diff --git a/REQUIRE b/REQUIRE
index 9a2cb74..2cdca7f 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,2 +1,2 @@
 julia 0.6
-Compat 0.54
+Compat 0.62
diff --git a/src/match.jl b/src/match.jl
index 4228cf3..f41dea6 100644
--- a/src/match.jl
+++ b/src/match.jl
@@ -11,7 +11,7 @@ function store!(env, name, ex)
 end
 
 isbinding(s) = false
-isbinding(s::Symbol) = contains(string(s), r"[^_]_(_str)?$")
+isbinding(s::Symbol) = occursin(r"[^_]_(_str)?$", string(s))
 
 function bname(s::Symbol)
   Symbol(Base.match(r"^@?(.*?)_+(_str)?$", string(s)).captures[1])
@@ -26,7 +26,7 @@ match_inner(pat::QuoteNode, ex::QuoteNode, env) =
   match(pat.value, ex.value, env)
 
 isslurp(s) = false
-isslurp(s::Symbol) = s == :__ || contains(string(s), r"[^_]__$")
+isslurp(s::Symbol) = s == :__ || occursin(r"[^_]__$", string(s))
 
 function slurprange(pat)
   slurps = length(filter(isslurp, pat))
diff --git a/src/types.jl b/src/types.jl
index 7e22532..2187863 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -4,7 +4,9 @@ struct TypeBind
 end
 
 istb(s) = false
-istb(s::Symbol) = !(endswith(string(s), "_") || endswith(string(s), "_str")) && contains(string(s), "_")
+istb(s::Symbol) = !(endswith(string(s), "_") ||
+                    endswith(string(s), "_str")) &&
+                    occursin("_", string(s))
 
 tbname(s::Symbol) = Symbol(split(string(s), "_")[1])
 tbname(s::TypeBind) = s.name
diff --git a/src/utils.jl b/src/utils.jl
index 37863b6..057353c 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -128,7 +128,7 @@ function inexpr(ex, x)
   return result
 end
 
-isgensym(s::Symbol) = contains(string(s), "#")
+isgensym(s::Symbol) = occursin("#", string(s))
 isgensym(s) = false
 
 function gensymname(x::Symbol)