/dub.json
+++ b/dub.json
@@ -42,10 +42,12 @@
 		{
 			"name": "integration_tests",
 			"targetType": "executable",
+			"dflags-dmd": ["-preview=in"],
 			"dependencies":
 			{
-				"dpq2": "*",
-				"gfm:math": "~>7.0.0"
+				"dpq2": { "version": "*", "dflags-dmd": ["-preview=in"] },
+				"vibe-d:data": { "version": "*", "dflags-dmd": ["-preview=in"] },
+				"gfm:math": "~>8.0.6"
 			},
 			"configurations": [
 				{
@@ -75,9 +77,11 @@
 		{
 			"name": "example",
 			"targetType": "executable",
+			"dflags": ["-preview=in"],
 			"dependencies":
 			{
-				"dpq2": "*"
+				"dpq2": { "version": "*", "dflags": ["-preview=in"] },
+				"vibe-d:data": { "version": "*", "dflags": ["-preview=in"] },
 			},
 			"sourcePaths": [ "example" ]
 		}
diff --git a/src/dpq2/conv/to_d_types.d b/src/dpq2/conv/to_d_types.d
index 2049222d..3130460b 100644
--- a/src/dpq2/conv/to_d_types.d
+++ b/src/dpq2/conv/to_d_types.d
@@ -154,7 +154,7 @@ Value[] deserializeRecord(in Value v)
                 "Value length isn't enough to hold object body", __FILE__, __LINE__);
         immutable(ubyte)[] resData = data[0 .. size];
         data = data[size .. $];
-        res = Value(resData, oidType);
+        res = Value(resData.idup, oidType);
     }
 
     return ret;
@@ -369,7 +369,7 @@ if( is(T == BitArray) )
             )
         );
 
-    auto data = v.data;
+    auto data = v.data[];
     size_t len = data.read!int;
     size_t[] newData;
     foreach (ch; data.chunks(size_t.sizeof))
diff --git a/src/dpq2/value.d b/src/dpq2/value.d
index 06c02394..91ef1f46 100644
--- a/src/dpq2/value.d
+++ b/src/dpq2/value.d
@@ -51,7 +51,7 @@ struct Value
         this._oidType = oidType;
     }
 
-    @safe const pure nothrow @nogc
+    @safe const pure nothrow scope @nogc
     {
         /// Indicates if the value is NULL
         bool isNull()
@@ -84,7 +84,8 @@ struct Value
         _oidType = type;
     }
 
-    immutable(ubyte)[] data() pure const
+    //TODO: replace template by return modifier
+    immutable(ubyte)[] data()() pure const scope
     {
         import std.exception;
         import core.exception;
@@ -158,7 +159,7 @@ class ValueConvException : ConvException
     }
 }
 
-package void throwTypeComplaint(OidType receivedType, string expectedType, string file = __FILE__, size_t line = __LINE__) pure
+package void throwTypeComplaint(OidType receivedType, in string expectedType, string file = __FILE__, size_t line = __LINE__) pure
 {
     throw new ValueConvException(
             ConvExceptionType.NOT_IMPLEMENTED,