diff --git a/languages.toml b/languages.toml
index cc437f78c..e115a4092 100644
--- a/languages.toml
+++ b/languages.toml
@@ -49,7 +49,7 @@ jsonnet-language-server = { command = "jsonnet-language-server", args= ["-t", "-
 julia = { command = "julia", timeout = 60, args = [ "--startup-file=no", "--history-file=no", "--quiet", "-e", "using LanguageServer; runserver()", ] }
 koka = { command = "koka", args = ["--language-server", "--lsstdio"] }
 kotlin-language-server = { command = "kotlin-language-server" }
-lean = { command = "lean", args = [ "--server" ] }
+lean = { command = "lean", args = [ "--server", "--memory=1024" ] }
 ltex-ls = { command = "ltex-ls" }
 markdoc-ls = { command = "markdoc-ls", args = ["--stdio"] }
 markdown-oxide = { command = "markdown-oxide" }