diff --git a/syntax/stata.vim b/syntax/stata.vim
index c6ae30d..c4d1036 100644
--- a/syntax/stata.vim
+++ b/syntax/stata.vim
@@ -2,8 +2,8 @@
 " Language: Stata and/or Mata
 " Maintainer: Chris Poliquin <chrispoliquin@gmail.com>
 " Note: Based on the original by Jeff Pitblado <jpitblado@stata.com>
-" Last Change: 2022-04-25
-" Version: 0.6.36
+" Last Change: 2025-12-10
+" Version: 0.6.40
 
 
 " Preamble {{{
@@ -123,8 +123,10 @@ syn keyword stataCommand class
 syn keyword stataCommand classutil
 syn keyword stataCommand clear
 syn keyword stataCommand cloglog
+syn keyword stataCommand clonevar
 syn keyword stataCommand codebook
 syn keyword stataCommand collapse
+syn keyword stataCommand collect
 syn keyword stataCommand corr[elate]
 syn keyword stataCommand compress
 syn keyword stataCommand contrast
@@ -163,6 +165,7 @@ syn keyword stataCommand erase
 syn keyword stataCommand eret[urn]
 syn keyword stataCommand err[or]
 syn keyword stataCommand estadd
+syn keyword stataCommand estat
 syn keyword stataCommand etable
 syn match stataCommand '\<estat \(ic\|summarize\|vce\|gof\)\>'
 syn match stataCommand '\<est\(imates\)\? \(save\|use\|esample\|tab\(le\)\?\|sto\(re\)\?\|res\(tore\)\?\|q\(uery\)\?\|des\(cribe\)\?\|drop\|dir\|clear\)\>'
@@ -193,8 +196,12 @@ syn keyword stataCommand graph
 syn keyword stataCommand gsort
 syn keyword stataCommand hausman
 syn keyword stataCommand help
+syn keyword stataCommand heckman
+syn keyword stataCommand heckoprobit
+syn keyword stataCommand heckpoisson
+syn keyword stataCommand heckprobit
 syn keyword stataCommand hexdump
-syn keyword stataCommand hist
+syn keyword stataCommand hist[ogram]
 syn keyword stataCommand hotelling
 syn keyword stataCommand icd9[p]
 syn keyword stataCommand icd10
@@ -205,6 +212,7 @@ syn keyword stataCommand infix
 syn keyword stataCommand input
 syn keyword stataCommand insheet
 syn keyword stataCommand inspect
+syn keyword stataCommand ipolate
 syn keyword stataCommand iqreg
 syn keyword stataCommand isid
 syn keyword stataCommand ivreg[ress]
@@ -415,6 +423,7 @@ syn keyword stataCommand xtline
 syn keyword stataCommand xtlogit
 syn keyword stataCommand xthtaylor
 syn keyword stataCommand xtintreg
+syn keyword stataCommand xtheckman
 syn keyword stataCommand xtmelogit
 syn keyword stataCommand xtmepoisson
 syn keyword stataCommand xtnbreg
@@ -443,6 +452,8 @@ syn keyword stataCommand zipfile
 syn keyword stataCommand asdoc
 syn keyword stataCommand astile
 syn keyword stataCommand collin
+syn keyword stataCommand did2s
+syn keyword stataCommand did_imputation
 syn keyword stataCommand distinct
 syn keyword stataCommand eglist
 syn keyword stataCommand estout
@@ -479,6 +490,7 @@ syn keyword stataCommand ivreg29
 syn keyword stataCommand ivreg210
 syn keyword stataCommand ivreghdfe
 syn keyword stataCommand jarowinkler
+syn keyword stataCommand jwdid
 syn keyword stataCommand keeporder
 syn keyword stataCommand kountry
 syn keyword stataCommand labcd
@@ -494,6 +506,7 @@ syn keyword stataCommand labvarch
 syn keyword stataCommand labvalclone
 syn keyword stataCommand labvalcombine
 syn keyword stataCommand mdesc
+syn keyword stataCommand mipolate
 syn keyword stataCommand missings
 syn keyword stataCommand outreg[2]
 syn keyword stataCommand ppmlhdfe
@@ -1060,12 +1073,12 @@ syn region stataFunc matchgroup=Function start=/\<vecdiag(/ end=/)/ contains=@st
 " Numbers {{{
 " -----------------------------------------------------------------------------
 " (patterns from github.com/zizhongyan/stata-vim-syntax)
-syn match stataNumber    "\<\d\>"        display
-syn match stataNumber    "\<[0-9]\d\+\>" display
-syn match stataNumber    "\<\d\+[jJ]\>"  display
-syn match stataFloat     "\.\d\+\%([eE][+-]\=\d\+\)\=[jJ]\=\>"      display
-syn match stataFloat     "\<\d\+[eE][+-]\=\d\+[jJ]\=\>"             display
-syn match stataFloat     "\<\d\+\.\d*\%([eE][+-]\=\d\+\)\=[jJ]\=\>" display
+syn match stataNumber    "\<-\?\d\>"        display
+syn match stataNumber    "\<-\?[0-9]\d\+\>" display
+syn match stataNumber    "\<-\?\d\+[jJ]\>"  display
+syn match stataFloat     "-\?\.\d\+\%([eE][+-]\=\d\+\)\=[jJ]\=\>"      display
+syn match stataFloat     "\<-\?\d\+[eE][+-]\=\d\+[jJ]\=\>"             display
+syn match stataFloat     "\<-\?\d\+\.\d*\%([eE][+-]\=\d\+\)\=[jJ]\=\>" display
 syn match stataBinNumber "\<0[bB][01]\+[lL]\=\>" display
 syn match stataBinNumber "\<0[bB][01]\+\>"       display
 syn match stataHexNumber "\<0[xX]\x\+[lL]\=\>"   display