diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4bbd82d..7bb406d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,13 +1,13 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.3.0
     hooks:
     -   id: trailing-whitespace
     -   id: no-commit-to-branch
         args: [-b, main]
 
   - repo: https://github.com/psf/black
-    rev: 21.9b0
+    rev: 22.6.0
     hooks:
       - id: black
         name: black
@@ -16,13 +16,13 @@ repos:
         types: [python]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.910-1
+    rev: v0.961
     hooks:
       - id: mypy
         exclude: ^docs/conf.py
 
   - repo: https://gitlab.com/yaq/yaq-traits
-    rev: v2021.10.0
+    rev: v2022.3.0
     hooks:
       - id: yaq-traits-check
       - id: yaq-traits-compose
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47484df..aac8c53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Changed
+- changed symbols to valid avro types
+
 ## [2021.10.0]
 
 ### Changed
diff --git a/yaqd_ti/_ads1115.py b/yaqd_ti/_ads1115.py
index d5f67de..dadee87 100644
--- a/yaqd_ti/_ads1115.py
+++ b/yaqd_ti/_ads1115.py
@@ -82,9 +82,9 @@ async def _measure(self):
             data = self.bus.read_i2c_block_data(self.address, 0x00, 2)
             v = data[0] << 8 | data[1]
             if v > 128:
-                v = -(2 ** 16) + v
+                v = -(2**16) + v
             v *= self.fsr
-            v /= 2 ** 16
+            v /= 2**16
             v *= 2
             out[key] = v
             await asyncio.sleep(0.1)
diff --git a/yaqd_ti/ads1115.avpr b/yaqd_ti/ads1115.avpr
index 8a6a114..618a913 100644
--- a/yaqd_ti/ads1115.avpr
+++ b/yaqd_ti/ads1115.avpr
@@ -3,14 +3,14 @@
         "channels": {
             "name": "channels",
             "symbols": [
-                "01",
-                "03",
-                "13",
-                "23",
-                "0",
-                "1",
-                "2",
-                "3"
+                "C01",
+                "C03",
+                "C13",
+                "C23",
+                "C0",
+                "C1",
+                "C2",
+                "C3"
             ],
             "type": "enum"
         },
@@ -23,11 +23,11 @@
         "fsr": {
             "name": "fsr",
             "symbols": [
-                "6.144",
-                "4.096",
-                "2.048",
-                "1.024",
-                "0.512"
+                "V6_144",
+                "V4_096",
+                "V2_048",
+                "V1_024",
+                "V0_512"
             ],
             "type": "enum"
         },
@@ -92,14 +92,14 @@
         "rate": {
             "name": "rate",
             "symbols": [
-                "8",
-                "16",
-                "32",
-                "64",
-                "128",
-                "250",
-                "475",
-                "860"
+                "R8",
+                "R16",
+                "R32",
+                "R64",
+                "R128",
+                "R250",
+                "R475",
+                "R860"
             ],
             "type": "enum"
         },
@@ -196,9 +196,9 @@
             "response": {
                 "type": "map",
                 "values": [
+                    "int",
                     "double",
-                    "ndarray",
-                    "int"
+                    "ndarray"
                 ]
             }
         },
diff --git a/yaqd_ti/ads1115.toml b/yaqd_ti/ads1115.toml
index 42a5359..a3c900f 100644
--- a/yaqd_ti/ads1115.toml
+++ b/yaqd_ti/ads1115.toml
@@ -17,24 +17,24 @@ conda-forge = "https://anaconda.org/conda-forge/yaqd-ti"
 [config.channels]
 type = "enum"
 name = "channels"
-symbols = ["01",
-           "03",
-	   "13",
-	   "23",
-	   "0",
-	   "1",
-	   "2",
-	   "3"
+symbols = ["C01",
+           "C03",
+	   "C13",
+	   "C23",
+	   "C0",
+	   "C1",
+	   "C2",
+	   "C3"
 	   ]
 
 [config.fsr]
 type = "enum"
 name = "fsr"
-symbols = ["6.144",
-           "4.096",
-	   "2.048",
-	   "1.024",
-	   "0.512"
+symbols = ["V6_144",
+           "V4_096",
+	   "V2_048",
+	   "V1_024",
+	   "V0_512"
 	   ]
 
 [config.i2c_addr]
@@ -43,12 +43,12 @@ default = 72
 [config.rate]
 type = "enum"
 name = "rate"
-symbols = ["8",
-           "16",
-	   "32",
-	   "64",
-	   "128",
-	   "250",
-	   "475",
-	   "860"
+symbols = ["R8",
+           "R16",
+	   "R32",
+	   "R64",
+	   "R128",
+	   "R250",
+	   "R475",
+	   "R860"
 	   ]