diff --git a/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/raised_cosine_filter.py b/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/raised_cosine_filter.py
index d2a85f0..8f054a7 100644
--- a/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/raised_cosine_filter.py
+++ b/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/raised_cosine_filter.py
@@ -85,7 +85,7 @@ class RaisedCosineFilter(PulseShapingFilter):
         """
         t_symbol = self.upsampling_factor
         beta = self.beta
-        with np.errstate(divide='ignore', invalid='ignore'):
+        with np.errstate(divide="ignore", invalid="ignore"):
             f_val = (
                 1
                 / t_symbol
diff --git a/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/root_raised_cosine_filter.py b/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/root_raised_cosine_filter.py
index 39ba623..9fa6b69 100644
--- a/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/root_raised_cosine_filter.py
+++ b/src/ria_toolkit_oss/signal/block_generator/pulse_shaping/root_raised_cosine_filter.py
@@ -86,7 +86,7 @@ class RootRaisedCosineFilter(PulseShapingFilter):
         alpha = 4 * beta * t / t_symbol
 
         t[t == 0] = 1e9
-        with np.errstate(divide='ignore', invalid='ignore'):
+        with np.errstate(divide="ignore", invalid="ignore"):
             f_val = (np.sin(np.pi * t / t_symbol * (1 - beta)) + alpha * np.cos(np.pi * t / t_symbol * (1 + beta))) / (
                 np.pi * t * (1 - alpha**2)
             )