diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7921262..3050513 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -29,6 +29,6 @@ repos:
       - id: flake8
 
   - repo: https://github.com/rbubley/mirrors-prettier
-    rev: "v3.8.4"
+    rev: "v3.9.1"
     hooks:
       - id: prettier
diff --git a/stringcalc/data/daddario-stp.csv b/stringcalc/data/daddario-stp.csv
index 7e4cc9f..c4588b3 100644
--- a/stringcalc/data/daddario-stp.csv
+++ b/stringcalc/data/daddario-stp.csv
@@ -1,7 +1,4 @@
 id,uw,gauge,instruments,group,group_id
-BEB028,2.2966e-05,0.0285,Classical Guitar,Black Nylon,BEB
-BEB032,3.0234e-05,0.0327,Classical Guitar,Black Nylon,BEB
-BEB040,4.592e-05,0.04,Classical Guitar,Black Nylon,BEB
 BEB031W,0.00010373,0.031,Classical Guitar,80/20 Bronze,BEBW
 BEB037W,0.00020248,0.037,Classical Guitar,80/20 Bronze,BEBW
 BEB045W,0.00033228,0.045,Classical Guitar,80/20 Bronze,BEBW
@@ -77,7 +74,6 @@ J2704,0.00010754,0.029,"Classical Guitar, Mandolin, Other Instruments, Ukulele",
 J4504,0.00010754,0.029,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J27H04,0.0001118,0.03,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4604,0.0001118,0.03,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
-J4502,2.9316e-05,0.0322,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4602,3.0234e-05,0.0327,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4305,0.0001695,0.033,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4402,3.1165e-05,0.0332,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
@@ -93,6 +89,7 @@ J4306,0.00028498,0.042,"Classical Guitar, Mandolin, Other Instruments, Ukulele",
 J4506,0.0003101,0.043,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4606,0.00033248,0.044,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4406,0.00034232,0.045,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
+J4502,2.9316e-05,,"Classical Guitar, Mandolin, Other Instruments, Ukulele",Various,J
 J4604C,0.00010521,0.029,Classical Guitar,Various,JC
 J4404C,0.00010988,0.03,Classical Guitar,Various,JC
 J4505C,0.00018034,0.035,Classical Guitar,Various,JC
diff --git a/stringcalc/frets.py b/stringcalc/frets.py
index b7c47a2..a76d16c 100644
--- a/stringcalc/frets.py
+++ b/stringcalc/frets.py
@@ -82,7 +82,7 @@ def distances(N: int, *, L: float, method: str = "et") -> pd.DataFrame:
     else:
         raise ValueError(f"invalid `method` {method!r}")
 
-    dd = np.append(d[0], np.diff(d))  # type: ignore[index]
+    dd = np.append(d[0], np.diff(d))  # type: ignore[index,call-overload]
 
     # TODO: d to +5 or +7 frets?
     # TODO: comparison to just intonation for specified root