diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 086ac76..f34b956 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:
diff --git a/Project.toml b/Project.toml
index fd74038..4ffb702 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "WeakRefStrings"
 uuid = "ea10d353-3f73-51f8-a26c-33c1cb351aa5"
 authors = ["quinnj <quinn.jacobd@gmail.com>"]
-version = "1.4.2"
+version = "1.4.3"
 
 [deps]
 DataAPI = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
diff --git a/src/WeakRefStrings.jl b/src/WeakRefStrings.jl
index 12def29..a0571b7 100644
--- a/src/WeakRefStrings.jl
+++ b/src/WeakRefStrings.jl
@@ -58,9 +58,16 @@ function Base.cmp(a::WeakRefString{T}, b::WeakRefString{T}) where T
     return c < 0 ? -1 : c > 0 ? +1 : cmp(al,bl)
 end
 
-function Base.hash(s::WeakRefString{T}, h::UInt) where {T}
-    h += Base.memhash_seed
-    ccall(Base.memhash, UInt, (Ptr{T}, Csize_t, UInt32), s.ptr, s.len, h % UInt32) + h
+if isdefined(Base, :memhash) && isdefined(Base, :memhash_seed)
+    function Base.hash(s::WeakRefString{T}, h::UInt) where {T}
+        h += Base.memhash_seed
+        ccall(Base.memhash, UInt, (Ptr{T}, Csize_t, UInt32), s.ptr, s.len, h % UInt32) + h
+    end
+elseif isdefined(Base, :hash_bytes) && isdefined(Base, :HASH_SECRET)
+    Base.hash(s::WeakRefString{UInt8}, h::UInt) = Base.hash_bytes(s.ptr, s.len, UInt64(h), Base.HASH_SECRET) % UInt
+    Base.hash(s::WeakRefString, h::UInt) = hash(String(s), h)
+else
+    Base.hash(s::WeakRefString, h::UInt) = hash(String(s), h)
 end
 
 function Base.show(io::IO, x::WeakRefString{T}) where {T}
diff --git a/src/poslenstrings.jl b/src/poslenstrings.jl
index a8220c0..afc436e 100644
--- a/src/poslenstrings.jl
+++ b/src/poslenstrings.jl
@@ -94,16 +94,18 @@ function Base.cmp(a::PosLenString, b::PosLenString)
     return cmp(codeunits(a), codeunits(b))
 end
 
-function Base.hash(s::PosLenString, h::UInt)
-    h += Base.memhash_seed
-    if !escaped(s)
-        ccall(Base.memhash, UInt, (Ptr{UInt8}, Csize_t, UInt32), pointer(s), len(s), h % UInt32) + h
-    else
-        # TODO: this is expensive, even for rare escaped PosLenString
-        # this makes it about 4x slower than hash(::String)
-        # alternative is to maybe take what's needed from MurmurHash3.jl to operate by codeunit
-        x = copy(codeunits(s))
-        ccall(Base.memhash, UInt, (Ptr{UInt8}, Csize_t, UInt32), pointer(x), sizeof(x), h % UInt32) + h
+if isdefined(Base, :memhash) && isdefined(Base, :memhash_seed)
+    function Base.hash(s::PosLenString, h::UInt)
+        h += Base.memhash_seed
+        if !escaped(s)
+            ccall(Base.memhash, UInt, (Ptr{UInt8}, Csize_t, UInt32), pointer(s), len(s), h % UInt32) + h
+        else
+            # TODO: this is expensive, even for rare escaped PosLenString
+            # this makes it about 4x slower than hash(::String)
+            # alternative is to maybe take what's needed from MurmurHash3.jl to operate by codeunit
+            x = copy(codeunits(s))
+            ccall(Base.memhash, UInt, (Ptr{UInt8}, Csize_t, UInt32), pointer(x), sizeof(x), h % UInt32) + h
+        end
     end
 end
 
diff --git a/test/runtests.jl b/test/runtests.jl
index abbe0c6..efbc4fe 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -15,6 +15,11 @@ include("poslenstrings.jl")
     @test str[1] === 'h'
     @test str[2] === 'e'
     @test str[3] === 'y'
+    @test hash(str) isa UInt
+    @test hash(str, UInt(0x1234)) isa UInt
+    if !isdefined(Base, :memhash_seed)
+        @test hash(str, UInt(0x1234)) == hash("hey", UInt(0x1234))
+    end
 
     io = IOBuffer()
     show(io, str)
@@ -32,6 +37,11 @@ end
     @test typeof(str) == WeakRefStrings.WeakRefString{UInt16}
     @test String(str) == "hey"
     @test str.len == 3
+    @test hash(str) isa UInt
+    @test hash(str, UInt(0x1234)) isa UInt
+    if !isdefined(Base, :memhash_seed)
+        @test hash(str, UInt(0x1234)) == hash("hey", UInt(0x1234))
+    end
 end
 
 @testset "WeakRefString{UInt32}" begin
@@ -42,6 +52,11 @@ end
     @test typeof(str) == WeakRefStrings.WeakRefString{UInt32}
     @test String(str) == "hey"
     @test str.len == 4
+    @test hash(str) isa UInt
+    @test hash(str, UInt(0x1234)) isa UInt
+    if !isdefined(Base, :memhash_seed)
+        @test hash(str, UInt(0x1234)) == hash("hey", UInt(0x1234))
+    end
 end
 
 @testset "StringVector" begin