diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab7f49d2..4b7e8b1a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,16 +1,20 @@
+## 0.5.10
+ - fix regression for `UInt32`
+ - **Deprecation**: Do not rely on JLD2 to load a compression library. This feature will be removed in a future release. Instead explicitly add `using` statements into your scripts.
+
 ## 0.5.9
  - fix regression for `Union{Bool,Nothing}` array elements (#617)
- - fix printing issue in `printtoc` 
+ - fix printing issue in `printtoc`
 
 ## 0.5.8
  - Stop using `Base.module_keys` as it is removed on nightly
 
 ## 0.5.7
  - Fix edge case for uninitialized Vlens
- 
+
 ## 0.5.6
  - Add Aqua tests and eliminate method ambiguities
- 
+
 ## 0.5.5
  - Experimental support for writing to and reading from `IO` objects e.g. `jldopen(io, "r")`
 
@@ -27,7 +31,7 @@ that may get GC'ed while storing is in progress! (#603)
 
 ## 0.5.1
  - Bugfix and added test for bug introduced in v0.5.0
- 
+
 ## 0.5.0
  - Improved encoding of committed datatypes.
  This fixes longstanding issues but new files will not be loaded correctly with JLD2 versions prior to `v0.5.0`.
@@ -58,7 +62,7 @@ that may get GC'ed while storing is in progress! (#603)
  - fix `Upgrade` for Singleton types
 
 ## 0.4.50
- - Don't hide exception data during loading and saving (#569) 
+ - Don't hide exception data during loading and saving (#569)
 
 ## 0.4.49
  - update compat bounds
@@ -68,7 +72,7 @@ that may get GC'ed while storing is in progress! (#603)
  - fix behaviour for unnormalized strings
  - add missing method for load_attributes
  - clean up `using` statements
- 
+
 ## 0.4.47
  - fix loading structs with more than 256 fields (#558)
 
@@ -107,7 +111,7 @@ that may get GC'ed while storing is in progress! (#603)
  - restrict default Dict encoding to Base implementations
 
 ## 0.4.37
- - Update Dict encoding for latest julia 
+ - Update Dict encoding for latest julia
 
 ## 0.4.36
  - compat bound for TranscodingStreams.jl
@@ -129,22 +133,22 @@ that may get GC'ed while storing is in progress! (#603)
 ## 0.4.31
  - fix UInt32 truncation error for absurdly large array sizes
  - move test-files to a separate repo
- 
+
 ## 0.4.30
  -  allow loading compressed files during precompilation #446 (@marius311)
- 
+
 ## 0.4.29
  - added `Upgrade` feature
- 
+
 ## 0.4.28
  - compatibility to julia v1.9-dev (@eschnett)
- 
+
 ## 0.4.26
  - fix identity relations with custom serialization
 
 ## 0.4.25
  - remove leftover debug statement
- 
+
 ## 0.4.24
  - read-only support for `JLD.jl` files
  - read-only support for many HDF5 files. Most test files of HDF5.jl are covered
@@ -155,14 +159,14 @@ that may get GC'ed while storing is in progress! (#603)
 
 ## 0.4.23
  - Support for `const` fields in mutable structs
- 
+
 ## 0.4.22
  - Fix reconstruction of partially initialized structs
 
 ## 0.4.21
- - Add explicit type mapping 
+ - Add explicit type mapping
 
-## 0.4.20 
+## 0.4.20
  - TTFX improvements
  - Add a comment on jldsave (@BoundaryValueProblems)
 ## 0.4.19
diff --git a/Project.toml b/Project.toml
index a86f6234..548f8296 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "JLD2"
 uuid = "033835bb-8acc-5ee8-8aae-3f567f8a3819"
-version = "0.5.9"
+version = "0.5.10"
 
 [deps]
 FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"
diff --git a/src/data/number_types.jl b/src/data/number_types.jl
index 176c0785..71a80361 100644
--- a/src/data/number_types.jl
+++ b/src/data/number_types.jl
@@ -37,7 +37,7 @@ function jltype(f::JLDFile, dt::FixedPointDatatype)
         elseif dt.size == 1
             return signed ? SameRepr{Int8}() : SameRepr{UInt8}()
         elseif dt.size == 4
-            return signed ? SameRepr{Int32}() : SameRepr{Int32}()
+            return signed ? SameRepr{Int32}() : SameRepr{UInt32}()
         elseif dt.size == 2
             return signed ? SameRepr{Int16}() : SameRepr{UInt16}()
         elseif dt.size == 16
diff --git a/test/loadsave.jl b/test/loadsave.jl
index 5b3decaf..5a3e00f1 100644
--- a/test/loadsave.jl
+++ b/test/loadsave.jl
@@ -847,4 +847,21 @@ end
     loaded_data = load(fn, "data")
     @test !isassigned(loaded_data, 2)
     @test loaded_data[1] == :a
-end
\ No newline at end of file
+end
+
+@testset "Issue #619 - Number type turnaround" begin
+    fn = joinpath(mktempdir(), "number_type_turnaround.jld2")
+    types = [UInt8, Int8, UInt16, Int16, UInt32, Int32, UInt64, Int64, UInt128, Int128, Float16, Float32, Float64]
+    jldopen(fn, "w") do f
+        for t in types
+            f[string(t)] = typemax(t)
+        end
+    end
+    jldopen(fn) do f
+        for t in types
+            v = f[string(t)]
+            @test v isa t
+            @test v == typemax(t)
+        end
+    end
+end
diff --git a/test/runtests.jl b/test/runtests.jl
index 89a11958..df52be7b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,5 +1,6 @@
 using JLD2, FileIO
 using Test
+using CodecZlib, CodecBzip2, CodecZstd, CodecLz4
 
 function better_success(cmd)
     fn1, _ = mktemp()