diff --git a/custom-completions/scoop/scoop-completions.nu b/custom-completions/scoop/scoop-completions.nu
index 9c0113b..e4c250b 100644
--- a/custom-completions/scoop/scoop-completions.nu
+++ b/custom-completions/scoop/scoop-completions.nu
@@ -33,7 +33,7 @@ def scoopInstalledAppsWithStar [] {
 # list of all manifests from all buckets
 def scoopAllApps [] {
   let bucketsDir = if ('SCOOP' in (env).name) { [ (getenv 'SCOOP'), 'buckets' ] | path join } else { [ (getenv 'USERPROFILE'), 'scoop', 'buckets' ] | path join }
-  (ls -s $bucketsDir | get name) | each {|bucket| ls ([$bucketsDir, $bucket, 'bucket', '*.json'] | str join '\')  | get name | path basename | str substring ',-5' } | flatten | uniq
+  (ls -s $bucketsDir | get name) | each {|bucket| ls ([$bucketsDir, $bucket, 'bucket', '*.json'] | str join '\')  | get name | path basename | str substring ..-5 } | flatten | uniq
 }
 
 # list of all apps that are not installed
diff --git a/make_release/get_coverage.nu b/make_release/get_coverage.nu
index 4bf1bfe..651f4cc 100755
--- a/make_release/get_coverage.nu
+++ b/make_release/get_coverage.nu
@@ -9,7 +9,7 @@ def main [
    ] {
    cargo llvm-cov show-env --export-prefix | 
        lines | 
-       str substring '7,' | 
+       str substring 7.. | 
        split column '=' | 
        str trim -c '"'  | 
        transpose | 
diff --git a/nvim/nvim.nu b/nvim/nvim.nu
index e3314a6..9d47a8f 100644
--- a/nvim/nvim.nu
+++ b/nvim/nvim.nu
@@ -54,7 +54,7 @@ export-env {
 def edit [action file] {
     if 'NVIM' in ($env | columns) {
         let af = ($file | each {|f|
-            if ($f|str substring ',1') in ['/', '~'] {
+            if ($f|str substring ..1) in ['/', '~'] {
                 $f
             } else {
                 $"($env.PWD)/($f)"
diff --git a/prompt/oh-my-minimal.nu b/prompt/oh-my-minimal.nu
index e05c3cf..72330e8 100644
--- a/prompt/oh-my-minimal.nu
+++ b/prompt/oh-my-minimal.nu
@@ -51,7 +51,7 @@ export def path_abbrev_if_needed [apath term_width] {
     if (($apath | str length) > ($term_width / 2)) {
         # get all the tokens except the last
         let tokens = ($splits | take ($splits_len - 1) | each {|x|
-            $"($T)($x | str substring 0,1)($R)"
+            $"($T)($x | str substring 0..1)($R)"
         })
 
         # append the last part of the path
@@ -71,7 +71,7 @@ export def path_abbrev_if_needed [apath term_width] {
             let top_part = ($splits | first ($splits_len - 1))
             let end_part = ($splits | last)
             let tokens = ($top_part | each {|x|
-                $"/($T)($x | str substring 0,1)($R)"
+                $"/($T)($x | str substring 0..1)($R)"
             })
             let tokens = ($tokens | append $"/($PB)($end_part)($R)")
             $tokens | skip 1 | str join $"($T)"
diff --git a/prompt/oh-my.nu b/prompt/oh-my.nu
index abe0e2f..8d8a55a 100644
--- a/prompt/oh-my.nu
+++ b/prompt/oh-my.nu
@@ -26,7 +26,7 @@ def home_abbrev [os_name] {
     } else {
         if ($os_name =~ "windows") {
             # remove the C: from the path
-            $env.PWD | str replace -a '\\' '/' | str substring '2,'
+            $env.PWD | str replace -a '\\' '/' | str substring 2..
         } else {
             $env.PWD
         }
diff --git a/prompt/panache-git.nu b/prompt/panache-git.nu
index b5bd0a6..1bf7f40 100644
--- a/prompt/panache-git.nu
+++ b/prompt/panache-git.nu
@@ -77,7 +77,7 @@ export def repo-structured [] {
     | split column ' ' col1 col2 full_hash
     | get full_hash
     | first
-    | str substring [0 7]
+    | str substring 0..7
   } else {
     ''
   })