diff --git a/dalle2_pytorch/dalle2_pytorch.py b/dalle2_pytorch/dalle2_pytorch.py
index 58d6712..952c9f2 100644
--- a/dalle2_pytorch/dalle2_pytorch.py
+++ b/dalle2_pytorch/dalle2_pytorch.py
@@ -1704,10 +1704,12 @@ class LowresConditioner(nn.Module):
 
             # allow for drawing a random sigma between lo and hi float values
             if isinstance(blur_sigma, tuple):
+                blur_sigma = tuple(map(float, blur_sigma))
                 blur_sigma = random.uniform(*blur_sigma)
 
             # allow for drawing a random kernel size between lo and hi int values
             if isinstance(blur_kernel_size, tuple):
+                blur_kernel_size = tuple(map(int, blur_kernel_size))
                 kernel_size_lo, kernel_size_hi = blur_kernel_size
                 blur_kernel_size = random.randrange(kernel_size_lo, kernel_size_hi + 1)
 
diff --git a/dalle2_pytorch/version.py b/dalle2_pytorch/version.py
index 400a104..085bc85 100644
--- a/dalle2_pytorch/version.py
+++ b/dalle2_pytorch/version.py
@@ -1 +1 @@
-__version__ = '0.6.7'
+__version__ = '0.6.8'