diff --git a/dysgu/filter_normals.py b/dysgu/filter_normals.py
index cc3ed1e..c2dbba3 100644
--- a/dysgu/filter_normals.py
+++ b/dysgu/filter_normals.py
@@ -1025,13 +1025,13 @@ def run_filtering(args):
         if mq_pri < min_mapq and mq_sup < min_mapq:
             filter_results['lowMapQ'] += 1
             if keep_all:
-                update_filter_value(r, old_filter_value, pass_prob, new_value="lowMapQ")
+                update_filter_value(r, sample_name, old_filter_value, pass_prob, new_value="lowMapQ")
                 out_vcf.write(r)
             continue
         if min_prob != 0 and 'PROB' in r.samples[sample_name] and r.samples[sample_name]['PROB'] < min_prob:
             filter_results['lowProb'] += 1
             if keep_all:
-                update_filter_value(r, old_filter_value, pass_prob, new_value="lowProb")
+                update_filter_value(r, sample_name, old_filter_value, pass_prob, new_value="lowProb")
                 out_vcf.write(r)
             continue
         if has_low_support(r, sample_name, support_fraction):
diff --git a/pyproject.toml b/pyproject.toml
index 8f99976..4828dd8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,13 +34,6 @@ dependencies = [
 [project.urls]
 Homepage = "https://github.com/kcleal/dysgu"
 
-[project.optional-dependencies]
-test = [
-    "pytest",
-    "pytest-cov",
-    "pytest-mock",
-]
-
 [project.scripts]
 dysgu = "dysgu.main:cli"
 
diff --git a/requirements.txt b/requirements.txt
index 62c981e..130c1c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 setuptools>=63.0
-cython
+Cython
 click>=8.0
 numpy
 scipy